Telefonica Brasil S.a.
A maker of mobile and fixed telecom services for everyday Brazilians, Telefónica Brasil runs the country's largest mobile network under the Vivo brand, offering voice and data plans to consumers and businesses. It was born in 1998 when Spanish giant Telefónica bought Telesp, São Paulo's state phone operator, during Brazil's telecom privatization, and later folded the Vivo cell carrier into itself. The Vivo name means "alive" or "lively" in Portuguese, chosen to suggest energy and a living connection to the digital world.
Sponsored American Depositary Receipt (ADR) representing 1 common share
20-F · Fiscal year ended Dec 31, 2025 · SEC filing ↗
The original filing sections are available below.
We are exposed to various market risks as a result of our trading operations, debts obtained to finance our financial derivative activities and instruments, including exchange rate risk, interest rate risk, debt acceleration risk and credit risk. To help us manage our risks, we…
We are exposed to various market risks as a result of our trading operations, debts obtained to finance our financial derivative activities and instruments, including exchange rate risk, interest rate risk, debt acceleration risk and credit risk. To help us manage our risks, we conduct an assessment of our financial assets and liabilities against market values based on available information and appropriate valuation methodologies. However, the interpretation of market information, as well as the selection of methodologies, requires considerable judgment and reasonable estimates to produce adequate values of achievement. As a result, our valuation estimates do not necessarily indicate the values, which will be realized in the current market. The use of different market approaches and/or methodologies for estimates can have a significant effect on the estimated values of achievement. We also enter into derivative instruments to manage the risks to which we are exposed in accordance with our risk management policy. We do not have derivative instruments for speculative purposes. To further assist our risk management, we perform fair value analyses of our derivative financial instruments, as well as sensitivity analyses of our risk variables and our risk of net exposure. For more details on the results of our valuation analysis, risk management strategies and sensitivity analysis of our derivative financial instruments, see note 33 to our audited consolidated financial statements included elsewhere in this annual report. The Company is exposed to exchange rate fluctuations linked to commodity risk arising from the future revenue associated with copper sales, since both the international price of the metal and the quotation of foreign currencies can affect the amount to be received. Adverse movements in these markets may reduce revenue in reais and increase the volatility of results. To mitigate these risks, the Company entered into hedge transactions accounted for through hedge accounting using financial derivatives designed to simultaneously protect the exposure to foreign exchange rates and to copper price risk. These instruments aim to provide greater predictability to the project’s cash flows and minimize the impacts of market fluctuations. See note 32 to our audited consolidated financial statements included elsewhere in this annual report.
Read original filing text →A.[Reserved.] B.Capitalization and Indebtedness Not applicable. C.Reasons for the Offer and Use of Proceeds Not applicable. D.Risk Factors This section is intended to be a summary of more detailed discussions contained elsewhere in this annual report. You should carefully read a…
A.[Reserved.] B.Capitalization and Indebtedness Not applicable. C.Reasons for the Offer and Use of Proceeds Not applicable. D.Risk Factors This section is intended to be a summary of more detailed discussions contained elsewhere in this annual report. You should carefully read and consider the following risks, along with the other information included in this annual report. The risks described below are not the only ones we face. Additional risks that we do not presently consider material, or of which we are not currently aware, may also affect us. Our business, results of operations or financial condition could be impacted if any of these risks materialize and, as a result, the market price of our common shares and our ADSs could be affected. The risks described below are organized by risk category and these categories are not presented in order of importance. However, within each category, the risk factors are presented in descending order of importance, as determined by us as of the date of this annual report. We may change our vision about their relative importance at any time, especially if new internal or external events arise. Summary of Risk Factors Summary of Risks Relating to Financial Matters •The Brazilian government has exercised, and continues to exercise, significant influence over the Brazilian economy. This influence, as well as Brazilian political and economic conditions, could adversely affect us and the trading price of our common shares and ADSs. •Political instability may materially adversely affect the Brazilian economy, our business, and the market price of our common shares and ADSs. •Inflation and government efforts to curb inflation may contribute to economic uncertainty in Brazil, adversely affecting our business and results of operations. •Political, economic and social developments and the perception of risk in other developed and emerging countries may adversely affect the Brazilian economy, our business, and the market price of Brazilian securities, including our common shares and ADSs. 1 Table of Contents •Any downgrading of Brazil’s credit rating could reduce the trading price of our common shares and ADSs. •Changes in taxes and other assessments or changes in the interpretation of tax laws or regulations may adversely affect us and our shareholders. •Fluctuations in exchange rates may adversely affect our ability to meet liabilities denominated or linked to foreign currencies or reduce our income in foreign currency, and may have a material adverse effect on the market value of our common shares and ADSs. •Geopolitical conflicts, instability and related sanctions may have a material adverse effect on the global and Brazilian economies as well as on us. •Potential global or national events related to health, including contagious disease outbreaks, epidemics or pandemics, may significantly affect our operations. •Some of our debt agreements may contain covenants, key performance indicators and targets; as such, any default or failure to reach such targets under such debt agreements may have a material adverse effect on our financial condition and cash flows. Summary of Risks Relating to Operational Matters •Information technology is key to our business and we could be subject to cybersecurity risks. •Companies operating in the telecommunication industry, including us, may be harmed by restrictions regarding the deployment and maintenance of network infrastructure. •Man-made or natural disasters, including extreme weather conditions due to climate change (high temperatures, floods, thunderstorms) or other unexpected events could adversely affect networks, systems, infrastructure and service continuity. •We are subject to environmental laws and regulations. Failure to comply with governmental laws and regulations could subject us to penalties that could have an adverse effect on our business and reputation. Summary of Risks Relating to Our Business and Industry •We are dependent on key personnel and the ability to hire and retain additional personnel. •We are subject to liabilities relating to third-party contractors, which may have a material adverse effect on our business and results of operations. •We make investments based on demand forecasts that may become inaccurate due to economic volatility and may result in revenues that are lower than expected. •Our current radio frequency licenses may not be renewed for additional periods. •Consolidation in the telecommunications market may increase competition in the near future and may change Brazilian market dynamics. •We face significant competition in the Brazilian market. •Extensive government regulation of the telecommunications industry may limit, in some cases, our flexibility in responding to market conditions, competition and changes in our cost structure or impact our fees. •Failure to comply with the conditions set forth in our Self-Composition Agreement may materially and adversely affect our results of operations. •We depend on key suppliers to obtain the necessary equipment and services for our business. 2 Table of Contents •Our operating results may be negatively affected by changes to the rules applicable to STFC and SMP authorizations. •ANATEL has the authority to issue new regulations affecting many of our areas of operations. •The industry in which we conduct our business is continually changing and evolving technologically, which demands adequate changes in the regulatory environment. •We are subject to certain risks related to conditions and obligations imposed by ANATEL for the use of the spectrum needed for the 4G and 5G services we offer. •Our sales could be suspended as a result of issues with the quality of our services. •We are subject to the risk of noncompliance with data privacy and protection laws, which may lead to sanctions, including financial penalties. •Our expansion into new business sectors may expose us to operational and regulatory risks. Summary of Risks Relating to Legal and Compliance Matters •We face risks associated with litigation. •We are exposed to risks in relation to compliance with anti-corruption laws and regulations and economic sanctions programs. •Internet regulation in Brazil is still limited and several legal issues related to the Internet are uncertain. Summary of Risks Relating to the Common Shares and the ADSs •Holders of our ADSs may face difficulties in serving process on or enforcing judgments against us and other persons. •Holders of our ADSs are not entitled to directly attend shareholders’ meetings and may only vote through the depositary. •Holders of our ADSs or common shares might be unable to exercise preemptive rights with respect to the common shares unless there is a current registration statement in effect which covers those rights or unless an exemption from registration applies. •An exchange of ADSs for common shares risks the loss of certain foreign currency remittance and Brazilian tax advantages. •Holders of our common shares will be subject to, and holders of our ADSs could be subject to, Brazilian income tax on capital gains from sales of common shares or ADSs. •Our controlling shareholder has power over the direction of our business. 3 Table of Contents Risks Relating to Financial Matters The Brazilian government has exercised, and continues to exercise, significant influence over the Brazilian economy. This influence, as well as Brazilian political and economic conditions, could adversely affect us and the trading price of our common shares and ADSs. The Brazilian federal government frequently exercises significant influence over the Brazilian economy and occasionally makes significant changes in policy and regulations. The Brazilian government’s actions to control inflation and other policies and regulations have often involved, among other measures, changes in tax policies, wage and price controls, foreign exchange controls, currency devaluations, capital controls and limits on imports. Our financial condition, as well as our business and results of operations and the market price of our common shares and ADSs, may be adversely affected by changes in government policies, especially those related to our sector, such as changes in telephony fees and competitive conditions, as well as general economic factors, including: •exchange rates and currency fluctuations; •inflation; •energy policy; •interest rates and monetary policies; •liquidity of domestic capital and lending markets; •fiscal policies and changes in tax laws; •labor and social security policies, laws and regulations; •exchange controls and restrictions on remittances abroad (including with regards to the payment of dividends); and •other political, diplomatic, social and economic developments in or affecting Brazil. Uncertainty over whether the Brazilian federal government will implement changes to the policies, regulations or standards affecting these or other factors in the future may affect economic performance, which may have an adverse effect on us and the trading price of our common shares and ADSs. Past economic and political instability has led to a negative perception of the Brazilian economy and higher volatility in the Brazilian securities markets, which has adversely affected us and the trading price of our common shares and ADSs. These issues may be exacerbated by the upcoming Brazilian elections and the natural uncertainties as to what policies will be adopted by any new government. We cannot assure the maintenance of policies designed to promote macroeconomic stability, fiscal discipline and domestic and foreign investments, and failure to do so may adversely impact Brazil’s economy, the prices of securities issued by Brazilian issuers such as us and ultimately our business, financial condition and results of operations. Political instability may materially adversely affect the Brazilian economy, our business, and the market price of our common shares and ADSs. Brazil’s political environment has historically influenced and continues to influence the performance of Brazil’s economy, as well as investor and general public confidence, resulting in economic slowdowns and an increase in the volatility of securities issued by Brazilian companies. Governing bodies have the power to determine policies and issue government measures relating to the Brazilian economy and, as a result, affect the operations and financial performance of companies, including us. We cannot predict what policies will be established or whether such policies or changes in existing policies will have an adverse effect on the Brazilian economy or our business, results of operations, financial condition and the market price of our common shares and ADSs. 4 Table of Contents In addition, any changes in the relationship between the Brazilian government and the Brazilian Congress could result in a government impasse and/or political unrest, that could materially adversely affect our operations. Uncertainties about the implementation of changes in monetary, tax and social security laws and policies, may contribute to economic instability. These uncertainties and any new measures may increase volatility in the Brazilian securities market. Inflation and government efforts to curb inflation may contribute to economic uncertainty in Brazil, adversely affecting our business and results of operations. In the past, Brazil has recorded high inflation rates, which, combined with measures taken to fight inflation, has materially adversely affected the Brazilian economy. The COPOM often adjusts interest rates in Brazil in order to achieve the inflation targets established by the National Monetary Council (CMN). The measures taken to curb inflation, such as the increase of interest rates, as well as expectations of any future measures, may have adverse effects on the Brazilian economy, contributing to higher economic uncertainty, reduced economic growth and volatility in the Brazilian capital markets and may adversely affect our business and results of operations. Periods of higher inflation coupled with higher interest rates and other measures to combat inflation may lead to reduced demand for our products. Inflation is also likely to increase some of our costs and expenses, which we may not be able to fully pass on to customers and could adversely affect our operating margins and operating income. In addition, inflation affects our financial liquidity and financial capital resources primarily by exposing us to variations in our floating-rate loans. Rising interest rates may also impact the costs of our fundraising and indebtedness, increasing our financial expenses. Such an increase could adversely affect our ability to pay our obligations to the extent it reduces cash on hand. According to the IPCA index, Brazil’s inflation rates stood at 4.8%, 4.6% and 5.8% in the years ended on December 31, 2024, 2023, and 2022, respectively. In the year ended on December 31, 2025, inflation, as measured by the IPCA, stood at 4.3%, above the target of 3%. Inflation has been driven by factors such as exchange rate fluctuations, amid a tight labor market and solid domestic demand. These elements underscore the persistent challenges in managing price stability in the Brazilian economy. In response to inflationary pressures and macroeconomic volatility, the Central Bank of Brazil has historically implemented monetary policies characterized by elevated interest rates. The Central Bank of Brazil sets the SELIC rate, guiding the broader banking system based on its scenario for inflation, economic growth and other key indicators. In August 2023, the Central Bank started cutting the SELIC rate as a result of a slowdown in inflation and the SELIC rate was set to 10.50% as of May 2024. Nevertheless, renewed inflationary pressures prompted the Central Bank to reverse course and resume hiking rates in September 2024, with the SELIC rate reaching 15.00% by June 2025. In its January 2026 meeting statement, the COPOM indicated that it intends to initiate the loosening of its monetary policy stance in March 2026 if the expected scenario is confirmed, however highlighting that it will keep monetary policy at a contractionary level to ensure convergence to the inflation target. As of the date of this annual report, the SELIC rate stands at 15.00% per annum. Moreover, fixed broadband and mobile service providers, including us, use the IGP-DI to adjust their prices and television and cable service providers use the IGP-M. The IGP-DI and IGP-M are inflation indexes developed by the FGV, a private organization. Since 2006, telephone fees for fixed-line services have been indexed to the IST, as adjusted by a productivity factor, or X Factor, which is defined by ANATEL Resolution No. 507/2008. The IST is an index composed of other domestic price indexes (including the IPCA, IGP-DI and IGP-M, among others) that is intended to reflect the telecommunications industry’s operating costs. As a result, this index serves to reduce potential discrepancies between our industry’s revenue and costs, and thus reduce the apparent adverse effects of inflation on our operations. 5 Table of Contents Political, economic and social developments and the perception of risk in other developed and emerging countries may adversely affect the Brazilian economy, our business, and the market price of Brazilian securities, including our common shares and ADSs. The market for securities issued by Brazilian companies may be influenced, to varying degrees, by economic conditions in both developing and developed economies. The reaction of investors to developments in other countries may have an adverse impact on the market value of securities of Brazilian companies. The prices of shares traded on the B3, for example, have historically been sensitive to fluctuations in interest rates in the United States, as well as variations of the main U.S. stock exchanges. Additionally, crises in other emerging countries or the economic policies of other countries may reduce investor demand for securities of Brazilian companies, including our common shares and ADSs. Any of the foregoing developments may adversely affect the market value of our common shares and ADSs and hinder our ability to access the capital markets and finance our operations in the future on acceptable terms and costs, or at all. To the extent that economic problems in emerging market countries or elsewhere adversely affect Brazil, our business and the market value of our common shares and ADSs could be adversely affected. Furthermore, we cannot assure you that, in the event of adverse developments in emerging market economies, the international capital markets will remain open to Brazilian companies or that the resulting interest rates in such markets will be advantageous to us. Decreased foreign investment in Brazil may negatively affect growth and liquidity in the Brazilian economy, which in turn may have a negative impact on our business. Disruption or volatility in the global financial markets could further increase negative effects on the financial and economic environment in Brazil, which could have a material adverse effect on us. Moreover, in recent periods, the United States has announced and implemented tariff measures affecting imports into the United States, including the imposition of a broadly applicable additional tariff that began being collected in April 2025, and additional duties on certain Brazil-origin articles that were later modified or removed for certain products. We cannot assure you that further tariffs, export controls, sanctions, restrictions on technology or services, or other trade measures will not be adopted, expanded or re-imposed in the future. Increased tariffs and the potential for further trade restrictions may lead to a slowdown in global trade and economic activity, create supply chain disruptions and contribute to increased market volatility and uncertainty. For us, such developments could adversely affect our business and results of operations, including by: (i) adversely affecting the Brazilian economy (including through reduced export activity, currency volatility, inflation and interest rates), which may reduce demand for certain services, increase churn and bad debt expense and constrain consumer and enterprise spending; (ii) increasing the cost of, or disrupting the availability of, network equipment, devices, components, software and services that we procure directly or indirectly through global supply chains (including where suppliers pass through tariff- or compliance-related costs or face restrictions on technology transfers); (iii) increasing our capital expenditure requirements and operating costs, delaying network deployment and modernization, and requiring changes to procurement strategies, suppliers or contractual terms; and (iv) increasing volatility in the market price and liquidity of securities of Brazilian issuers, including our common shares and ADSs. Any downgrading of Brazil’s credit rating could reduce the trading price of our common shares and ADSs. We may be harmed by investors’ perceptions of risks related to Brazil’s sovereign debt credit rating. Brazil’s sovereign credit rating affects the cost and other terms upon which we are able to obtain funding. Rating agencies regularly evaluate Brazil and its sovereign ratings, which are based on a number of factors including macroeconomic trends, fiscal and budgetary conditions, indebtedness metrics and the perspective of changes in any of these factors. 6 Table of Contents Brazil was downgraded to non-investment grade status by S&P in September 2015, by Fitch Ratings in December 2015, and by Moody’s in February 2016. Brazil was further downgraded by S&P in February 2016 and January 2018 and by Fitch in May 2016 and February 2018. As of the date of this annual report, Brazil’s sovereign rating is currently rated by the three major risk rating agencies as follows: BB by S&P and Fitch Ratings and Ba1 by Moody’s—ratings which remain below investment grade. Consequently, the prices of securities issued by Brazilian companies are negatively affected. A possible deceleration of growth rates of the Brazilian economy, among other factors, could lead to ratings downgrades. Any further downgrade of Brazil’s sovereign credit ratings could heighten investors’ perception of risk and, as a result, cause the market price of our common shares and ADSs to decline. Changes in taxes and other assessments or changes in the interpretation of tax laws or regulations may adversely affect us and our shareholders The legislatures and tax authorities in the tax jurisdictions in which we operate regularly enact reforms to the tax and other assessment regimes to which we and our customers are subject. Such reforms include changes in tax rates and, occasionally, enactment of temporary taxes. In addition, the interpretation of tax laws by courts and taxation authorities is constantly evolving. In Brazil, the tax system is highly complex and tax laws and regulations are commonly subject to controversial interpretation by tax authorities. In the event that tax authorities interpret tax laws in a manner that is inconsistent with our interpretations, we may be adversely affected. The effects of these changes and any other changes that result from the enactment of additional tax reforms or changes to the manner in which current tax laws are applied cannot be quantified and there can be no assurance that any such reforms or changes would not have an adverse effect upon our business. For more information, see “Item 4. Information on the Company—B. Business Overview—Significant changes in tax legislation.” Fluctuations in exchange rates may adversely affect our ability to meet liabilities denominated or linked to foreign currencies or reduce our income in foreign currency, and may have a material adverse effect on the market value of our common shares and ADSs. The Brazilian currency has been historically volatile and has been devalued frequently over the past three decades. Throughout this period, the Brazilian government has implemented various economic plans and used various exchange rate policies, including sudden devaluations, periodic mini-devaluations (during which the frequency of adjustments has ranged from daily to monthly), exchange controls, dual exchange rate markets and a floating exchange rate system. Although long-term depreciation of the real is generally linked to the rate of inflation in Brazil, depreciation of the real occurring over shorter periods has resulted in significant variations in the exchange rate between the real, the U.S. dollar and other currencies. The exchange rate between the U.S. dollar and the Brazilian real has experienced significant fluctuations in recent years. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$4.8413 per US$1.00 on December 31, 2023, which reflected a 7.4% appreciation in the real against the U.S. dollar during the year. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$6.1923 per US$1.00 on December 31, 2024, which reflected a 27.9% depreciation in the real against the U.S. dollar during the year. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$5.5084 per US$1.00 on December 31, 2025, which reflected an 11% appreciation in the real against the U.S. dollar during the year, influenced in part by higher Brazilian interest rates relative to the U.S., attracting capital inflows, alongside improving global risk sentiment and solid commodity exports. As of February 23, 2026, the real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$5.17 per US$1.00. There can be no assurance that the real will not again depreciate against the U.S. dollar or other currencies in the future. 7 Table of Contents As of December 31, 2025, 99.8% of our total indebtedness, which includes current and non-current loans and financing, debentures, leases and other creditors of R$ 20.3 billion was denominated in Brazilian reais. In the year ended December 31, 2025, approximately 10.8% of our operating costs and expenses were payable or linked to payment by us in U.S. dollars or Euros. Additionally, in the same year, 99.7% of our revenue was generated in reais, except income derived from hedging transactions, international long-distance interconnection fees and services to customers outside of Brazil. To the extent that the value of the real decreases relative to the U.S. dollar or the Euro, our commitments payable or linked to payment by us in foreign currencies become more expensive. Although our accounts receivable denominated in foreign currencies would also appreciate, the net effect could adversely affect our revenue and expenses. In addition, the IST inflation index does not adequately reflect the true effect of exchange rate fluctuations. Thus, our revenue, when translated to U.S. dollars, does not adequately reflect the true effect of exchange rate fluctuations, which may affect our results of operations. We use derivative instruments to limit our exposure to exchange rate risk. Since September 1999, we have hedged all of our foreign currency-denominated bank debt using swaps and other derivative instruments. Since May 2010, the company began using net balance coverage, which is the hedging of net positions in foreign exchange exposures, or assets (issued invoices) minus liabilities (received invoices) for foreign exchange exposures, substantially reducing our risk to fluctuations in exchange rates. We could still continue to face exchange rate exposure with respect to our planned capital expenditures however, as a small part of our planned capital expenditures are denominated or indexed in foreign currencies (mostly U.S. dollars). We systematically monitor the amounts and time of exposure to exchange rate fluctuations and may hedge positions when deemed appropriate. In addition, in 2025, the Company also became exposed to exchange rate fluctuations and commodity price risk arising from the future revenue associated with copper sales expected through 2029, since both the international price of the metal and the foreign currency exchange rate may affect the amounts to be received. Adverse variations in these markets may reduce revenue in Brazilian reais and increase the volatility of our results. To mitigate these risks, we entered into hedge transactions, accounted for through hedge accounting, with financial derivatives designed to simultaneously protect our exposure to foreign exchange risk and to copper price fluctuations, with the objective of maintaining greater predictability in the project’s cash flows and minimizing the impacts of market volatility. These hedge transactions, accounted for through hedge accounting, are adjusted in line with the dynamics of projected sales and evolving market conditions, ensuring continuous alignment between the protection contracted and the Company’s actual exposure. For more information, please see “Note 32. Financial Instruments and Risk and Capital Management". Geopolitical conflicts, instability and related sanctions may have a material adverse effect on the global and Brazilian economies as well as on us. Geopolitical conflicts, instability and heightened tensions in various regions—including, for example, the war between Russia and Ukraine, conflicts in the Middle East, and heightened tensions in Latin America, including involving Venezuela—have provoked strong reactions from the United States, the UK, the EU and various other countries around the world. While the precise effect of these developments remains uncertain, they have already resulted in significant volatility in financial markets and an increase in energy and commodity prices globally. The potential consequences of these conflicts for us include, without limitation: •The U.S. dollar may appreciate sharply, which could increase the price of goods and services on which we depend for which we are required to pay in U.S. dollars, as well as increase the pressure on our margins and prices generally. •Inflation originating from these conflicts makes it more difficult for us to conduct our financial planning, and increases the capital needed to fund our activities and our credit risk exposure. Measures by the Brazilian government and the Central Bank to contain inflation, such as raising the basic interest rate, could materially impact the cost of debt and third-party capital for our financing and investing activities. 8 Table of Contents •A recession of the Brazilian and/or global economies as a result of the aforementioned developments could also have a material adverse effect on our business. While as of the date of this annual report there have not been any material impacts from these wars on our business, we are continuously monitoring the developments to assess any potential future impacts that may arise as a result of these conflicts. Nonetheless, the adverse effects—global or localized—of these conflicts, and their adverse effects on the wider global economy and market conditions could have a material adverse effect on our business, financial condition and results of operations. Potential global or national events related to health, including contagious disease outbreaks, epidemics or pandemics, may significantly affect our operations. Potential global or national events related to health, including contagious disease outbreaks, epidemics or pandemics, may significantly affect our operations. Such events may cause, among other things, supply chain delays due to issues with factories or logistics; impacts on employees or third-party contractors due to quarantine periods or infection; as well as effects on global economic growth and, therefore, the growth of the national economy, which could have a variety of adverse impacts on supply (paralysis of integrated production chains, freezing of productive resources) and demand (deterioration of confidence and expectations, negative effects on income and wealth) caused by a substantial deterioration in financial markets, unprecedented drops in commodity prices, strong slowdown in business activity or severe transportation restrictions. Some of our debt agreements may contain covenants, key performance indicators and targets; as such, any default or failure to reach such targets under such debt agreements may have a material adverse effect on our financial condition and cash flows. The agreements governing most of our outstanding loans and financing may contain certain standard restrictive covenants, including financial covenants. These agreements can provide an acceleration of the full balance of our obligations in the event of default. In general, such agreements are subject to the acceleration of maturity over: (i) the inclusion in the agreement of our shareholders, bylaws or articles of incorporation or of the companies that control us of conditions that lead to restrictions or loss of ability to pay financial obligations arising from these agreements; or (ii) liquidation, dissolution, insolvency, bankruptcy, judicial or extrajudicial recovery to any creditor or class of creditors. Failure to comply with or fulfill any of these restrictions, covenants, financial metrics or financial tests could result in a default under these agreements, which would have a material adverse effect on our financial condition. Risks Relating to Operational Matters Information technology is key to our business and we could be subject to cybersecurity risks. Information technology is essential for conducting our business and providing our services. Consequently, we are exposed to various operational risks related to cybersecurity, system reliability, and information protection. Despite ongoing efforts to modernize our technological infrastructure and replace legacy systems, we operate in an environment characterized by increasing digitization, interconnectivity, and technological complexity, which may amplify our exposure to cyber threats and operational failures. We may be subject to information security incidents arising from, among other factors, cyberattacks, unauthorized access, the introduction of malicious software, ransomware, system failures, human errors, misuse of credentials, or internal malicious acts. Such incidents can result in the loss, disclosure, corruption, or unavailability of information, including customer data, business partner information, and confidential corporate information, as well as the total or partial disruption of our operations and services. 9 Table of Contents Additionally, our operations rely, in various ways, on third parties, including suppliers, partners, and service providers, as well as cloud computing environments. Vulnerabilities, operational failures, or cybersecurity incidents involving these third parties, even if outside our direct control, can adversely affect our systems, processes, operations, and the continuity of our services. The telecommunications sector, in particular, is subject to an ever-evolving cybersecurity threat landscape, driven, among other factors, by increased digitization, growing dependence on computer networks and cloud services, as well as the use of advanced technologies that may increase the sophistication, scale, and frequency of attacks. The occurrence of significant cybersecurity incidents may result in severe adverse impacts, including, but not limited to, operational disruptions, financial losses, regulatory sanctions, legal obligations, litigation, reputational damage, customer loss, and negative effects on our financial results, cash flows, and competitive position. The management of cybersecurity risks is conducted continuously and is integrated into our corporate governance structure, with involvement from management. However, due to the nature of cyber threats, the complexity of our systems, reliance on third parties, and the ever-evolving nature of attack techniques, we cannot assure that such measures will be sufficient to fully prevent, detect, or mitigate all information security incidents or their impacts. Any significant failure in our controls or processes could adversely affect our operations, financial condition, and results. For more information, please see “Item 4. Company Information—B. Business Overview—Technology." Companies operating in the telecommunication industry, including us, may be harmed by restrictions regarding the deployment and maintenance of network infrastructure. Currently, hundreds of municipal laws in Brazil limit the installation of new antennas for mobile service. This scenario has been a barrier to the expansion of mobile networks. Those laws are meant to regulate issues related to zoning and the alleged effects of the radiation and radio frequencies of the antennas. Antenna installation is limited because of concerns that radio frequency emissions from base stations may cause health problems and other environmental impacts. These concerns could have an adverse effect on the wireless communications industry and, possibly, expose wireless providers, including us, to litigation. The regulations may hinder the expansion of our network should we encounter difficulties in proceeding with the deployment of infrastructure in locations most suitable for signal efficiency or, alternatively, in identifying new sites, which, in turn, may delay expansion and adversely affect the quality of our services. New laws and regulations may also create additional restrictions on our transmission infrastructure, which in turn, could have an adverse effect on our business. In this sense, a new regulation regarding the use of electricity poles infrastructure by telecommunication companies is expected to be published by ANATEL and ANEEL (the national Brazilian electricity regulatory agency) by the end of 2026. The new regulation can set forth changes in pricing and other conditions related to the access and maintenance of telecommunication equipment in light poles that may affect our ability to make use of such infrastructure, deemed vital to our current and future operations. Additionally, health concerns regarding the effects of radio frequency emissions may also discourage the use of mobile telephones and may result in the adoption of new measures by governments or any other regulatory interventions, any of which could materially and adversely affect our business, results of operations and financial condition. 10 Table of Contents Man-made or natural disasters, including extreme weather conditions due to climate change (high temperatures, floods, thunderstorms) or other unexpected events could adversely affect networks, systems, infrastructure and service continuity. Our operations may be suspended or interrupted for an indeterminate period in case of adverse events that are likely to damage our transmission bases. These events include natural disasters, storms, cyclones, climate change-related impacts, environmental events and man-made disasters, including fires, explosions, and geopolitical disruptions, as well as civil unrest or health crises (such as the COVID-19 pandemic), or any other unexpected events. Climate change represents systemic risks that, when realized, can result in socioeconomic, financial and environmental impacts potentially affecting the fulfillment of Telefônica Brasil’s business strategy and objectives. Climate change related risks can be categorized as physical risks (chronic and acute) and transition risks. Physical risks include, the increasing frequency of extreme weather events such as storms, cyclones, heatwaves, and wildfires, which can lead to significant damage to our infrastructure causing failures in our wired and mobile networks. Rising means temperatures could increase our operating costs due to greater refrigeration needs for network equipment. High temperatures can also affect the telecommunication equipment, causing failures, write-offs and early retirement, thereby increasing the risk of severe disruption; therefore, cooling is essential. Transition risks include an increased cost of energy (electricity operating expenses), which stands out for having the most substantial financial impact. This is largely due to our high consumption of electricity (an average of 1,800 GWh per year) and the significant dependence of the Brazilian electricity matrix on hydroelectric power, where prolonged periods of drought can adversely impact energy prices. Although, the telecom sector is not heavily dependent on fossil fuels, it is highly dependent on electricity consumption for its networks, so an increase in electricity prices due to a shortage of natural resources could have a significant impact on our energy related operating expenses. If we are unable to mitigate or prevent any such damage in the event of a natural or man-made disaster and any other unexpected events, the suspension or interruption of our operations could have an adverse effect on the continuity of our operations, our financial results and compliance with applicable regulations. We are subject to environmental laws and regulations. Failure to comply with governmental laws and regulations could subject us to penalties that could have an adverse effect on our business and reputation. Our operations and properties are subject to a wide range of environmental laws and regulations governing, among other aspects, environmental licensing and certifications, protection of flora and fauna, air emissions, waste management and remediation of contaminated areas. Failure by us or our business partners to comply with current and future legal requirements, or to identify and manage new or existing environmental liabilities, could result in substantial costs, including investigation and remediation expenses, indemnification, compensation, conduct adjustments, fines, suspension of activities and other penalties, as well as investments required to upgrade our facilities or modify our processes. In addition, such failures could cause significant damages to the company’s reputation. The identification of presently unknown environmental issues, change in evaluation criteria by regulatory authorities, enactment of more restrictive laws and regulations or other unforeseen events may arise in the future and result in material environmental liabilities and related costs. The occurrence of any of these factors could have a material adverse effect on our business, results of operations, assets and financial condition. 11 Table of Contents Risks Relating to Our Business and Industry We are dependent on key personnel and the ability to hire and retain additional personnel. We believe that our success will depend on the continued services of our senior management team and other key personnel. Our management team is comprised of highly qualified professionals, with extensive experience in the telecommunications industry. The loss of the services of any of our senior management team or other key employees could adversely affect our business, financial condition and results of operations. We also depend on the ability of our senior management and key personnel to work effectively as a team. Our future success also depends on our ability to identify, attract, hire, train, retain and motivate highly skilled technical, managerial, sales and marketing personnel. Competition for such personnel is intense, and we cannot guarantee that we will successfully attract, assimilate or retain a sufficient number of qualified personnel. Failure to retain and attract the necessary technical, managerial, sales and marketing and administrative personnel could adversely affect our business, financial condition and results of operations. We are subject to liabilities relating to third-party contractors, which may have a material adverse effect on our business and results of operations. We are exposed to contingent liabilities resulting from our contracting structure, which includes third-party service providers. Such potential liabilities may involve labor claims by third-party providers that are treated as direct employees as well as joint liability claims relating to wage or overtime pay complaints and workplace injury claims. If a significant portion of these contingent liabilities is decided against us and for which we have not made adequate provisions, our financial condition and results of operation may be adversely affected. Furthermore, if the contracting of third-party services is considered to involve the main activities of the company, it may be characterized as direct employment, which would significantly increase our costs and, as a result, we may be subject to administrative proceedings by the relevant labor regulators and may be required to pay fines to the third-party service providers. We make investments based on demand forecasts that may become inaccurate due to economic volatility and may result in revenues that are lower than expected. We make certain investments, such as the procurement of materials and the development of physical sites, based on our forecasts of the amount of demand that customers will have for our services at a later date (generally several months later). However, any major changes in the Brazilian economic scenario may affect this demand and therefore our forecasts may turn out to be inaccurate. For example, economic crises may restrict credit to the population, and uncertainties related to employment may result in a delay in the decision to acquire new products or services (such as broadband or Pay TV). As a result, it is possible that we may make larger investments based on demand forecasts that were necessary given actual demand at the relevant time, which may directly affect our cash flow. Furthermore, improvements in economic conditions may have the opposite effect. For example, an increase in demand not accompanied by our investment in improved infrastructure may result in a possible loss of opportunity to increase our revenue or result in the degradation of the quality of our services. Our current radio frequency licenses may not be renewed for additional periods. Generally, current spectrum authorizations are valid for 15 years. Although the New General Telecommunications Law admits successive spectrum renewals, we cannot guarantee that our existing licenses will be renewed. According to the New General Telecommunications Law and Decree No. 10,402/2020, ANATEL must consider, in renewal processes, conditions such as efficient spectrum use, competitive aspects, public interest, and the completion of investment commitments. 12 Table of Contents In November 2020, ANATEL decided to renew our current authorizations for the use of radio frequencies in band A (850 MHz) on a primary basis until November 29, 2028. However, the specific conditions for renewal, including those related to economic valuation criteria and associated obligations, were challenged by the affected service providers, including us. Following ANATEL’s rejection of these complaints, the final determination regarding these specific conditions remains pending and will require a decision by the TCU. In April 2023, ANATEL determined that our authorizations in the 900 MHz band would not be extended—except in the state of Minas Gerais, as explained below—on the grounds that efficient use of this spectrum had not been properly demonstrated given the low capacity associated with this band (2.5 + 2.5 MHz), which imposes limitations on its effective use. However, the non-renewal of these 900 MHz licenses does not affect the services currently provided by the Company. Also in April 2023, ANATEL decided to renew our 1,800 MHz licenses until 2032. In August 2023, ANATEL further renewed our 900 MHz and 1,800 MHz licenses in part of the state of Minas Gerais (PGO sector 2) until 2032. It is worth noting that our licenses in the remaining parts of the state of Minas Gerais (PGO sector 3) had already been renewed by ANATEL in April 2020 and are set to expire in 2035. Furthermore, in April 2023, ANATEL decided to renew our current license authorizations for the use of 2,100 MHz radio frequencies until April 2038. As these were first-time renewal requests provided for in the contracts and bidding processes that originally granted these authorizations, TCU’s technical division did not identify evidence of non-rational or inappropriate use of these bands by the Company that would justify denying the extensions. However, they highlighted the need to adapt Article 31 of Resolution No. 757/2022 to align with the new proposed maximum validity terms. On February 3, 2025, Resolution No. 757/2022 was revoked by Resolution No. 773/2025, which approved new Regulation for Radio Frequencies Conditions of Use. On February 5, 2025, TCU approved the renewal of 2,100 MHz authorizations, as originally proposed by ANATEL. This approval was formalized through TCU Ruling No. 224/2025. If the licenses mentioned above are not renewed, we may be required to compete for new licenses in a spectrum auction. The loss or non-renewal of spectrum licenses could significantly impact the coverage of our mobile services, potentially rendering our services unavailable in certain regions. This would be particularly problematic in areas where we fail to renew or secure licenses for ongoing operations. Any of these circumstances could materially and adversely affect our business, financial condition, revenues, results of operations, and future prospects. Consolidation in the telecommunications market may increase competition in the near future and may change Brazilian market dynamics. Mergers and acquisitions may change market dynamics, create competitive pressures, force small competitors to find partners and impact our financial condition; and may require us to adjust our operations, marketing strategies (including promotions), and product portfolio. The entry of a new market participant with significant financial resources or potential changes in strategy by existing telecommunications service providers can change the competitive environment in the Brazilian market. We may be unable to keep pace with these changes, which could affect our ability to compete effectively and have a material adverse effect on our business, financial condition and results of operations. Additional joint ventures, mergers and acquisitions among telecommunications service providers are possible in the future. If such consolidation occurs, it may result in increased competition within our market. We may be unable to adequately respond to pricing pressures resulting from consolidation in our market, adversely affecting our business, financial condition and results of operations. We may also consider engaging in merger or acquisition activity in response to changes in the competitive environment, which could divert resources away from other aspects of our business. 13 Table of Contents We face significant competition in the Brazilian market. Telecommunications operators continued to focus on improving their base of accesses by attracting customers to higher-value products. On the mobile side of the business, market participants mostly sought to sell hybrid plans (planos controle) and pure postpaid plans to consumers to increase overall ARPUs and profitability. On the fixed-line side of the business, we have seen competition both from large and small players to capture customers for fiber connectivity or upgrades for higher internet speeds, mostly driven by increased demand and the increased supply of high-quality broadband given the expansion in the rollout of fiber optic networks. In addition, customers are demanding higher quality services and greater mobile data availability, which require higher investments in the development, modernization, expansion and continuous improvement of the quality of our services and the experience of our customers. As a result, we continue to face significant competition, mainly driven by the following factors: (1) commercial and pricing pressures from new portfolios launched by competitors; (2) increased 4G, 4.5G, 5G and fiber optic network coverage and improved service quality by our competitors; (3) low-cost alternative services, such as voice and text services provided over IPs, and IPTV/VoD services; and (4) favorable market conditions for MVNO operators, which may affect our competitive position in the market. We continuously monitor market conditions to anticipate future competitive challenges and opportunities and analyze how to address them. Nevertheless, our operational results, market position, competitiveness in the market and margins may be adversely affected if we are unable to keep the same pace as our competitors. Extensive government regulation of the telecommunications industry may limit, in some cases, our flexibility in responding to market conditions, competition and changes in our cost structure or impact our fees. Our business is subject to extensive regulation, including any regulatory changes that may occur during the terms of our authorizations to provide telecommunication services in Brazil. ANATEL, the Brazilian telecommunications industry regulator, regulates, among other things: •industry policies and regulations; •licensing (including licensing of spectrum and bidding processes); •fees and tariffs; •competition incentives and restrictions (including our ability to grow by acquiring other telecommunications businesses); •service, technical and quality standards; •consumer rights; •penalties and other sanctions; •interconnection and settlement arrangements; •cybersecurity; and •fraud prevention actions. 14 Table of Contents The Brazilian telecommunications regulatory framework is continuously evolving. The interpretation and enforcement of regulations, the assessment of compliance with regulations and the flexibility of regulatory authorities are all marked by uncertainty. We operate under authorizations from the Brazilian government, and our ability to maintain these authorizations is a precondition to our success. However, because of the changing nature of our regulatory framework, we cannot provide assurances that ANATEL will not adversely modify the terms of our authorizations and/or licenses. According to our operating authorizations and licenses, we must meet specific requirements and maintain minimum quality, coverage and service standards. Our failure to comply with such requirements may result in the imposition of fines, penalties and/or other regulatory responses, including the termination of our operating authorizations. Any partial or total termination of any of our operating authorizations and licenses would have a material adverse effect on our business, financial condition, revenues, results of operations and prospects. In recent years, ANATEL has been reviewing and introducing regulatory changes, especially regarding asymmetric competition measures and interconnection fees charged among local providers of telecommunications services. Asymmetric competition measures can include regulations intended to rebalance markets in which a market participant has distinct market power over other competitors. The adoption of disproportionately asymmetric measures could have a material adverse effect on our business, financial condition, revenues, results of operations and prospects. With respect to interconnection fees, these are part of our revenue and cost bases. Such fees are charged by telecommunications service providers to each other in order to allow interconnected use of each other’s networks. To the extent that changes to the rules governing interconnection fees reduce the amount of fees we can receive, or our ability to collect such fees, our businesses, financial conditions, revenues, results of operations and prospects could be materially adversely affected. Therefore, our business, results of operations, revenues and financial conditions could be negatively affected by the actions of the Brazilian authorities, including, in particular, the following: •the introduction of new or stricter operational and/or service requirements; •the granting of operating authorizations in our areas; •limitations on interconnection fees that we may charge from other telecommunications service providers; •imposition of significant fines or penalties regarding failures to comply with regulatory obligations; and •antitrust limitations imposed by ANATEL and CADE. Failure to comply with the conditions set forth in our Self-Composition Agreement may materially and adversely affect our results of operations Telefónica Brasil currently offers telecommunications services throughout the national territory, including local, international and long-distance STFC, personal mobile service (SMP), multimedia communication broadband services (including the provision of fixed broadband connection) and pay television services, all under the private regime. 15 Table of Contents On December 16, 2024, Telefônica Brasil, ANATEL, the TCU and the Brazilian Ministry of Communications signed an agreement on the terms and conditions for the adaptation of our STFC concession contracts to an authorization instrument (the “Self-Composition Agreement”). The Self-Composition Agreement includes several key conditions that we are required to comply with: (i) Telefônica Brasil is required to make specific investments on terms established under the Self-Composition Agreement; (ii) Telefônica Brasil must maintain the provision of fixed-line telephone services in certain locations without adequate competition, within the concession area until December 31, 2028; (iii) all pending administrative and judicial proceedings related to our concession pending before ANATEL or any courts must be settled, and Telefônica Brasil must withdraw any cases filed against ANATEL; and (iv) Telefônica Brasil must commit to fulfilling public interest pledges for up to 10 years as part of the transition process. On April 11, 2025, Telefônica Brasil signed the unified authorization term with ANATEL that compiled all previous licenses into a single title, thereby finalizing the transaction to the authorization regime. If we are unable to satisfy the conditions of the Self-Composition Agreement on a timely basis, or at all, ANATEL may, as set forth in the agreement’s terms and conditions, apply fines and/or enforce guarantees related to the investments undertaken by Telefônica Brasil. We depend on key suppliers to obtain the necessary equipment and services for our business. We depend on certain key suppliers of equipment and services, especially telecommunications network equipment and handsets, for the execution and development of our business. These suppliers may delay delivery, alter prices and limit supply as a result of problems related to their own businesses, over which we have no control. If these suppliers are not able to deliver equipment and services regularly, we may face problems with the continuity of our business activities, which may have an adverse effect on our business and results of operations. Our results of operations may be negatively affected by changes to the rules applicable to STFC and SMP authorizations. We receive payments for the interconnection of calls in our fixed-line and mobile networks. Interconnection fees were set by ANATEL in March 2023 for both STFC and SMP networks. See “Item 4. Information on the Company—B. Business Overview—Rates, Taxes and Billing—Interconnection fees.” However, we cannot assure that new mobile service plans will not be suspended by ANATEL, that current fixed-line or mobile interconnection fees remain the same, or that future negotiations on fixed-line or mobile interconnection rates will result in favorable terms or rates. If current fixed-line or mobile interconnection fees are canceled, or if fixed-line or mobile interconnection fees in the future are changed, our business, financial condition, revenues, results of operations and prospects may be adversely affected. ANATEL has the authority to issue new regulations affecting many of our areas of operations. ANATEL has the authority to issue new regulations affecting many of our areas of operations. Such new regulations could have an adverse effect on our operating results because: (1) ANATEL could significantly reduce the interconnection fees we are able to charge, thereby reducing our revenues (see “—Our results of operations may be negatively affected by changes to STFC or SMP rules”); (2) ANATEL may allow more favorable conditions for economic groups without significant market power; (3) the granting of new licenses may increase competition in our area from other operators, which could adversely affect our prices and/or market share, thereby reducing our revenues; (4) ANATEL may require that revenue received for the usage of the SMP network must be included in the calculation of renewing licenses costs; and (5) ANATEL’s general plan of updating the regulations targets several areas of vital importance for our business (including both our fixed-line telephony and mobile businesses), which may cause either an increase in operating costs, an increase in competitive pressure, or a decrease in our revenues, among other adverse effects. For a detailed description of the regulations issued by ANATEL and their impact on our business, see “Item 4. Information on the Company—B. Business Overview—Regulation of the Brazilian Telecommunications Industry.” 16 Table of Contents The industry in which we conduct our business is continually changing and evolving technologically, which demands adequate changes in the regulatory environment. The telecommunications industry is subject to rapid and significant technological changes. Our future success depends on our ability to anticipate and adapt in a timely manner to technological changes. We expect that new products and technologies will emerge and that existing products and technologies will be further developed. The advent of new products and technologies could have a variety of consequences. These new products and technologies may reduce the price of our services by providing lower-cost alternatives and the creation of new digital services, such as the example of over-the-top (OTT) service providers that provide voice and messaging services over IP. Also, new products and technologies may become superior to, and render obsolete, the products and services we offer and the technologies we use, thus requiring our constant investment in new technology and innovation. Such new technologies will demand changes in the regulatory environment, challenging both governmental agencies and telecommunication companies. Companies that provide OTT services, which have characteristics similar to telecommunications services, are currently not subject to the same rules as the telecommunications operators. This gap can bring additional challenges to the telecommunications industry, as current developments in the regulatory framework for OTTs are inconsistent and still unclear. We are subject to certain risks related to conditions and obligations imposed by ANATEL for the use of the spectrum needed for the 4G and 5G services we offer. In November 2021, ANATEL held the largest spectrum auction in its history, which included 4G and, for the first time, 5G blocks, with 700MHz, 2.3GHz, 3.5GHz and 26GHz lots. On that occasion, we acquired 3.5GHz and 26GHz national licenses (100MHz and 600MHz bandwidths, respectively). We also won regional 2.3GHz licenses, with 50MHz bandwidth in the southeast region of Brazil (except São Paulo state and PGO Sector 3) and 40MHz bandwidth in São Paulo state and in the north and mid-west regions of Brazil (except PGO Sectors 22 and 25). These acquired licenses, which we purchased for a total of R$4.45 billion, of which R$0.9 billion is related to licenses and the remaining amount is related to the obligation described below. The licenses ensure we have the required spectrum to provide 5G services, and are valid for 20 years (renewable under the then-existing legal conditions at the expiration of this term). ANATEL also set forth obligations to be fulfilled by the winners of the 5G spectrum auction. For the 2.3GHz and 3.5GHz spectrum bands, these obligations include coverage commitments, the deployment of fiber optic backbone networks in locations with little or no connectivity infrastructure, the implementation of the Integrated and Sustainable Amazon Program (Plano Amazônia de Integração e Sustentabilidade), and devising a project for a private communications network reserved for the Brazilian federal government, as well as the funding activities related to the migration of satellite TV services from the C-band to the Ku-band. Winners of the 26GHz spectrum bands, in turn, will have to invest in connectivity projects aimed at selected public schools throughout Brazil. The ambitious targets established by ANATEL for the rapid implementation of networks pose several risks to our ability to comply. These include: (1) potential delays in obtaining licenses for the construction of new sites, which could impede our ability to meet coverage deadlines; (2) challenges with our suppliers’ capacity to deliver the necessary equipment at the required scale and speed, which could also lead to increased equipment costs; and (3) a potential shortage of qualified personnel needed to support the accelerated pace of network implementation. 17 Table of Contents In this context, ANATEL announced in December 2024 that the cleaning of the 3.5GHz band in all 5,570 Brazilian municipalities had been completed, enabling these bands to receive 5G standalone technology 14 months ahead of the original schedule outlined in the obligations from the 5G auction notice. Failure to meet the targets and obligations set forth in the bid documents could result in significant consequences. ANATEL may execute our bank guarantees, impose fines, or even revoke our licenses to operate the frequencies. Additionally, inefficient use of any frequency could lead to the loss of the corresponding usage license. Furthermore, ANATEL may impose new or unforeseen targets, conditions, or obligations on us, which could further strain our resources or impact our operations. Any of these factors, whether delays in meeting targets, financial penalties, loss of licenses, or new regulatory obligations, could have a material adverse effect on our operations, financial condition, and business performance. Our sales could be suspended as a result of issues with the quality of our services. ANATEL and other judicial and administrative agencies have the authority to suspend our sales in an attempt to improve the overall quality of telecommunications services. Sales suspensions are generally applied to the services for which there have been complaints by consumers and the consumer protection agencies. When applied, the suspension is temporary and usually lifted once the company presents an action plan for improvement. In July 2012, ANATEL suspended mobile service sales by our competitors, Oi, Claro and TIM, as a result of a considerable increase in consumer complaints. The suspensions lasted about 20 days and ANATEL requested that all telecommunications companies, including us, present an action and investment plan to improve the mobile network. Although our action plan was approved by ANATEL in September 2012, if a similar increase in customer complaints occurs in the future we may face suspension of one or more of our services until a new plan can be presented to and approved by ANATEL, which may materially affect our business and results of operations. We are subject to the risk of noncompliance with data privacy and protection laws, which may lead to sanctions, including financial penalties. Law No. 13,709/2018, known as the General Personal Data Protection Law (Lei Geral de Proteção de Dados), came into force on September 18, 2020. This comprehensive data protection law establishes general principles and obligations applicable across all economic sectors and contractual relationships. To oversee and enforce its application at the time, the National Data Protection Authority (Autoridade Nacional de Proteção de Dados), or the ANPD, was created and, since 2023, has operated under the administration of the Ministry of Justice. In 2025, following a decree that designated the ANPD as the autonomous administrative authority for the protection of children and adolescents in digital environments, it was transformed into a regulatory agency, which in change granted it greater functional, technical, decision-making, administrative, and financial autonomy, while expanding its supervisory powers. Certain aspects of the LGPD are still subject to further regulation by the ANPD, as outlined in Ordinances No. 11/2021, No. 35/2022, and Resolution No. 23/2024, in accordance with its biennial regulatory schedule. The LGPD sets forth detailed requirements for the collection, use, processing, and storage of personal data across all economic sectors, regardless of whether the data is collected in digital or physical environments. Many of our services and processes rely on the use of personal data, and we are required to ensure compliance with the LGPD in how we collect, store, and manage such data. The administrative sanctions provided under the LGPD (articles 52, 53, and 54) became enforceable on August 1, 2021, pursuant to Law No. 14,010/2020. Additionally, the ANPD has issued 10 regulations to date, including key rules such as the Administrative Sanctions and Dosimetry Regulation (Resolution No. 4/2023), the Security Incident Communication Regulation (Resolution No. 15/2024), and the International Data Transfer and Standard Contractual Clauses Regulation (Resolution No. 19/2024). 18 Table of Contents Given that the ANPD continues to publish resolutions and guidelines throughout the year, there may be potential impacts or a need to adjust our internal data privacy governance workflows and processes. In addition to oversight by the ANPD, other administrative bodies, such as Brazilian National Consumer Secretariat (Secretaria Nacional do Consumidor), or the SENACON, the various state consumer defense and protection departments (órgãos de proteção e defesa do consumidor), or the PROCONs, or the various state and federal public prosecutor’s offices (Ministério Público), may invoke the LGPD in their inquiries. In some cases, these administrative bodies are authorized to apply sanctions. Furthermore, data subjects themselves can initiate individual or collective legal actions alleging noncompliance with the law. In the event of a violation of the LGPD, we may be subject to (1) legal notices and the required adoption of corrective measures, (2) fines of up to 2% of our or our economic group’s revenues up to a limit of R$50.0 million per infraction (which can be cumulative), (3) publication of the infraction following confirmation of its occurrence, (4) the blocking and erasing of personal data involved in the infraction, (5) partial or complete suspension of the infringing processing activities for up to one year and (6) partial or complete prohibition to engage in processing activities. We may be held liable for material, punitive, individual or collective damages to the data subjects due to the processing of their personal data and could be held individually or jointly liable for material, punitive, individual or collective damages caused by us, our subsidiaries, service providers that may process personal data on our behalf or our affiliates due to non-compliance with the obligations set forth by the LGPD and other laws and regulations in force that address data protection, which may adversely affect our reputation and results and, consequently, the value of our shares. Failure or insufficiency to adopt efficient measures to protect personal data or failure to maintain compliance with the LGPD may lead to the application of fines, obligation to disclose relevant incidents to the market, obligation to eliminate personal data from relevant databases and suspension of access to our databases and prohibition of our activities related to the processing of compromised data. We also may be subject to sanctions not related to the supervision of the ANPD, since consumer protection authorities and the Public Prosecutor’s Office have already been active in pursuing data privacy violations even before the LGPD became effective. Accordingly, failure to protect personal data processed by us, or any failure to implement adequate data protection measures in response to applicable legislation, may subject us to additional costs such as the payment of fines and indemnities, implementation of adjustment measures, and loss of business, in addition of civil sanctions, which may adversely affect our reputation and results. In addition, the application of administrative sanctions under other laws dealing with privacy and data protection issues might be possible, such as the Consumer Protection Code and the Brazilian Civil Rights Framework for the Internet. These administrative sanctions may be imposed by other public authorities, such as the Public Prosecutors’ Offices, the National Consumer Secretariat and consumer protection agencies. We may also be subject to liability in the civil sphere for violation of these laws. Sanctions imposed against us by these authorities may also adversely affect our reputation and results and, consequently, the value of our ADSs and common shares. Our expansion into new business sectors may expose us to operational and regulatory risks. As part of our strategy to diversify our business, we have entered and may continue to enter into new business segments such as energy, education, and financial services, each of which is subject to distinct regulatory frameworks and competitive dynamics. See “Item 4. Information on the Company—B. Business Overview.” Entering these markets exposes us to regulatory uncertainties, operational challenges, and potential difficulties in achieving profitability. We may encounter well-established competitors with significant market share, brand recognition, and financial resources, which could make it difficult for us to establish a competitive position or achieve the expected returns on our investments in these new ventures. 19 Table of Contents Additionally, our expansion into regulated industries, including financial services, introduces new legal and compliance obligations. With our recently obtained authorization to operate as a financial institution, we must comply with the regulations and resolutions imposed by the Central Bank of Brazil including capital adequacy requirements, operational risk management, and cybersecurity, fraud prevention, and anti–money laundering (AML). Although we have implemented governance models from day zero, failure to meet these obligations could result in regulatory sanctions, financial penalties, reputational damage, or, in extreme cases, the revocation of our authorization to operate as a financial institution. Furthermore, regulatory and tax regimes in these new business segments may change over time, potentially increasing compliance costs or imposing additional operational restrictions. Any adverse regulatory developments could impact our ability to operate efficiently, limit our growth prospects, or require us to make significant adjustments to our business strategy. If we are unable to successfully navigate these regulatory and competitive challenges, our financial performance and long-term growth could be negatively affected. Risks Relating to Legal and Compliance Matters We face risks associated with litigation. We are party to a number of lawsuits and other proceedings. An adverse outcome in, or any settlement of, these or other lawsuits could result in significant costs to us. In addition, our senior management may be required to devote substantial time to these lawsuits, which they could otherwise devote to our business. See “Item 8. Financial Information—A. Consolidated Statements and Other Financial Information—Legal Proceedings.” We are exposed to risks in relation to compliance with anti-corruption laws and regulations and economic sanctions programs. We are required to comply with anti-corruption laws and regulations in Brazil and in jurisdictions where our securities are traded. In particular, we are subject, in Brazil, to Law No. 12,846/2013, and in the United States, to the U.S. Foreign Corrupt Practices Act of 1977. Additionally, our operations may be subject to, or otherwise affected by, economic sanctions programs and other forms of trade restrictions (hereinafter referred to as sanctions), including those administered by the United States, including the U.S. Treasury Department’s Office of Foreign Assets Control. Although we have internal policies and procedures designed to ensure compliance with such anti-corruption laws and sanctions regulations (to the extent applicable), there can be no assurance that such policies and procedures will be sufficient or that our employees, directors, officers, partners, agents and service providers will not take individual actions in violation of our policies and procedures (or otherwise in violation of the relevant anti-corruption and sanctions laws and regulations) for which we, our subsidiaries or such employees, directors, officers, partners, agents and service providers may be ultimately responsible. Violations of such laws and regulations could lead to sanctions, reputational harm, or other legal consequences that could have a material adverse effect on our business, results of operations and financial condition. 20 Table of Contents Internet regulation in Brazil is still limited and several legal issues related to the Internet are uncertain. In 2014, Brazil enacted a law, which we refer to as the Brazilian Civil Rights Framework for the Internet (Marco Civil da Internet), setting forth principles, guarantees, rights and duties for the use of the Internet in Brazil, including provisions about internet service provider liability, internet user privacy and internet neutrality. In May 2016, further regulations were passed in connection with the referred law. The administrative penalties imposed by the Brazilian Civil Rights Framework for the Internet include notification, fines (up to 10% of the revenues in Brazil of the relevant entity’s economic group in the preceding fiscal year) and suspension or prohibition from engaging in data processing activities. The Brazilian Civil Rights Framework for the Internet also determines joint and several liability between foreign parent companies and local Brazilian subsidiaries for the payment of fines that may be imposed for breach of its provisions. Administrative penalties may be applied cumulatively. Daily fines may be imposed in judicial proceedings, as a way to compel compliance with a Brazilian court order. If for any reason a company fails to comply with the court order, the fine can reach significant amounts. We may be subject to liability under these laws and regulations should we fail to adequately comply with the Brazilian Civil Rights Framework. However, unlike in the United States, little case law exists around the Brazilian Civil Rights Framework for the internet and existing jurisprudence has not been consistent. Legal uncertainty arising from the limited guidance provided by current laws in force allows for different judges or courts to decide very similar claims in different ways and establish contradictory jurisprudence. This legal uncertainty allows for rulings against us and could set adverse precedents, which individually or in the aggregate could seriously harm our business, results of operations and financial condition. In addition, legal uncertainty may harm our customers’ perception and use of our service. Risks Relating to the Common Shares and the ADSs Holders of our ADSs may face difficulties in serving process on or enforcing judgments against us and other persons. We are organized under the laws of Brazil, and all of our executive officers and our independent public accountants reside or are based in Brazil. Also, four of our 12 board members reside or are based in Brazil. Substantially all of our assets are located in Brazil. As a result, it may not be possible for holders of the ADSs to effect service of process upon us or these other persons within the United States or other jurisdictions outside Brazil or to enforce any judgments obtained in the United States or other jurisdictions outside Brazil against us or such other persons. Because judgments of U.S. courts for civil liabilities based upon the U.S. federal securities laws may only be enforced in Brazil if certain conditions are met, holders may face greater difficulties in protecting their interests due to actions by us, our board members or executive officers than would shareholders of a U.S. corporation. Holders of our ADSs are not entitled to directly attend shareholders’ meetings and may only vote through the depositary. Under Brazilian law, only shareholders registered as such in our corporate books may attend shareholders’ meetings. All common shares underlying our ADSs are registered in the name of the depositary. A holder of ADSs, accordingly, is not entitled to directly attend shareholders’ meetings. Holders of our ADSs may exercise their limited voting rights with respect to our common shares represented by the ADSs indirectly, and only in accordance with the deposit agreement relating to the ADSs. There are practical limitations on the ability of ADS holders to exercise their voting rights due to the additional steps involved in communicating with ADS holders. For example, we are required to publish a notice of our shareholders’ meetings in a Brazilian newspaper published in the same city as our headquarters, and the same newspaper's website must provide digital certification for all the documents kept on such website. Holders of our shares can exercise their right to vote at a shareholders’ meeting by attending the meeting in person or voting by proxy and/or remote voting. By contrast, holders of our ADSs will receive notice of a shareholders’ meeting by mail from the ADR depositary following our notice to the ADR depositary requesting the ADR depositary to do so. To exercise their voting rights, ADS holders must instruct the ADR depositary on a timely basis. This voting process will take longer for ADS holders than for direct holders of our shares. 21 Table of Contents We cannot assure you that holders will receive the voting materials in time to ensure that such holders can instruct the depositary to vote the shares underlying their respective ADSs. In addition, the depositary and its agents are not responsible for failing to carry out holder’s voting instructions or for the manner of carrying out your voting instructions. This means that holders may not be able to exercise their right to vote and may have no recourse if our shares held by such holders are not voted as requested. Holders of our ADSs or common shares might be unable to exercise preemptive rights with respect to the common shares unless there is a current registration statement in effect which covers those rights or unless an exemption from registration applies. Under Brazilian law, if we issue new shares for cash as part of a capital increase, we must grant our shareholders the right to purchase a sufficient number of shares to maintain their existing ownership percentage. Rights to purchase shares in these circumstances are known as preemptive rights. Holders of our ADSs or common shares in the United States will not be able to exercise any preemptive rights unless a registration statement under the U.S. Securities Act of 1933, as amended, or the Securities Act, is effective with respect to that future issuance of shares, or an exemption from the registration requirements of the Securities Act is available. We are not obligated to file a registration statement. Unless we file a registration statement or an exemption from registration applies, holders of our ADSs may receive only the net proceeds from the sale of their preemptive rights by the depositary, or if the preemptive rights cannot be sold, they will lapse and they will not receive any value for them. For more information on the exercise of these rights, see “Item 10. Additional Information—B. Memorandum and Articles of Association—Description of our Bylaws—Preemptive Rights.” An exchange of ADSs for common shares risks the loss of certain foreign currency remittance and Brazilian tax advantages. The different forms of foreign portfolio investments in Brazil, including investments via depositary receipts, are regulated by (i) Joint Resolution No. 13/2024, or Resolution No. 13, enacted by the CVM and the Central Bank—which, effective January 1, 2025, revoked the rule that had been in effect for the preceding 10 years (i.e., CMN Resolution No. 4,373/2014)—, and (ii) by Law No. 14,286/2021, which, effective December 31, 2022, significantly amended the prior legislation on the matter (i.e., Law No. 4,131/1962). Resolution No 13/2024 regulates the issuance of depositary receipts in foreign markets in respect of shares of Brazilian issuers. Pursuant to this regulation, the ADSs benefit from a certificate of foreign capital registration, which permits Citibank N.A., as depositary, to convert dividends and other distributions with respect to common shares into foreign currency and to remit these proceeds abroad. Holders of ADSs who exchange their ADSs for common shares will then be entitled to rely on the depositary’s certificate of foreign capital registration for five business days from the date of exchange. Thereafter, if acting as an individual investor, they will not be able to remit non-Brazilian currency abroad unless they obtain their own certificate of foreign capital registration, constituting a Brazilian financial institution as representative, or unless they qualify under the applicable CMN rules, which entitles certain investors to buy and sell shares on Brazilian stock exchanges without obtaining separate certificates of registration. Further rules may be issued by CVM and by the Central Bank to regulate foreign investments in ADSs, including with regard to the exchange of ADSs for common shares and the remittance of funds arising from the sale of these common shares. If holders of ADSs do not qualify under the applicable CMN rules, they will generally be subject to less favorable tax treatment with respect to our common shares. There can be no assurance that the depositary’s certificate of registration or any certificate of foreign capital registration obtained by holders of ADSs will not be affected by future legislative or regulatory changes, or that additional Brazilian law restrictions applicable to their investment in the ADSs may not be imposed in the future. 22 Table of Contents Holders of our common shares will be subject to, and holders of our ADSs could be subject to, Brazilian income tax on capital gains from sales of common shares or ADSs. Law No. 10,833/2003, or Law No. 10,833, provides that gains on the disposition of assets located in Brazil by nonresidents of Brazil, whether to other nonresidents or to Brazilian residents, will be subject to Brazilian taxation. The common shares are expected to be treated as assets located in Brazil for purposes of the law, and gains on the disposition of common shares, even by nonresidents of Brazil, are expected to be subject to Brazilian taxation. Based on the fact that the ADSs are issued and registered abroad, we believe that gains on the disposition of ADSs made outside of Brazil by nonresidents of Brazil to another non-Brazilian resident would not be subject to Brazilian taxation, since they would not fall within the definition of assets located in Brazil for purposes of Law No. 10,833. However, considering the generic and unclear scope of Law No. 10,833 and the absence of judicial/administrative court rulings in respect thereto, we cannot be assured that such an interpretation of this law will prevail in the courts of Brazil. In case of any assessment by the Brazilian tax authorities, the gains arising from the disposal of ADSs made are subject to capital gain tax in Brazil at (i) progressive rates ranging from 15% to 22.5%, or (ii) 25%, if the non-Brazilian holder is located in a tax haven jurisdiction. See “Item 10. Additional Information—E. Taxation—Brazilian Tax Considerations.” Our controlling shareholder has the power to control and direct our business. As of December 31, 2025, Telefónica S.A., our controlling shareholder, together with its affiliates owned, directly and indirectly, approximately 77.1% of our total capital stock. See “Item 7.A. Major Shareholders.” As a result of their share ownership, Telefónica and its affiliates have the power to control us and our controlled subsidiaries and will be able to cast a majority of the votes in our general shareholders meetings.
A.History and Development of the Company General We were incorporated on May 22, 1998, as a corporation (sociedade anônima) organized under the laws of the Federative Republic of Brazil, as a result of the restructuring and privatization of Telecomunicações Brasileiras S.A. and…
A.History and Development of the Company General We were incorporated on May 22, 1998, as a corporation (sociedade anônima) organized under the laws of the Federative Republic of Brazil, as a result of the restructuring and privatization of Telecomunicações Brasileiras S.A. and its operating subsidiaries, or Telebrás, which monopolized the provision of public telecommunications services in virtually all areas of Brazil prior to 1998. We were incorporated under the name Telesp Participações S.A. and after subsequent reorganizations, we were named Telecomunicações de São Paulo S.A. – TELESP. After our merger with Vivo Participações in October 2011, we changed our corporate name to Telefônica Brasil S.A. 23 Table of Contents On September 18, 2014, we entered into a stock purchase agreement with Vivendi S.A. to acquire all of the shares of GVT Participações S.A., or GVT, the controlling shareholder of Global Village Telecom S.A., or Operating GVT, which was approved by our board of directors on the same date. Pursuant to Brazilian law, the transaction required approval by both ANATEL and CADE. On December 22, 2014, ANATEL approved the transaction and imposed certain obligations, that included (1) the maintenance of current GVT services and plans within the same geographic scope in which GVT previously operated, requiring, in addition, that the successor company expand its operations to at least ten new municipalities within three years beginning on January 26, 2015; and (2) the waiver of the STFC license held by GVT within 18 months of ANATEL’s decisions, since the same economic group cannot hold more than one STFC license in the same geographic area. Telefônica has satisfied both obligations. On March 25, 2015, CADE provisionally approved the GVT acquisition, subject to a series of obligations imposed to prevent any undesired concentration effects of the merger. Such obligations require that we: •Maintain, for at least three years, the current geographical coverage for STFC, SCM and SeAC services; •Maintain, for at least three years, the current average broadband speed for GVT’s customers on a nationwide basis. The reference as of December 2014 was 15.1 Mbps; •Maintain, for at least three years, the current average broadband speed for GVT’s customers in São Paulo. The reference as of December 2014 was 18.25 Mbps; and •Do not exchange, directly or indirectly, classified information, strategic or competitively sensitive information with any other company or between management and representative responsible for subsidiaries of Vivendi group, the Telefónica group and the Telecom Italia group related to its operations in the Brazilian market. In November 2015, ANATEL consented to our corporate reorganization involving Telefônica Brasil S.A., GVT Participações S.A. and its subsidiaries. The approval was subject to certain conditions such as the end of overlap licenses of STFC, SCM and SeAC within 18 months and the obligation to present a list of all assets from the companies incorporated in our STFC (Sector 31, Region III) concession area, confirming the absence of reversible assets burdened judicially (by means of a negative certificate), or in case of attachment, present the appropriate requests for replacement. On March 14, 2016, the corporate reorganization was approved by our board of directors and was completed on April 1, 2016, after the approval by an extraordinary shareholders' meeting of the relevant companies. On July 3, 2017, Telefônica Data S.A., or TData, a wholly-owned subsidiary of the Company, acquired all the shares of capital stock of Terra Networks Brasil Ltda., or Terra, from SP Telecom, one of the controlling shareholders of the Company. The purpose of the Terra Networks Transaction was to expand and integrate our offering of digital services, in order to provide additional value to our customer base and TData’s. Effective as from December 1, 2018, TData was merged into the Company as part of a corporate restructuring. See “—Historical Background—Restructuring Involving TData” for more information. In March 2020, the Company expressed interest in acquiring, jointly with TIM S.A. and Claro S.A., part of the UPI mobile assets of Oi S.A., an acquisition that would reach its closing on April 20, 2022. On that date, all the shares of Garliava RJ Infraestrutura e Redes de Telecomunicações S.A. were acquired by the Company. We are registered with the CVM as a publicly held company and our stock is traded on the B3 under the ticker “VIVT3”. We are also registered with the SEC in the United States and our ADSs are traded on the NYSE under the ticker “VIV” (formerly “TSP”). Our headquarters are located at Avenida Engenheiro Luis Carlos Berrini, 1376, 04571-936, São Paulo, SP, Brazil. Our e-mail is [email protected] and our website is https://ri.telefonica.com.br/en. The information on our website is not included or incorporated by reference in this annual report on Form 20-F. As of December 31, 2025, we had 3,195,606,352 outstanding common shares (excluding treasury shares), with no par value per share. As of December 31, 2025, our shareholders’ equity amounted to R$69.0 billion as presented in our audited consolidated financial statements included elsewhere in this annual report. 24 Table of Contents Historical Background Corporate Restructuring Involving the Company and Vivo Participações On July 28, 2010, our parent company, Telefónica, reached an initial agreement with Portugal Telecom for the acquisition of 50% of the share capital of Brasilcel, N.V., or Brasilcel. As a result of this transaction, Telefónica held 100% of Brasilcel’s share capital. At the time, Brasilcel held approximately 60% of Vivo Participações’ share capital. On December 21, 2010, Brasilcel was incorporated into Telefónica. Due to the acquisition of control of Vivo Participações, on February 16, 2011, Telefónica, through its subsidiary SP Telecom, launched a public offer for the common shares of Vivo Participações (its only voting shares) held by minority shareholders. As a result of the public offer, on March 18, 2011, SP Telecom acquired 10,634,722 common shares of Vivo Participações, representing 2.66% of its shares, resulting in the Telefónica group’s participation of 62.1% of Vivo Participações. On December 27, 2010, the boards of Directors of Vivo Participações and Telefônica Brasil approved the terms and conditions of a corporate restructuring, which provided for the merger of the shares issued by Vivo Participações in Telefônica Brasil. The corporate restructuring was approved by ANATEL on March 24, 2011, and on April 27, 2011, the shareholders of Vivo Participações and Telefônica Brasil approved the merger of the shares issued by Vivo Participações in Telefónica. On June 14, 2011, the board of directors of both companies approved a second corporate restructuring, in which Vivo Participações became our wholly-owned subsidiary. The terms and conditions of the second corporate restructuring were unanimously approved by the shareholders of both companies on October 3, 2011. Vivo Participações was incorporated into us, and the holders of Vivo Participações’ merged shares received new shares of the company. Due to the merger of Vivo Participações into us, our capital was increased by R$31.2 billion, reflecting the economic value of the shares issued as a result of the merger. The merger did not change the identity of the controlling shareholders of the companies. In addition, as a result of this merger, on July 6, 2011, Vivo Participações submitted a statement to the SEC to cancel the registration of its American Depositary Shares, or ADS, program, since all its ADSs were converted into ADSs of Telefônica Brasil. The SEC approved the deregistration on July 7, 2011. A third stage of the corporate restructuring was approved by ANATEL on August 16, 2011. On October 3, 2011, our shareholders approved the merger of Vivo Participações in the USA and Telefônica Brasil absorbed the assets of Vivo Participações, extinguishing Vivo Participações, which simplified and further rationalized our cost structures. On the same date, we changed our telecommunications name from Telecomunicações de São Paulo S.A. – TELESP to Telefônica Brasil S.A., to reflect our national operations. On October 18, 2011, ANATEL approved the transfer of the authorization for the provision of SMP services in the state of Minas Gerais from Vivo Participações to Vivo. As a result of this name change, the ticker symbols for our shares were also changed from October 6, 2011 (including), from TLPP3, for common shares, and TLPP4, for preferred shares, to VIVT3 and VIVT4, respectively, with the subsequent change of our trading name to TELEF BRASIL. Our ticker symbol for ADRs on the NYSE was changed to VIV, from TSP. Acquisition of GVT On September 18, 2014, we signed a share purchase agreement with Vivendi and some of its subsidiaries, or collectively, Vivendi, and with GVTPar, Telefónica, S.A. and GVT Operacional, under which we agreed to buy all shares of GVTPar, the controlling shareholder of GVT. This acquisition was approved by our board of directors on September 18, 2014. 25 Table of Contents As consideration for the acquisition, we agreed to pay a portion of the price in cash, and a portion in the form of our common and preferred shares, as follows: (1) €4,663,000,000 to be paid in cash on the closing date, as adjusted under the terms of the share purchase agreement, and (2) our common and preferred shares in the amount of 12% of our total capital after the capital increase contemplated in the share purchase agreement and the merger of GVTPar shares in us. The full consideration was paid upon completion of (A) a capital increase, the proceeds of which were used to pay the cash consideration described in (1) above, and (B) the merger of GVTPar shares in us. On December 22, 2014, ANATEL approved the transaction and imposed certain obligations, which we believe did not compromise the terms of the acquisition of GVT or its value. On March 25, 2015, CADE’s administrative court approved the transaction on the basis of certain confidential commitments offered by us and Vivendi S.A. Commitments include the execution of two merger control agreements: the first between CADE and the second between CADE and Vivendi S.A. On March 25, 2015, our board of directors approved the public offering of shares, including shares in the form of ADSs, in accordance with a capital increase of R$15,812,000,038.03, by issuing 121,711,240 common shares, at the price of R$38.47 and 236,803,588 preferred shares, at the price of R$47.00, as well as 6,282,660 preferred shares according to the exercise of the excessive allotment option. On May 28, 2015, our shareholders approved the ratification of the Share Purchase Agreement and Other Agreements, signed by the Company, as Buyer, and Vivendi S.A. and its subsidiaries, Société d’Investissements et de Gestion 108 SAS and Société d’Investissements et de Gestion 72 S.A., as Sellers, for which all shares issued by GVTPar, a shareholder of Global Village Telecom S.A., were acquired by us. Therefore, as provided for in the share purchase agreement, we paid a portion of GVT’s spot acquisition price with cash, receiving shares of GVTPar and GVT Operator, and another portion in shares, to FrHolding108 as a result of the merger of GVTPar’s shares in us, representing 12% of our share capital after the merger. On June 24, 2015, the transaction for the exchange of shares between Telefónica and Société d’Investissements et de Gestion 108 SAS, a company controlled by Vivendi S.A. was completed, through which FrHolding108 transferred to Telefónica 76,656,559 shares representing 4.5% of our share capital, including 68,597,306 common shares representing 12% of this class of shares and 8,059,253 preferred shares representing 0.72% of this class of shares, in exchange for 1,110,000,000 shares representing 8.2% of the common shares of Telecom Italia, S.p.A., previously held by Telco TE, S.p.A., a subsidiary of Telefónica. On July 29, 2015, Vivendi S.A. sold 67.9 million preferred shares, representing 4% of our share capital. On the same day, Telefónica S.A. announced that it had signed an agreement with Vivendi’s subsidiary, Société d’Investissements et de Gestion 108 SAS, through which Telefónica undertook to deliver 46.0 million of its treasury shares, representing 0.95% of its share capital, in exchange for 58.4 million preferred shares of Telefônica Brasil S.A., (received by Société d’Investissements et de Gestion 108 SAS. in the context of the acquisition of GVT Participações, S.A.). On September 16, 2015, the stock exchange was completed. Consequently, Telefónica S.A.’s interest in the Company increased 5.2% in relation to the total preferred shares of the Company and 3.5% in relation to the company’s total capital. On the other hand, SIG108’s shareholding in the Company was reduced by the same proportion. Therefore, as of that date, SIG108 has no interest in the Company. On March 14, 2016, our board of directors approved a corporate restructuring to simplify our organizational structure. In the previous corporate structure, GVT Participações S.A. (“GVTPart”) was 100% owned by Telefônica Brasil. On the date of the merger, GVT was divided and its net assets were transferred in part to GVTPart and partly to POP. GVT’s share of equity related to assets, rights and obligations related to telecommunications activities was transferred to GVTPart and other installments, related to assets, rights and obligations related to other non-telecommunications activities, were transferred to POP. GVTPart was later merged into Telefônica Brasil. The corporate restructuring did not result in an increase in capital or a change in the company’s shareholders’ participation and was ratified by an extraordinary general meeting on April 1, 2016. 26 Table of Contents Acquisition of Telefônica Transporte e Logística Ltda. by TData On October 28, 2015, TData, as a buyer, and Telefónica Gestión de Servicios Compartidos España S.A., as a seller, signed a Share Purchase agreement that resulted in the acquisition of Telefónica Transporte e Logística Ltda., a Brazilian-based company that, among other activities, provides logistics services. Acquisition of Terra by TData On July 3, 2017, we announced that our wholly-owned subsidiary, TData, acquired all shares in the share capital of Terra Networks Brasil S.A. (“Terra”) from SP Telecom, one of our controlling shareholders (the “Transaction”). Terra is a provider of digital services (own and third-party services of value added (“VAS”) and carrier billing, as well as mobile channels for sales and relationships) and advertising. The goal of the Transaction was to expand and integrate our digital services offering in order to provide additional value to our customer base and TData’s, as well as to provide TData’s service offering to Terra’s customer base and subscribers. In addition, the Transaction aimed to expand TData’s advertising business as a result of Terra’s national operations and expertise. The total price paid by TData as a counterpart for the acquisition of shares issued by Terra was R$ 250 million, paid in a single installment using TData’s cash in hand, without the need for financing. The Transaction was not subject to any regulatory authorizations or approvals by us and was completed on July 3, 2017. Restructuring Involving TData On October 30, 2018, our board of directors approved the terms and conditions of the merger in the Company of its wholly-owned subsidiary TData, as well as the proposal to convene the Company’s extraordinary general meeting for November 30, 2018, to resolve the merger. The merger aimed to standardize the provision of services, as well as simplify the company’s organizational and corporate structure, being approved by the Company’s Extraordinary Shareholders’ Meeting on November 30, 2018, not resulting in an increase in capital or change in the Company’s shareholders’ equity. The merger was completed with operational effect as of December 1, 2018. Restructuring involving Terra and Telefônica Infraestrutura e Segurança Ltda. On September 26, 2019, we announced that our wholly-owned subsidiary, Terra had acquired all shares of Telefónica Infraestrutura e Segurança Ltda., or TIS, Telefónica Ingeniería de Seguridad S.A. and Telefónica Digital España S.L.U. (the “TIS Transaction”). TIS is dedicated to the exploration and provision of services and technology of information security systems, technical support and other services related to infrastructure, technology and information. The objective of the TIS Transaction was to enable Terra, which carries out, among other activities, the development of computer systems, with the objective of expanding consulting and operational assistance, maximizing the commercialization of systems, licenses and applications, enabling the expansion of the portfolio of professional and managed services and the integration of commercial offerings from TIS and Terra, unlocking the generation of added value for the Company’s portfolio of clients such as information technology, security, IoT (Internet of Things) and connectivity activities, all to be provided under common management. The total amount paid for the acquisition of the shares issued by TIS was R$70.84 million, in a single installment, without any financing, using the cash available from Terra. This value was calculated based on the economic value of TIS as of June 30, 2019, according to the cash flow criterion, supported by an evaluation report commissioned by us. The TIS Transaction did not alter our ownership structure or cause any dilution to our shareholders. 27 Table of Contents Launch of Vivo Money Credit Rights Investment Funds (FIDCs) In August 2020, in relation to the launch of our Vivo Money service, we structured a credit rights investment fund, Vivo Money Fundo de Investimento em Direitos Creditórios (the “FIDC”), which was created in the form of a closed company for an indefinite period. FIDC’s objective is to provide its quotaholders with a return on equity on their quotas by investing in the acquisition of (i) eligible credit rights, with supporting documents that meet the eligibility criteria and the conditions of assignment, and (ii) financial assets, observing all the composition and diversification indices of the fund’s portfolio. Eligible credit rights to be acquired by FIDC originate from credit transactions conducted electronically by our customers exclusively through our Vivo Money electronic platform. FIDC began operations on September 14, 2020, issuing 2,000 junior subordinated quotas with an initial unit value of R$1,000. On December 1, 2020, we made a new contribution to FIDC in the amount of R$2 million, with the issuance of over 2,000 junior subordinated quotas with an initial unit value of R$1,000. In 2021 we made a total of nine contributions to the FIDC that totaled R$30 million, totaling 26,009.82 junior subordinated quotas with an initial unit nominal value of R$1,260 which will not have a defined remuneration parameter and are subordinated to senior quotas and subordinated quotas, in this order of priority, for the purpose of amortization and redemption. Residual returns from this FIDC, if any, are paid to us as subordinated shareholders. In 2022 we made 11 contributions to the Vivo Money FIDC, in the total amount of R$137 million, representing 126,340.74 junior subordinated quotas with an initial unit nominal value of R$1,435. On July 31, 2023, we signed an investment commitment in Vivo Money FIDC with Polígono Capital (“Polígono”). Polígono is an independent asset manager founded in February 2023 as a partnership between BTG Pactual Asset Management and Prisma Capital to operate in Brazil’s credit-as-a-service market. Its activities range from contract management and credit policy implementation to portfolio management and debt collection. In 2023, Polígono contributed a total of R$30.0 million to the Vivo Money product. These contributions to Vivo Money’s existing funds (“FIDC I” and “FIDC II” were recognized as financial liabilities. In the same year, Telefônica Brasil S.A. contributed R$42.0 million. For the year ended December 31, 2024, Polígono’s total contributions to Vivo Money amounted to R$38.1 million, while Telefônica Brasil contributed R$0.8 million. For more information, see note 21.c.3.5 to our audited consolidated financial statements included elsewhere in this annual report. On October 11, 2024, FIDC II ceased to exist as it was merged into FIDC I, which operates on personal loans, payroll-deducted loans, FGTS, and Pix installments transferred from the liquidated fund (VIVO PAY II - Pix Installment). Subsequently, on April 29, 2024, “FIDC III” was created to operate the “Parcela Pix” product, with a single investment from Telefônica Brasil of up to R$10.0 million. This fund was terminated on November 6, 2025. On March 11, 2025, at a unitholders’ meeting, the fund’s corporate name was changed from VIVO MONEY III Fundo de Investimento em Direitos Creditórios – Responsabilidade Limitada (FIDC III) to VIVO PAY II Fundo de Investimento em Direitos Creditórios – Responsabilidade Limitada (VIVO PAY II), and the designation of the unit class was amended accordingly to reflect the new name. At the same meeting, unitholders approved the second issuance of junior subordinated units, in a total amount of up to R$ 1,000,000.00, pursuant to the terms and conditions set forth in the applicable supplement. On April 4, 2025, Telefônica Brasil made an additional capital contribution of R$ 0.25 million. Subsequently, the unit holders approved the early liquidation of the fund on August 28, 2025, which was thereafter completed. On November 7, 2025, VIVO PAY III – Fundo de Investimento em Direitos Creditórios, Responsabilidade Limitada (VIVO PAY III) was established with an indefinite term, in accordance with CMN Resolution No. 2,907 of November 29, 2001, CVM Resolution No. 175 of December 23, 2022, as well as other applicable legal and regulatory provisions. This fund has a single class of units, structured as a closed-end class, with limited liability and indefinite duration, governed by CMN Resolution 2,907/01, Annex II of CVM Resolution 175/22, and other relevant regulations. 28 Table of Contents Pursuant to its bylaws, this fund constitutes a pool of resources primarily intended for the acquisition of credit rights and other financial assets, as described in its descriptive annex, in compliance with the investment policy applicable to the class and its specific characteristics. The administrator and the manager approved the issuance of junior subordinated units, through a private placement, up to the total amount of R$ 10.0 million, by means of the subscription of up to 10,000 units, each with a unit value of R$ 1,000.00. The initial contribution made to the fund amounted to R$ 2.0 million. Conversion of Our Preferred Shares into Common Shares At an extraordinary shareholders’ meeting held on October 1, 2020, our shareholders approved, effective as of such date, among other things: (1) the conversion of all of our preferred shares into common shares, at a ratio of one common share for each preferred share, or the “Conversion”; and (2) certain amendments to our by-laws. At a special meeting of holders of our preferred shares, held on that same date, our preferred shareholders ratified the Conversion. After the Conversion, which formally occurred after the market closed on November 20, 2020, our ADRs backed by preferred shares were exchanged for ADRs backed by common shares, and our subscribed and fully-paid share capital was R$63,571,415,865.09 divided into 1,690,984,923 common shares, all with no par value. All of our common shares continued to trade under the ticker symbol “VIVT3” on the B3 (while our ticker symbol “VIVT4,” under which our preferred shares traded on the B3, was suspended on November 23, 2020), and our ADRs backed by common shares began trading on the NYSE under the ticker symbol “VIV.” Restructuring involving the sale of shares of Telefônica Cibersegurança e Tecnologia do Brasil Ltda. to Telefónica Cybersecurity Tech, S.L. On November 1, 2020, our board of directors approved the execution of a quotas purchase and sale agreement, or the “CyberCo Transaction,” pursuant to which we sold a 100% equity interest in our subsidiary Telefônica Cibersegurança e Tecnologia do Brasil Ltda., or CyberCo Brasil, to Telefónica Cybersecurity Tech, S.L., or TTech, an indirect subsidiary of Telefónica, for the total amount of R$116.4 million, supported by an appraisal report commissioned by us. As a preliminary step to the implementation of the CyberCo Transaction, certain assets, contracts, and employees were transferred to CyberCo Brasil, all strictly related to cybersecurity activities. The transaction allowed us, as an exclusive distributor of CyberCo Brasil, to be positioned in the cybersecurity market by expanding our portfolio of products and services. In addition, we benefit from greater competitiveness due to the global scale of our cybersecurity partner. The transaction did not alter our shareholding structure, nor cause any dilution to our shareholders. The CyberCo Transaction was not subject to any regulatory authorizations or other approvals in addition to those obtained from our governance bodies on October 30, 2020 and November 1, 2020. Corporate Reorganization – CyberCo Repurchased by Telefônica Brasil S.A. On December 9, 2025, Telefônica entered into a quota purchase and sale agreement, pursuant to which Telefônica Infraestrutura e Segurança Ltda. (“TIS”), an indirect wholly owned subsidiary of Telefônica, acquired 100% of the equity interest in Telefônica Cibersegurança e Tecnologia do Brasil Ltda. (“CyberCo Brasil”) from Telefónica Cybersecurity & Cloud Tech, S.L. (“TTech”), a company under common control with the Company. All quotas issued by CyberCo Brasil were sold by TTech for a total amount of up to R$ 232 million, with R$ 212 million paid in a single installment on the signing date and up to R$ 20 million as contingent consideration. As a result of the transaction, Telefônica, through TIS, became the indirect owner of 100% of the share capital of CyberCo Brasil. This movement reinforces the Company’s strategic focus on the B2B market, enabling greater integration of its digital, cloud and cybersecurity offerings, optimization of service delivery, acceleration of new product launches and strengthening of commercial execution, while preserving full operational and governance control over its cybersecurity platform in Brazil. 29 Table of Contents Investment by Telefónica Infra, S.L.U. and Caisse de Dépôt et Placement du Québec in FiBrasil Infraestrutura e Fibra Ótica S.A. On July 2, 2021, we executed certain agreements, or the “FiBrasil Transaction,” with Caisse de Dépôt et Placement du Québec, or “CDPQ,” a global investment group, and Telefónica Infra, S.L.U., or "TEF Infra," a wholly-owned Spanish subsidiary of Telefónica, for the construction, development and operation of a neutral and independent optical fiber wholesale network in the Brazilian market, through FiBrasil Infraestrutura e Fibra Ótica S.A., or “FiBrasil”. The operation represented a total investment by CDPQ of up to R$1.8 billion (including payments to us and contributions to FiBrasil) in exchange for a 50% equity interest in FiBrasil’s share capital. TEF Infra acquired a 25% equity interest for the same price, while we held the remaining 25% interest. CDPQ had committed to make additional contributions of approximately R$750 million, of which R$205 million had been paid on closing of the FiBrasil Transaction. These contributions, as well as debt that had been raised (such as FiBrasil’s R$550 million debentures issuance on September 25, 2021), were expected to finance the totality of its business plan. Acquisition of Caisse de Dépôt et Placement du Québec’s Equity Interest in FiBrasil by Telefônica Brasil S.A. On July 10, 2025, Telefônica Brasil S.A. announced that it had entered into an agreement to acquire the entire equity interest held by Caisse de Dépôt et Placement du Québec (“CDPQ”) and Fibre Brasil Participações S.A. ("Fibre") in FiBrasil Infraestrutura e Fibra Óptica S.A., representing 50% of FiBrasil’s total share capital, as well as the subscription warrants previously issued by FiBrasil. At this initial stage, the transaction remained subject to customary conditions precedent and to the receipt of all required regulatory approvals, as stipulated under applicable regulations. Following the completion of all required steps, including review and approval by the relevant regulatory authorities, confirmation of the fulfillment of contractual conditions, and the completion of the applicable corporate procedures, the transaction was finalized on November 12, 2025. Upon closing, Telefônica Brasil increased its ownership in FiBrasil to 75.01% of its total share capital, while Telefónica Infra, S.L.U. remained a shareholder holding the remaining 24.99%. Additionally, the subscription warrants previously issued by FiBrasil were canceled immediately after closing. The final acquisition price, adjusted by the positive variation of the CDI rate, amounted to R$ 858 million. The increased ownership further strengthens the Company’s strategic commitment to expanding neutral fiber‑optic infrastructure in Brazil and reinforces FiBrasil’s position as an independent and competitive wholesale fiber platform. On January 9, 2026, the Company’s General Shareholder’s Meeting, ratified the acquisition, pursuant to the first paragraph of article 256 of the Brasilian Corporations Law. Furthermore, Pursuant to Articles 256, §2, 136, item VI, and 137 of the Brazilian Corporations Law, shareholders of the Company who dissent from the resolutions approving the ratification of the acquisition shall be assured the right to withdraw from the Company upon reimbursement of the value of the shares of which they are proven holders. Sale of shares of Telefônica Cloud e Tecnologia do Brasil S/A to Telefónica Cybersecurity & Cloud Tech, S.L. On August 2, 2021, our board of directors approved the execution of a share purchase and investment agreement, or the “TC&T Transaction, whereby: (i) we sold 20% of our stake in our subsidiary Telefônica Cloud e Tecnologia do Brasil S.A., or CloudCo Brasil, to Telefónica Cybersecurity & Cloud Tech, S.L., or TC&CT, a company indirectly controlled by Telefónica, for R$22.0 million; and (ii) TC&CT acquired 190,000 common shares, without par value, issued by CloudCo Brasil, for a total issuance price of R$76.0 million, of which R$25.0 million was paid on August 2, 2021, and R$51.0 million paid in two installments in January 2022 and 2023. These prices were based on an appraisal report prepared by a specialized, independent appraiser. As a result of the TC&T Transaction, after the transaction, we came to hold 50.01% of CloudCo Brasil’s share capital, while TC&CT came to hold the remaining 49.99% interest. Our relationship with TC&CT with respect to the management of CloudCo Brasil is governed by a shareholders’ agreement, which was also executed on August 2, 2021, as amended. Both the share purchase agreement and the shareholders’ agreement have terms and conditions that are common to this type of transaction. 30 Table of Contents As a preliminary step in the implementation of the TC&T Transaction, certain assets, contracts and employees have been transferred from us and TIS to CloudCo Brasil, all strictly related to cloud computing activities. The TC&T Transaction enabled us, in partnership with TC&CT, to develop a Brazilian company dedicated to cloud computing solutions and services for the B2B segment, improving our market position and product offerings and enabling us to capture significant growth opportunities in this sector. The TC&T Transaction was not subject to any regulatory authorizations or additional approvals, other than those already obtained from our governing bodies, and it did not change our capital structure, nor cause any dilution to our shareholders. Launch of VivaE Joint Venture Following our strategy of expanding our consumer digital services portfolio, we signed in October 2021 a non-binding memorandum of understanding with Ânima Holding S.A. (“Ânima Educação”), to set up a joint venture (“JV” or “VivaE”) in education services. In February 2022, we and Ânima Educação signed an investment agreement for the constitution of the aforementioned JV. Ânima Educação is one of the largest and most innovative ecosystems of private education in Brazil, with an 18-year track record. The JV was investing in an online education platform, which will provide professional learning courses and connect students with potential employers, initially in the areas of Technology, Management, Business, and Tourism. As of December 31, 2022, Telefônica Brasil and Ânima Educação collectively invested an aggregate amount of R$20 million in VivaE. In compliance with the investment targets under the JV, in March 2023, we and Ânima Educação each invested R$3 million in VivaE, totaling a cumulative aggregate investment in VivaE of R$26 million since the JV was formed up to December 31, 2023. In line with the forecast for achieving investment targets, a new contribution of R$3.3 million was made by each shareholder (the Company and Ânima Educação) in December 2024, bringing the total aggregate investment in VivaE to R$33 million. Corporate Reorganization – VivaE and Ada Tech Business Combination On October 6, 2025, Telefônica Brasil S.A. (“Telefônica”) completed the corporate reorganization of its equity interest in Vivae Educação Digital S.A. (“Vivae”), a company jointly held with Ânima Holding S.A. The transaction consisted of the contribution of all Vivae shares held by Telefônica to the Vivo Ventures Private Equity Investment Fund, as partial payment in kind of the quotas previously subscribed by the Company in such fund. Subsequently, in 2025, VivaE entered into a business combination agreement with Ada Tecnologia e Educação S.A. (“Ada”), a company specialized in educational solutions focused on programming and technology training for the B2B segment. The business combination aims to strengthen Vivae’s position in the professional digital education market, expand its portfolio of corporate solutions, and generate operational and commercial synergies. As a result, Vivae became an indirect investment of Telefônica, held through the Vivo Ventures private equity fund, and now includes the strategic participation of Ada. Sale of shares of Telefônica IoT, Big Data e Tecnologia do Brasil S/A to Telefónica IoT & Big Data Tech, S.A. On November 1, 2021, our board of directors approved the execution of a share purchase and investment agreement, or the “TI&BDT Transaction,” whereby: (i) we sold a 0.02% equity interest in our subsidiary Telefônica IoT, Big Data e Tecnologia do Brasil S.A., or “IoTCo Brasil,” to Telefónica IoT & Big Data Tech, S.A., or “TI&BDT,” a company indirectly controlled by Telefónica, for R$19 million; and (ii) TI&BDT acquired 499,800 common shares, without value, of IoTCo Brasil, for a total issuance price of R$94.9 million. These prices were based on an appraisal report prepared by a specialized, independent appraiser. As a result of the TI&BDT Transaction, we own 50.01% of IoTCo Brasil’s share capital, while TI&BDT owns the remaining 49.99% interest. 31 Table of Contents As a preliminary step to the implementation of the TI&BDT Transaction, certain assets, contracts, and employees were transferred from us and TIS to IoTCo Brasil, all of which are strictly related to IoT and big data activities. The TI&BDT Transaction enabled us, in partnership with TI&BDT, to develop a Brazilian company dedicated to IoT and big data services and B2B solutions, improving our market position and product offerings and enabling us to capture significant growth opportunities in this sector. Additionally, the TI&BDT Transaction also ensured that we continue to manage relationships with end customers, as we have also entered into an agreement whereby we will act as IoTCo Brasil’s exclusive sales channel. The TI&BDT Transaction was not subject to any regulatory authorizations or additional approvals, other than those already obtained from our governing bodies, and it did not change our capital structure, nor cause any dilution to our shareholders. Launch of Corporate Venture Capital Fund As approved by the Company’s Board of Directors, on April 11, 2022, the Corporate Venture Capital fund was constituted, together with Telefonica Open Innovation, S.L., as Vivo Ventures Fundo de Investimento em Participações Multiestratégia or “Vivo Ventures” or “FIP”. Through Vivo Ventures, we intend to foster the expansion of our digital ecosystem with the creation of meaningful partnerships with startups, contributing to complementing the value proposition offered to our customers through innovative services and products, leveraging our extensive distribution chain and the potential of the Vivo brand. Vivo Ventures has a total committed capital of R$ 470 million, which will be deployed in fifteen years, as investments in startups in the segments of healthcare, financial services, education, entertainment, smart homes, marketplace, among others. We hold 98% of the subscribed capital of Vivo Ventures and Telefónica Open Innovation holds 2%. Vivo Ventures made its first investment in August 2022, investing the amount of US$3 million in Credit Vista Technologies Limited, the holding company of Credit Vista Tecnologia para Finanças Pessoais EIRELI (“Klavi”). Klavi is a fintech that offers Open Finance solutions through a SaaS platform (Software as a Service), using data intelligence that enables customers to develop financial products and services more quickly and accurately. In December 2022, the FIP carried out its second operation, committing to invest R$10 million in Klubi Participações S.A. (“Klubi”). Klubi is a fintech authorized by the Central Bank to operate as a consortium administrator in Brazil, which currently offers car consortium products and services. In May 2023, the FIP signed its third investment contract in the amount of US$3 million with DGB USA Inc., or Digibee, to acquire a stake in such company. Digibee is a company that provides a low-code iPaas (Integration Platform as a service) enabling simplified and efficient integration between legacy technological systems and new technologies, aligned with the Company's interest in accelerating the time-to-market of its technological development. In May 2024, the FIP closed the acquisition of a shareholding position in the amount of R$25 million worth of stock in Conexa Health LLC, the controlling company of Conexa Saúde Serviços Médicos S.A. Conexa is the largest independent telemedicine platform in Latin America and a digital health ecosystem that connects patients, professionals, businesses, and insurers, using up-to-date technology, with the goal of levelling access to quality health care. Prior to the investment, Conexa announced a merger with Zenklub, a digital service company for emotional health and wellness. In 2024, out of the total committed capital of R$320 million, the FIP received a new share subscription of R$100 million, with 98% subscribed by Telefônica Brasil S.A. and 2% by Telefonica Open Innovation, S.L. The subscribed amount will be disbursed as capital calls are made for new investments in startups. 32 Table of Contents In July 2024, FIP committed to acquiring a minority equity stake in CRMBonus Holding in the amount of R$27.7 million. CRMBonus operates a platform that leverages artificial intelligence to enhance relationships between companies and their customers, promoting the concept of “giftback” in the Brazilian market. Since the beginning of this year, one of CRMBonus’ solutions, Vale Bonus, has been part of the benefits offered by the Company, rewarding customers with digital currency when they recharge or pay their bills on time, thereby contributing to increased customer retention. In November 2024, the FIP acquired a minority stake in AGL Holding, the parent company of Agrolend Sociedade de Crédito Financiamento e Investimento S.A., or Agrolend, in the amount of R$9.0 million. Agrolend is an agricultural fintech that provides credit to small- and medium-sized rural producers in Brazil, financing the development of agricultural production and promoting investment in inputs, equipment, and technology to boost producer productivity and profitability. The fintech grants millions of Brazilian Reais in credit to farmers annually and has the potential to enhance the company’s product offerings for this audience by providing connectivity and solutions for better farm management. In December 2024, Vivo Ventures made a follow-on investment of R$15 million in Klubi, a fintech authorized by the Central Bank of Brazil to operate as a consortium administrator. Klubi specializes in consortia for cars, cell phones, and electronic equipment. This additional investment strengthens Vivo’s presence in the financial solutions sector, complementing its existing services through Vivo Money. Vivo collaborated with Klubi to launch the Compra Programada product, a cell phone consortium offering tailored to meet customer needs. Vivo Ventures initially invested R$10 million in Klubi in December 2022. In December 2024, Vivo Ventures entered into an agreement to consummate an investment via a simple agreement for future equity contract in Lend Holding Ltd., or Lend Tech, in the amount of R$18.2 million. Lend Tech is a financial services company that offers technology solutions for debt collection and uses credit and debit card receivables to execute collections. Closing of the transaction is expected in the first half of 2025 and is subject to customary closing conditions. At the end of 2024, Vivo Ventures had capitalized R$137 million of the total of R$200 million in subscribed share capital, with R$53.9 million yet to be capitalized and R$120 million yet to be subscribed. In 2025, Vivo Ventures made nine investments across strategic areas such as Fintech, Education, Insurtech and Legal, reinforcing its focus on digital platforms with strong potential for operational synergies, distribution leverage, and value creation within Vivo’s ecosystem. In December 2024, Vivo Ventures entered into a commitment of US$2 million with Canary, a leading venture capital manager in Brazil, as part of its funds-of-funds strategy, with the objective of strengthening its presence within the venture capital ecosystem, enhancing long-term relationships with top-tier fund managers and expanding access to high-quality investment opportunities aligned with its strategic priorities. In February 2025, Vivo Ventures completed an equity investment of R$11.6 million in Facio, a fintech specialized in credit origination and automation for financial institutions, offering end-to-end solutions that streamline underwriting, risk assessment and customer onboarding through technology and data-driven processes. The investment supports Facio’s expansion in the Brazilian credit market and aligns with Vivo’s strategy to strengthen its presence in financial services and digital lending solutions. In July 2025, the FIP executed an initial investment of R$1.36 million in Elevify, an edtech focused on upskilling and professional development, offering digital education solutions aimed at improving employability and workforce qualification through scalable online programs. This investment aligns with Vivo Ventures’ interest in education platforms that leverage technology to democratize access to high-quality learning. 33 Table of Contents In September 2025, Vivo Ventures committed R$35.0 million to AsaaS as part of a minority equity acquisition. AsaaS is a fintech that provides an integrated financial management and payments platform for small and medium-sized businesses, enabling billing, collections, payments and financial control through a single digital interface. The company supports SMEs in improving cash flow management and operational efficiency, strengthening Vivo’s positioning in solutions tailored to the SME segment. In October 2025, the FIP acquired a minority stake of R$13.3 million in 180 Seguros, an insurtech that offers embedded insurance solutions through APIs, enabling companies to seamlessly integrate insurance products into their digital journeys. The platform focuses on modular and flexible insurance offerings that enhance customer experience and open new digital distribution channels, in line with Vivo Ventures’ strategy in embedded finance and digital protection solutions. Also in October 2025, Vivo Ventures became a shareholder of Ada Tech through a corporate reorganization and merger involving Vivae — the edtech jointly created by Telefônica Brasil S.A. and Ânima Educação — and Ada Tech. As part of this transaction, the equity interest in Ada Tech previously held by Wayra, together with Telefônica Brasil’s stake in Vivae, was transferred to FIP Vivo Ventures, which now directly holds the participation and remains a shareholder of Ada Tech. Ada Tech is an education technology company focused on training and reskilling professionals in software development, data, artificial intelligence and other high-demand digital skills, combining online learning, hands-on projects, and corporate partnerships. In December 2025, Vivo Ventures also carried out a follow-on investment of R$2.7 million in Facio, further reinforcing its confidence in the company’s execution and growth trajectory. The additional capital is intended to support product development, commercial expansion and the strengthening of its technology platform. In December 2025, the FIP concluded an initial equity allocation of R$1.9 million in Inspira. Inspira is a legaltech that develops digital solutions to increase efficiency and automation in legal operations, supporting law firms and corporate legal departments with tools for process management, analytics and decision-making. Finally, Vivo Ventures also approved an increase in the fund’s committed capital, raising its total size to R$470 million. As part of this expansion, the FIP received a new share subscription of R$150 million, with 98% subscribed by Telefônica Brasil S.A. and 2% by Telefonica Open Innovation, S.L. The subscribed amount will be disbursed through capital calls as new investment opportunities in startups are executed. Acquisition of part of Oi UPI Mobile Assets (Business combination) On April 20, 2022, the closing of the transaction related to the Purchase Agreement for Acquisition of Oi Group's mobile business operations (the “UPI Mobile Assets”) took place, and Telefônica Brasil acquired, on such date, all the shares of Garliava RJ Infraestrutura e Redes de Telecomunicações S.A. (“Garliava”), a special purpose company, to which the mobile assets of Oi Group assigned to Telefônica Brasil had been contributed, in accordance with the segregation plan stated in the Oi Agreement. Thus, Telefônica Brasil acquired Garliava’s shares for the amount of R$5,373.0 million having paid, on such day, the amount of R$4,884.6 million. The remaining amount, equivalent to 10% of the payment made on that date, was withheld and its release was subject to certain ongoing discussions regarding price adjustments, as provided for in the Oi Agreement. Likewise, on such date, Telefônica Brasil: (i) committed to an additional payment of R$110.2 million, subject to the fulfillment of certain targets by Oi, a contingent that was part of the total consideration; (ii) made a payment of termination costs in the amount of R$8.3 million, which was also part of the total consideration. Therefore, the total consideration at the closing date was R$5,491.6 million. The Company also entered into other complementary payment commitments with Oi, as follows: (i) made a payment of R$147.6 million for certain transition services provided by Oi to Garliava; and (ii) entered into a take-or-pay data transmission capacity agreement, with a net present value of R$179.0 million, to be paid monthly during a period of 10 years. 34 Table of Contents In the context of this acquisition, the Company's share of UPI Mobile Assets was: •Clients: approximately 12.5 million clients, or approximately 30% of UPI Mobile Assets’ total customer base as of February 2022, for which the allocation sought to enhance competition among the Brazilian telecom market operators; •Spectrum: 43 MHz as a national weighted average based on population, or approximately 46% of the UPI Mobile Assets’ radio frequencies, with the allocation in strict conformity to the spectrum limits set by ANATEL; and •Infrastructure: agreements for the use of approximately 2,700 mobile access sites, or approximately 19% of the UPI Mobile Assets’ total sites. All commitments assumed were duly submitted to ANATEL and CADE during 2022. Post-Closing Price Adjustment On October 3, 2022, we commenced arbitration proceedings against Oi due to the manifest breach by Oi of certain terms of the Oi Agreement. These proceedings and related disputes between us and Oi were settled upon the execution of an agreement regarding the Post-Closing Price Adjustment (as defined in the Oi Agreement). This settlement was approved by the Market Arbitration Chamber on October 4, 2023. Pursuant to its terms, the final price for the UPI Mobile Assets assigned to us, taking into account the Post-Closing Price Adjustment, was of R$5,128.8 million, of which R$4,884.6 million was paid by us on April 20, 2022. The remaining amount was paid upon completion of the assessment to Oi of half of the Telefônica Retained Value, and we have withdrawn the other half of the Telefônica Retained Value that was deposited with the Market Arbitration Chamber, equal to R$244.2 million as of the closing date, plus interest and/or monetary correction. Post-closing price adjustments occurred during the second half of 2023, after the PPA measurement period. Therefore, the impacts generated by post-closing price adjustments were recorded in the income statement, without changes to goodwill. Merger of Garliava With and Into Telefônica Brasil On February 1, 2023, our shareholders approved Garliava’s merger into Telefônica Brasil, subject to certain conditions. Fulfillment of these conditions was confirmed by our board of directors on February 28, 2023, from when the merger became effective and Garliava was declared extinct. Acquisition of the Vita IT Company through TIS On October 3, 2022, our indirect subsidiary, Telefônica Infraestrutura e Segurança Ltda. (“TIS”), completed the transaction for the acquisition of all shares representing the capital stock of Vita IT Comércio e Serviços de Soluções em TI Ltda. (“Vita IT”), was approved by CADE. The adjusted total purchase consideration transfer was R$110.2 million, of which: R$42.0 million, paid in cash at the time of completion of the Transaction; R$9.0 million paid in 2023 and the balance of R$59.2 million was paid according to contractual clauses, updated by the IPCA. The referred price was also supported by an appraisal report prepared by an independent company. The transaction’s documents contain terms and provisions common to this type of transaction, such as representations and warranties, indemnification, and others. It was preceded by financial, administrative, legal, fiscal and operations diligence in relation to Vita IT. The transaction was part of our strategy to strengthen our operations and positioning in the Networking market, with the supply of network equipment (e.g., switches, routers, and Wi-Fi access points) and implementation, management and technical support for the corporate network companies. Vita IT acted as a solution integrator for companies of different sizes, providing professional and managed Networking services, as well as reselling hardware and software in the same segment. 35 Table of Contents The combination of resources and capacities of TIS and Vita IT generated added value for our client portfolio, thanks to the performance of both companies under the same management in Information Technology and Networking activities. The transaction also enabled new businesses to be leveraged on a larger scale and in a sustainable manner, in addition to enabling revenue growth and improving business margins. The integration plan between Vita IT, TIS and us was designed to preserve its value and give continuity to Vita IT’s business. Merger of Vita IT Within and Into TIS On November 30, 2023, our wholly-owned subsidiary TIS completed the merger of Vita IT, its wholly-owned subsidiary, with and into TIS. The “Vivo Vita” brand continue to exist and be used by TIS without affecting the activities previously performed by Vita IT. This merger strengthened the Company’s position in the networking market and allowed for greater operational efficiency, increased business scale, and standardization in providing certain information technology services. Acquisition of the Vale Saúde Sempre Company through POP On March 3, 2023, POP Internet Ltda. (“POP Internet”), a wholly-owned subsidiary of the Company, concluded the acquisition of all shares issued by Vale Saúde Administradora de Cartões Ltda. (f/k/a Vale Saúde Administradora de Cartões S.A.) (“Vale Saúde Sempre”) pursuant to the “Agreement for the Purchase and Sale of Shares and Other Covenants” (“Acquisition of Vale Saúde”). The total consideration transferred was R$62.0 million, with the payment as follows: R$37.0 million, paid in cash upon conclusion of the Transaction, R$3.0 million paid in 2023 and the balance of R$22.0 million will be paid according to contractual clauses, restated by the DI rate variation. The consummation of the deal was not subject to prior approval by CADE and was also preceded by a financial, administrative, legal, fiscal, operational and technological diligence in relation to Vale Saúde. Vale Saúde Sempre is a startup that acts as a healthcare services marketplace, connecting its customers to a wide medical-hospital network with national coverage, upon payment of a monthly subscription. Its accredited network has a full range of health service providers, and the customer can book medical consults (face-to-face and telemedicine), laboratory tests and surgeries at competitive prices, paid on demand directly to the partners. The Acquisition of Vale Saúde strengthens the Company's positioning as a digital ecosystem, promoting services that are relevant and complementary to its business model. The differentiated assets of the Company, such as its brand, extensive customer base with high payment recurrence, and capillarity of on-site and digital distribution channels, will enable the sustainable scaling of Vale Saúde Sempre’s business in a sustainable manner, expanding the Company's portfolio to new digital services in the healthcare value chain. GUD Comercializadora de Energia S.A. - Joint Venture with Auren Comercializadora de Energia Ltda. On December 18, 2023, the Company and Auren Energia S.A., through its subsidiary Auren Comercializadora de Energia Ltda. (together, “Auren”), entered into an investment contract for the incorporation of a joint venture, of which each shareholder will hold 50%, (the “Auren Joint Venture”). By combining Auren’s know-how in energy generation and commercialization with the Company’s scale, digital penetration and distribution capacity, the joint venture position itself in the free energy market in Brazil. Since January 2024, it is accessible to business customers connected to the high-voltage grid with demand below 500kW. The market for the joint venture is estimated to be over 72 thousand large companies including factories, offices and commercial establishments, in addition to, preparing future operations in the low-voltage and residential segments, in the event of the complete opening of the Brazilian electricity market. 36 Table of Contents The transaction closed on March 15, 2024, with a contribution of R$10.3 million to establish the Auren Joint Venture. By December 2024, the Auren Joint Venture had obtained all necessary licenses and authorizations from the applicable regulatory agencies to develop its business. Acquisition of IPNET Serviços em Nuvem e Desenvolvimento de Sistemas Ltda. and IPNET USA, LLC through Telefônica Cloud e Tecnologia do Brasil S.A. On July 22, 2024, Telefônica Cloud e Tecnologia do Brasil S.A. (“TCloud”), a subsidiary of the Company, entered into a purchase and sale agreement for quotas and other covenants to acquire all quotas issued by IPNET Serviços em Nuvem e Desenvolvimento de Sistemas Ltda. (“IPNET”) and IPNET USA, LLC (“IPNET USA”), for up to R$223.8 million subject to the achievement of operational and financial metrics. This amount includes a non-compete agreement which was recognized separately from the business combination at a fair value of R$27.1 million. The remaining purchase price (R$196.8 million) was allocated to the net assets acquired, excluding the non-compete agreement, which was recognized as an intangible. The total consideration was R$196.7 million with payment as follows: R$32.9 million was paid in cash upon completion of the Transaction and the remaining R$163.8 million will be paid in accordance with contractual clauses, updated by the variation of the IPCA / SELIC rate. IPNET specialized in the reselling of software and systems, as well as providing professional and managed services for adaptation, migration, and related support. With 20 years of experience in the market, the group played a key role in the digital transformation of businesses. On October 1, 2024, TCloud signed the closing agreement, completing the acquisition of all quotas issued by IPNET and IPNET USA. This transaction expanded TCloud’s product portfolio and strengthened its professional and managed services, accelerating its growth. The investment also reinforces the Company’s digital ecosystem in the B2B segment, advancing its portfolio of innovative solutions. Corporate Reorganization Involving IPNET On November 1, 2025, Telefônica Cloud e Tecnologia do Brasil S.A. (“Telefônica Cloud Brasil”), a wholly owned subsidiary of the Company and the direct parent company of IPNET, approved and executed the merger of IPNET into Telefônica Cloud Brasil. As a result of this merger, IPNET was extinguished, and Telefônica Cloud Brasil succeeded all its assets, liabilities, rights and obligations. The merger was conducted as part of an internal corporate and operational reorganization aimed at simplifying structures, reducing costs and enhancing synergies between the two companies. The transaction was executed based on the book value of IPNET’s net assets and did not result in any change to the share capital of Telefônica Cloud Brasil nor to the Company’s ownership interest in that subsidiary. Authorization for the operation of Vivo Pay SCD On September 2, 2024, the Central Bank of Brazil granted the authorization for the operation of Vivo Pay Sociedade de Crédito Direto S.A. (“Vivo Pay SCD”), an entity indirectly controlled by the Company, as a Direct Credit Company, further enhancing Vivo’s Financial Services. This new license will enable end-to-end control of our operations, and enhances our ability to integrate financial services with Vivo’s existing channels, delivering an improved and cohesive user experience. The first new product to be launched under this license is our digital banking account, a cornerstone of our financial strategy. Reverse Stock Split and Stock Split On January 29, 2025, the Company announced that our board of directors approved the convening of an extraordinary shareholders’ meeting, to be held on March 13, 2025, to decide on a proposal to group all of our common shares at a 40:1 ratio, and subsequently split each of our common shares at a 1:80 ratio, without any change to the Company’s capital stock value, but solely to our total number of outstanding shares, with a resulting amendment to our by-laws. This transaction would not result in a change to our total amount of outstanding ADSs. 37 Table of Contents The transaction provided greater liquidity to the shares issued by the Company and, consequently, improved the pricing formation process by increasing the volume of outstanding shares effectively negotiated and adjusting its price. In addition, the purposes of this transaction includes the following: (i) reduce operational and administrative costs resulting from the current configuration of our shareholder base; (ii) provide greater efficiency in managing its shareholder base; (iii) improve the efficiency of book-entry share registration and custody systems, (iv) enhance the provision of information and communication, improving the service to shareholders, and (v) provide greater efficiency in distributing proceeds to the Company's shareholders. On March 13, 2025, the extraordinary shareholders’ meeting approved the transaction in full, including the reserve stock split followed by stock split, as well as the adjustment so that each ADR would represent two common shares. The transaction was implemented on April 15, 2025, and remaining fractional shares were grouped and subsequently sold in an auction held at B3 on May 19, 2025, with the net proceeds distributed proportionally to the shareholders entitled to such fractions. Following the Free Position Adjustment Period, on April 15, 2025, the Transaction was finalized before B3 S.A. - Brasil, Bolsa, Balcão (“B3”), with shareholders having their shareholdings adjusted and the Company's shares being traded ex-share consolidation and ex-share split conditions. The auction for the sale of the remaining fractional shares resulting from the Transaction was held at B3 on May 19, 2025. The net proceeds obtained from the sale of these shares were allocated and distributed proportionally among all holders of fractional shares as follows: (i) for shareholders with complete registration data, the amounts were deposited into the current account indicated in the respective shareholder's registration; (ii) for shareholders with shares deposited at the B3 Central Depository, the amounts were credited directly to the Central Depository, which was responsible for transferring them to the respective shareholder through its custodian agent; and (iii) for other unidentified shareholders or those without complete registration data, the amounts are available at the Company, for the legal period, for receipt by the respective holder upon provision of complete registration data. Acquisition of Samauma Brands (i2GO) On March 18, 2025, the Company’s wholly owned subsidiary, Terra Networks Brasil Ltda., entered into a Quota Purchase and Sale Agreement to acquire all quotas of Samauma Brands Comércio, Importação e Exportação de Eletro‑Eletrônicos Ltda., owner of the i2GO brand, for an adjusted amount of up to R$66 million, subject to the achievement of agreed operational and financial metrics. This transaction is aligned with the Company’s strategy to strengthen its presence in the smartphone and electronic accessories market, in which it already operates through its OVVI brand, enhancing its ability to offer high‑quality products that meet the evolving needs of the market. On March 21, 2025, after all conditions were satisfied, the acquisition was concluded through the execution of the Closing Agreement, thereby consolidating Samauma’s integration into the Company’s business portfolio. Following the closing of the transaction, the OVVI and i2GO brands will coexist in a complementary manner, broadening the Company’s product portfolio and strengthening its competitive positioning in the national electronic accessories market. 38 Table of Contents Capital Expenditures The following table sets forth our capital expenditures for each year in the three years ended December 31, 2025. Year ended December 31, 2025 2024 2023 (in millions of reais) Network 7,830.6 7,801.6 7,588.3 Technology / Information Systems 1,126.2 1,055.1 1,015.4 Others(1) 313.5 333.6 419.1 Total capital expenditures 9,270.3 9,190.4 9,022,9 (1)Consists primarily of: (i) handset sales made to corporate customers for the length of their contracts; (ii) furniture and fixtures, office equipment and store layouts; and (iii) spectrum licensing costs relative to the renewal of our 850 / 900 / 1800 MHz frequency. To meet the needs of an increasingly data-driven and connected society, significant investments were made to support the strong growth of data usage in our fiber and mobile network, and 5G coverage in order to meet the legal obligations of the auction, and provide our clients with a better user experience. We continue to invest in expanding our national data transmission backbone to meet the increase in data traffic throughout Brazil. Year Ended December 31, 2025 In 2025, we invested R$9,270.3 million, a 1% increase over the amount we invested in 2024 (R$9,190.4 million), primarily due to an increase of our investments in FTTH. Investments were strongly focused on network projects (which accounted for 84% of investments in 2025), including 4G and 5G mobile access, backhaul transmission, backbone and FTTH expansion. These investments helped sustain our commercial and revenue growth while maintaining the quality of the services provided and preparing us for medium-term growth. Year Ended December 31, 2024 In 2024, we invested R$9,190.4 million, a 2% increase over the amount we invested in 2023 (R$9,022.9 million), primarily due to the increase on investments in the 5G network. Investments were strongly focused on network projects (which accounted 85% of investments in 2024), including 4G and 5G mobile access, backhaul transmission, backbone and FTTH expansion. The investments helped sustain our commercial and revenue growth, while maintaining the quality of the services provided and preparing us for medium-term growth. B.Business Overview We are the leading mobile telecommunications company in Brazil (with a 38.1% market share as of December 31, 2025, based on accesses), with a particularly strong position in postpaid mobile services (40.3% market share as of December 31, 2025, based on accesses). As of December 31, 2025, we reached 18.5% of total market share in FTTH (fiber-to-the-home) accesses in Brazil. Our Vivo brand, under which we market our services, is among the most recognized brands in Brazil. The quality of our services and the strength of our brand recognition enable us to sustain this market leadership. We offer our clients a complete portfolio of products, including mobile and fixed-line voice, mobile data, fixed broadband, ultra-fast broadband, or UBB (based on our FTTH and FTTC infrastructure), Pay TV, information technology and digital services (such as entertainment, cloud, security and financial services). We also have one of the most extensive distribution networks in the sector, where our clients can obtain certain services, such as purchasing credit for prepaid phones. 39 Table of Contents We seek to continue to increase our operating margins by focusing on developing and growing our product offerings so that they comprise an integrated portfolio that allows us to extend our customers' lifetime value. Our Operations and Services Our operations consist of: •local and long distance fixed-line telephone services; •mobile services, including value-added services; •data services, including broadband services and mobile data services; •Pay TV services mainly through IPTV; •network services, including rental of facilities, as well as other services; •wholesale services, including interconnection; •digital services; •services designed specifically for corporate customers; and •the sale of wireless devices, accessories and consumer electronics. Fixed-line voice services Our portfolio of fixed-line telephone services, or STFC services, includes local, domestic long-distance and international long-distance calls. Local services Fixed-line local services include activation, monthly subscription, public telephones and measured services. Measured services include all calls that originate and terminate within the same area code within our concession region, which we refer to as local calls. Intraregional, interregional and international long-distance services Intraregional long-distance fixed-line services consist of all calls that originate in one local area or municipality and terminate in another local area or municipality within our authorization region. Interregional long-distance services consist of state-to-state calls within Brazil and international long-distance services consist of calls between a phone line in Brazil and a phone line outside Brazil. We were the first telecommunications company to be granted the authorization to develop local, intraregional, interregional and international services throughout Brazil. Mobile services According to data regarding market share published by ANATEL in December 2025, we are the leading provider of mobile telecommunications services in Brazil in terms of accesses. Our mobile portfolio includes voice and broadband internet access through 3G, 4G, 4.5G and 5G, as well as value-added services (such as Atma, VivaE, Vale Saúde, Vivo HomeFix, Vivo BTFIT, Go Read, Ubook, Hube Jornais, NBA, McAfee, Forbes Brasil, Casa do Saber, Super Comics, Skeelo, Babbel, and Vivo Pay), prepaid plans with data sharing features, family plans, voice mail, caller identification, voice minutes in unlimited bundles to mobile and fixed-line phones, and digital services such as multi-media backup, cloud-based services to save texts, entertainment and music apps, advertising platforms, among others. 40 Table of Contents We also offer wireless roaming services through agreements with local mobile service providers throughout Brazil and other countries, allowing our subscribers to make and receive calls while outside of our concession areas. We provide reciprocal roaming rights to the customers of the mobile service providers with which we have such agreements. Data services We provide fixed broadband through fiber (i.e., FTTH and FTTC) and xDSL technologies, with download speeds reaching up to 10 Gbps. In 2025, we continued to cover 100% of the municipalities in our concession area in the state of São Paulo and hundreds of others throughout Brazil, reaching approximately 7.8 million fixed broadband customers in total, and we expanded our national fiber network to reach approximately 31.9 million homes, of which 31.0 million consisted of FTTH technology. In mobile broadband, we use a variety of technologies to provide wireless internet services to our customers. As of December 31, 2025, we covered 4,949 municipalities with our 3G network, reaching 97.5% of Brazil’s population. We also offer 4G LTE technology, which, by the end of 2025, was available in 4,901 municipalities, reaching 97.0% of Brazil’s population, 4.5G LTE through carrier aggregation in 4,141 municipalities, reaching 93.3% of the Brazilian population, and also 5G technology, present in 716 municipalities, equivalent to 67.7% of the Brazilian population. Pay TV services We began offering subscription-based television services, or Pay TV services, via DTH (“direct to home,” a type of service that uses satellites for the direct distribution of television and audio signals to subscribers) on August 12, 2007. By the end of 2022, we discontinued the DTH operations, disconnecting all customers. From 2023 onwards, we only provide Pay TV services by means of IPTV (a type of service that offers video broadcast through the IPs) technology. As of December 31, 2025, we had approximately 733,292 Pay TV customers. Network services Our service & network management technology ensures comprehensive management and supervision of all our network processes and network performance for our clients. Our network management center monitors the critical network operational parameters of the countrywide transmission backbone, IP networks, mobile and fixed packet/circuit core networks, value-added services/multimedia platform and global services, radio access network, infrastructure and online services performance, as well fixed access network across the country, broadband networks, network interconnection, portability and IPTV/DTH. Our service management center monitors customer experience and service quality across all platforms, allowing real-time data analysis with advanced analytics and proactive monitoring tools. We believe that this initiative represents a significant step forward in our commitment to delivering exceptional quality of mobile services, with enhanced customer experience, proactive service quality management, data-driven decisions and higher operational efficiency. The center is able to identify abnormalities in both our network (fixed and mobile) and in third-party networks including networks of other operators and other corporate clients, using failure, signaling, quality and service monitoring systems. Our service & network management center is integrated with maintenance and operations teams that maintain and operate mobile and fixed network elements, as well as infrastructure and transmission, in addition to the radio network elements and computing bases, service platforms and communications backbones. Our network provides for continuity of service to our customers in the event of network interruptions. We have developed contingency plans for potential catastrophes in our switchboard centers, power supply interruptions and security breaches. 41 Table of Contents We continuously aim to consolidate our network and increase its offerings, to deliver the best possible service to our customers and to meet their expectations. We are incessantly improving and refining our observability main process, with higher effectiveness of incident correlation, faster fault recovery and proactive incident management. These objectives have been driven by the self-monitoring capabilities with the development of a customized Telefonica Event Management System (TEMS), as well as by the self-healing capabilities with the development of integrated-system enablers (PUR) and the evolution of Robotic Process Automations (RPA). This advancement gives our team more efficiency and speed in detecting and solving problems in our networks. Some of the improvements we have implemented in recent years include advancements in migrating from time-division multiplex switches to next-generation network switches, which offer new digital services to our customers and reduce our maintenance costs, including improvements in security levels, power supply, batteries, and air conditioning infrastructure. In addition, we are widely applying advanced virtualization solutions (net functions virtualization, or NFV) with the purpose of supporting the launch of the brand-new fifth-generation mobile network (5G-NSA/SA), which is fully operating and prepared to address future market and customer expectations by providing massive device connectivity, ultra-high-density deployments (through IoT technology), ultra-low latency applications and higher data transfer rates. Network and facilities We provide services referred to as the industrial exploration of dedicated line (Exploração Industrial de Linha Dedicada), or EILD, pursuant to our authorizations. The EILD consists of the rental of dedicated circuits and clean channel protocols to provide services to third parties. In addition, we are able to offer a complete portfolio of wholesale products, including L2L, IP, Ethernet and MPLS. All of these products are used to meet the demands of other network operators and regional internet providers. The circuits are requested with different service level agreements, and we are required to provide the facilities with contingency routes, sites and equipment to improve the service against points of failure. Our network consists of an access layer that connects our clients through our copper or optical networks, which are connected to voice and data centers. These centers are interconnected locally or remotely through transmission equipment connected predominantly with fiber optics and occasionally through a microwave network, which together form a network layer that enables connectivity between the various platforms as well as interconnection with other carriers. Our network strategy is based on the expansion of the fiber optic access network to allow greater coverage and broadband services for our customers, as well as to develop an integrated multiservice network and multimedia applications. As a telecommunication service provider, we do not manufacture equipment for the construction of our networks and facilities. We buy the equipment from qualified suppliers in Brazil and abroad and through such equipment, we implement our networks and facilities through which we supply our services. Wholesale services (including interconnection) We have continuously adapted and expanded our network topology aiming to develop new business opportunities throughout Brazil by offering services to other telecommunications companies. The result has been a significant increase in the number of providers that use our wholesale services. As part of our wholesale services, we provide interconnection services to other network providers. We earn revenue from any call that originates from another mobile or fixed-line service provider network connecting to one of our customers. We charge the service provider from whose network the call originates an interconnection fee for every minute that our network is used in connection with the call. See “—Operating Agreements—Interconnection Agreements.” 42 Table of Contents As of December 31, 2025, we had 1,007 local and long-distance interconnection agreements with Telefônica Brasil (fixed-line and mobile operation) and 267 agreements for the provision of local and long-distance traffic. An interconnection is a link between compatible telecommunications networks that enables a fixed-line or mobile service user of one network can adequately communicate with the users of a network from another provider. All providers of telecommunication services (fixed or mobile) are required to provide interconnection upon request to any other telecommunication collective service provider. The conditions for interconnection agreements may be freely negotiated among the parties. The agreements are required to be formalized by contract, whose effectiveness depends on ANATEL’s approval. If any given agreement is contrary to the principles of free competition or conflicts with other regulations, ANATEL may reject it. If the parties cannot reach an agreement on the terms of interconnection, including the interconnection fee, ANATEL may determine those terms and conditions by arbitration. Digital services (including value-added services) Overview In 2025, Vivo reached the milestone of 4.1 million OTTs subscriptions, reflecting continuous and consistent growth year after year. The focus on digital video and music services has solidified, with the launch of key players such as Apple Music, YouTube and Netflix. Vivo TV App, is also a strategic app for Vivo as it is owned by the company. This helps to consolidate the company’s position as a digital services provider and contributes to healthy growth. Digital channels played a crucial role in this success, accounting for 75% of sales participation, representing a growth of 10p.p. year over year. This not only reduced costs but also enabled a more efficient operation, achieving significant sales records. The revitalization of sales checkout at App Vivo was a highlight, significantly contributing to business acceleration by providing a simpler, fully digital Journey to buy digital services. Furthermore, Vivo continues to pursue a strategy of offering better cost-benefit solutions to customers. Throughout the year, service bundles with attractive pricing were created, enhancing the perceived value of our products and generating competitiveness. The launch of Vivo Total with digital services, is a significant achievement that reinforces our commitment to creating a comprehensive value proposition that addresses customer’s needs. Financial services Financial services remain a strategic pillar for Vivo, consolidating our evolution into a broad digital services ecosystem and expanding our relevance beyond connectivity. In 2024, we advanced this strategy by consolidating all financial solutions under the Vivo Pay brand, now fully integrated into the Vivo App and visible to more than 28 million users, as of December 31, 2025. Our entry into financial services began in 2020 with the launch of personal loans. Since then, the product has matured significantly. Today, Vivo Pay Personal Loan—formerly Vivo Money—offers credit between R$500 and R$50,000, with terms of up to 36 months and pricing adapted to each customer’s profile. Supported by advanced data analytics, our credit model enhances assertiveness and helps reduce risk. As of December 2025, since the launch, personal loans have reached R$1.1 billion in total disbursements, growing 33% YoY, and the credit portfolio reached R$321 million, excluding loans over 360 days past due. Our nonperforming loans due over 90 days stood at 28.4%, as of December 31, 2025, reflecting stable performance in unsecured credit. 43 Table of Contents Expanding our credit portfolio, we launched products designed to diversify risk and address high-demand business: –FGTS Birthday Withdrawal Anticipation: A secured product offering competitive rates starting at 1.29% per month, with R$28 million already loaned as of December 31, 2025. Customers can front up to 10 years of withdrawals, with automatic repayment through their FGTS balance. –Workers Credit (Crédito do Trabalhador): Introduced in September 2025, this payroll-linked loan targets formal private-sector workers, offering R$500 to R$20,000 with up to 36-month terms. Regulatory updates enabling digital contracting through CTPS Digital opened a market of 45 million eligible workers, supporting faster growth versus traditional personal loans. Our strategy also includes credit portfolio diversification in partnership with other fintechs such as Noverde, Creditas, Facio and Klubi, offering Home Equity, Auto Equity, Micro Loans and Consortia. A major milestone was the Central Bank’s approval of Vivo Pay as a Direct Credit Society (SCD) in 2024, enabling full operational control and paving the way for the launch of our digital account, currently in controlled testing with employees. Insurance Services Insurance remains another essential component of our financial services ecosystem. Our partnership with Zurich enabled the creation of Vivo Seguro Celular, a simple and fully digital solution to protect smartphones. Building on this success, we expanded coverage to include notebooks, tablets, smartwatches and headphones, and as of December 31, 2025, the portfolio had reached approximately 600,000 insured devices. Notably, more than 40% of smartphones sold in that period left our stores with insurance included, and the customer base grew 42% YoY as of December 31, 2025. In 2024, we strengthened distribution by enabling the full purchase and management of insurance through the Vivo Pay section of the app. We also launched a simplified plan priced at R$14.90 per month, offering R$2,000 in coverage, which contributed to strong commercial traction. Our portfolio continued to expand with: –Home Insurance (launched in March 2025, in partnership with Chubb and Porto Serviços): three plans ranging from R$13.90 to R$85.90, with coverage between R$100,000 and R$1 million; and –Travel Insurance (launched in December 2025 with Chubb): plans for domestic and international travel starting at R$29.90, with coverage from R$20,000 up to US$35,000. 44 Table of Contents Corporate innovation In recent years, we have not only established new business ventures that have accelerated our digital transformation but also increased the contribution of these services to our overall revenue. These services accounted for 12.1% of our total revenue in the year ended December 31, 2025. We continue to invest in research and development to create innovative services that enhance our customers’ experience and provide greater convenience in their daily lives: •In the healthcare ecosystem, in 2023, we acquired 100% of the shares of Vale Saúde Sempre, a startup operating as a healthcare services marketplace. The platform offers affordable access to consultations (in-person and telemedicine), exams, and surgical procedures through a monthly subscription. It boasts an accredited network of thousands of laboratories and medical clinics throughout Brazil. In 2024, we leveraged this acquisition to expand our operations in the B2C segment, utilizing Vivo’s extensive sales force, increasing our B2B customer base, adding new partners to the accredited network, and introducing dental services. In 2025, we expanded our network of clinics and laboratories with the goal of bringing healthcare to all regions of Brazil, and we also enhanced our portfolio by offering discounts at more than 11,000 pharmacies. As a result, Vale Saúde Sempre served over 471,000 users in the year ended December 31, 2025 and has seen its net revenue multiply by approximately 1.6x in the year ended December 31, 2025. •In education, we advanced our joint venture with Ânima Educacional, VivaE, launched in 2022. This EdTech focuses on open courses aimed at preparing individuals for emerging digital market professions. With its proprietary teaching methodology, VivaE now offers over 50 courses and surpassed 100,000 users as of December 31, 2025. Additionally, it began exploring the B2B market and participated in Telefônica’s internship selection process, where candidates took courses, and the top performers advanced. In 2025, VivaE began selling courses directly to companies. •Additionally, we repositioned our Smart Home value proposition by focusing on key customer journey pillars such as consultancy, installation, device configuration, and specialized support. Initially offering on-site installation and automation services in São Paulo, we expanded to every city where Vivo broadband is available. In addition, Vivo launched a home monitoring service that provides cameras for a monthly fee, highly valued by customers with pets, children, and elderly relatives. This service offers options for live feed or recording, accessible via the Vivo Smart Home app. The app now includes a dedicated Smart Home section to educate customers about devices and functionalities, showcase purchasable products, and integrate connectivity and smart home features. •In the renewable energy business, GUD Energia—our joint venture with Auren, established in 2024—is advancing its strategy to expand access to competitive and sustainable energy in the medium-voltage segment, while remaining fully focused on the opening of the low-voltage market, approved in November 2025 by the Brazilian federal government through Law No. 15,269. This regulatory milestone will enable GUD to offer renewable and sustainable energy to millions of B2B customers by 2027 and to tens of millions of residential customers by 2028. In addition, Vivo Ventures, our corporate venture capital fund, made four strategic investments in 2025 (for more information, see “Item 4. Information on the Company—A. History and Development of the Company—Historical Background—Launch of Corporate Venture Capital Fund”), as follows: In 2025, Vivo Ventures made nine investments across strategic areas such as Fintech, Education, Insurtech and Legal, reinforcing its focus on digital platforms with strong potential for operational synergies, distribution leverage, and value creation within Vivo’s ecosystem. In December 2024, Vivo Ventures entered into a commitment of US$2 million with Canary, a leading venture capital manager in Brazil, as part of its funds-of-funds strategy, with the objective of strengthening its presence within the venture capital ecosystem, enhancing long-term relationships with top-tier fund managers and expanding access to high-quality investment opportunities aligned with its strategic priorities. 45 Table of Contents In February 2025, Vivo Ventures completed an equity investment of R$11.4 million in Facio, a fintech specialized in credit origination and automation for financial institutions, offering end-to-end solutions that streamline underwriting, risk assessment and customer onboarding through technology and data-driven processes. The investment supports Facio’s expansion in the Brazilian credit market and aligns with Vivo’s strategy to strengthen its presence in financial services and digital lending solutions. In July 2025, the FIP executed an initial investment of R$1.36 million in Elevify, an edtech focused on upskilling and professional development, offering digital education solutions aimed at improving employability and workforce qualification through scalable online programs. This investment aligns with Vivo Ventures’ interest in education platforms that leverage technology to democratize access to high-quality learning. In September 2025, Vivo Ventures committed R$35.0 million to AsaaS as part of a minority equity acquisition. AsaaS is a fintech that provides an integrated financial management and payments platform for small and medium-sized businesses, enabling billing, collections, payments and financial control through a single digital interface. The company supports SMEs in improving cash flow management and operational efficiency, strengthening Vivo’s positioning in solutions tailored to the SME segment. In October 2025, the FIP acquired a minority stake of R$13.3 million in 180 Seguros, an insurtech that offers embedded insurance solutions through APIs, enabling companies to seamlessly integrate insurance products into their digital journeys. The platform focuses on modular and flexible insurance offerings that enhance customer experience and open new digital distribution channels, in line with Vivo Ventures’ strategy in embedded finance and digital protection solutions. Also in October 2025, Vivo Ventures became a shareholder of Ada Tech through a corporate reorganization and merger involving Vivae — the edtech jointly created by Telefônica Brasil S.A. and Ânima Educação — and Ada Tech. As part of this transaction, the equity interest in Ada Tech previously held by Wayra, together with Telefônica Brasil’s stake in Vivae, was transferred to FIP Vivo Ventures, which now directly holds the participation and remains a shareholder of Ada Tech. Ada Tech is an education technology company focused on training and reskilling professionals in software development, data, artificial intelligence and other high-demand digital skills, combining online learning, hands-on projects, and corporate partnerships. In December 2025, Vivo Ventures also carried out a follow-on investment of R$2.7 million in Facio, further reinforcing its confidence in the company’s execution and growth trajectory. The additional capital is intended to support product development, commercial expansion and the strengthening of its technology platform. In December 2025, the FIP concluded an initial equity allocation of R$1.9 million in Inspira. Inspira is a legaltech that develops digital solutions to increase efficiency and automation in legal operations, supporting law firms and corporate legal departments with tools for process management, analytics and decision-making. Finally, Vivo Ventures also approved an increase in the fund’s committed capital, raising its total size to R$470 million. As part of this expansion, the FIP received a new share subscription of R$150 million, with 98% subscribed by Telefônica Brasil S.A. and 2% by Telefonica Open Innovation, S.L. The subscribed amount will be disbursed through capital calls as new investment opportunities in startups are executed. Finally, in recognition of our efforts in developing a robust digital ecosystem, Vivo received several prestigious awards in 2025: Valor Inovação Brasil — Vivo ranked 1st in Telecommunications and 9th overall in the Valor Inovação ranking, which highlights the 150 companies with the best innovation practices in Brazil. EY Brasil, Sling Hub, and Alya Ventures — Vivo was recognized in the Ranking of Corporations That Invested the Most in Brazilian Startups in 2024, promoted by Sling Hub and its partners. 46 Table of Contents 100 Open Corps — Vivo ranks Top 2 in open innovation in Brazil and is the leader in the Telecommunications sector, according to the 10th Edition of the 100 Open Startups Ranking. MIT Innovative Workplaces Brazil — Vivo is part of the ranking of the 20 most innovative organizations in Brazil, recognized for their ability to drive transformation. Prêmio Seleção Mobile Time 2025 — Vivo won in the Innovation in Telco category for its GUD Energia initiative, recognized by the jury among the top mobile innovation projects. Corporate services We offer our corporate clients comprehensive telecommunications solutions and IT support designed to address specific needs and requirements of companies operating in all types of industries (retail, manufacturing, services, financial institutions, government, etc.). Our clients are assisted by our highly qualified professionals who are capable of meeting the specific needs of each company with voice, data, broadband, computer services solutions, including hardware and software, and digital solutions, such as cloud, cybersecurity and IoT. We work to consistently achieve greater quality and efficiency in our services and increase our level of competitiveness in the market. Sale of smartphones, devices and accessories We sell 5G NR and LTE devices such as smartphones, broadband USB modems and devices that are certified to be compatible with our network and service, including eSIM devices. We also sell a range of connected and non-connected gadgets offering our customers quality and technological products such as tablets, notebooks, gaming consoles, wearables, speakers, e-health devices, smart home devices, TVs, etc. We have special offers on smartphones and other data devices for customers of bundled packages. Our current smartphone suppliers are Samsung, Apple, Motorola and Oppo, our device suppliers area Intelbras, Flex (Mitrastar), Blucastle, Tellescom (Askey) and ZTE and our gadgets suppliers are Samsung, Apple, Harman (JBL and Kardon), Lenovo, LG, Hisense, Timbro (Amazon), Intelbras, Positivo (Positivo and Vaio), Steck, Allied (Logitech, TPLink and Xbox), Alfacomex (Geonav), Customic, i2Go, Aya Pitaya, Glowshine, Simerx, Motorola, Multi (DJI and Multi), DPC (Renpho), Proparts (Garmin), Flex (Mitrastar), Tellescom (Askey), Blucastle, RCELL (Nintendo and Playstation), Sony Entertainment (Playstation), WAP (WAAW), Relaxmedic and Up2Tech (JBL, Lenovo, Nintendo, Playstation, Anker, Philips, LG and TCL). Smartphone and other electronics sales continued a positive trajectory in 2025 with important growth results, aligned with our strategy to gain profitability and become an important player in the electronics segment. This was the result of our strategy of portfolio expansion, enhanced distribution, and communication initiatives emphasizing that Vivo can provide everything customers need, as well as through our sales channels attracting high-value customers to our physical and online stores. We also had important achievements with our own accessories brand, Ovvi, launching new products focused on design excellence and quality, making relevant partnerships and sponsorships, and adding even more market value to our business. We will continue to seek to provide everything customers need, leveraging our sales channels, which are focused on attracting high-value customers to our physical and online stores. 47 Table of Contents Rates, Taxes and Billing Rates We generate revenue from (i) activation and monthly subscription charges, (ii) usage charges, which include measured service charges, (iii) interconnection fees that we charge to other telecommunications service providers, and (iv) other additional services. Rates for all telecommunications services are subject to extensive regulation by ANATEL. We set forth below the different methods used for calculating our rates. Local rates With the termination of the STFC Concession agreement through the signing of the Settlement Agreement with ANATEL, we undertook a commitment until the end of 2028 to maintain service to customers in 373 locations in 166 municipalities in the state of São Paulo through a service plan that ensures consumers in these areas receive pricing conditions that are compatible with or more advantageous than those offered under the Basic Service Plan in effect at the time of adaptation. This includes offers similar to (i) the Local Basic Plan of the Concession (for customers who mainly make short-duration calls - up to three minutes - during business hours) and (ii) the Special Class Individual Access Plan – AICE (created specifically for families enrolled in government assistance programs). On the other hand, the company became able to provide fixed-line telephony services throughout the country through an Authorization. In the Authorization modality for the provision of fixed-line telephony, the company ceased to have obligations related to the availability of mandatory Offers, being able to work only with Offers, which can be made available for commercialization and/or discontinued with greater flexibility, according to rules set forth in ANATEL’s regulations. Long-distance rates Rates for domestic, long-distance calls are based on the time of day, the day of the week, and the duration and distance of the call, and may also vary depending on whether special services, including operator assistance, are used. We have several options for domestic, long-distance calling offers for consumers using our carrier dial code (15). Customers of any local or long-distance operator may use dial code 15 when dialing long-distance to benefit from our rates. In March 2020, ANATEL approved Resolution No. 724, which established a standard for the implementation and monitoring of tariff freedom in the STFC, for use by the general public in the national, long-distance mode. Since then, we have been free to set domestic long-distance fees at market rates. Later, Resolution No. 724 was replaced by Resolution No. 768 in August 2024. We also offer international long-distance rates, that are also available to all users using dial code 15. International, long-distance calling charges are based on the time of day, the day of the week, the duration and the destination of the call, and may also vary depending on whether special services are used, including operator assistance. Our rates for international services are not subject to regulation and are not required to follow the annual rate adjustments described above for other services. We are free to negotiate our fees for international calls based on the international telecommunications market, in which our main competitor is Claro (through its Embratel business). With respect to long-distance calls, we have developed alternative rate offers for residential and corporate customers. Mobile services rates Rates for our Local Basic Plan and certain roaming charges incurred in connection with alternative offers are subject to annual adjustments pursuant to our authorizations. Current rates, which are revised annually, can be readjusted for the following year at most by the rate of inflation as measured by the IGP-DI index. The maximum rate applies to all mobile service offers, but mobile operators are allowed to freely set the prices charged on these offers (other than with respect to certain roaming charges). 48 Table of Contents The initial price cap we agreed upon with ANATEL in our authorizations was based on previously existing or bidding prices, and has been adjusted annually based on a formula contained in our authorizations. As of the date of this annual report, the most recent adjustment was approved in February 2025, which set fees at R$0.22044 for regular hours and R$0.15430 for reduced hours (net of taxes). Interconnection fees We are paid interconnection fees by any fixed-line or mobile service provider that either originates or terminates a call within our network. We also pay interconnection fees to other service providers when we use their network to place or receive a call. The interconnection fee is a flat fee charged per minute of use that directly affects fixed-line and mobile services rates. Since 2005, interconnection agreements are freely negotiated among the service providers, subject to a price cap and to compliance with the regulations established by ANATEL, which include not only the interconnection basic costs including commercial, technical and legal aspects, but also the traffic capacity and interconnection infrastructure that must be made available to requesting parties. If a service provider offers to any party an interconnection fee below the price cap, it must offer the same fee to any other requesting party on a non-discriminatory basis. If the parties cannot reach an agreement on the terms of interconnection, including the interconnection fee, ANATEL can establish the terms of the interconnection. For additional information about interconnection fees, see “—Regulation of the Brazilian Telecommunications Industry—Interconnection fees.” Data services rates We receive revenue from charges for data transmission, which includes our fixed broadband, dedicated analog and digital lines for privately leased circuits to corporations and other services. Data transmission rates are not regulated by ANATEL, including for EILD (wholesale links up to 34 Mbps) and High Capacity Data Transport (wholesale links above 34 Mbps) that are no longer regulated markets. Multimedia services operators can freely set the rates for their offers. TV rates Pay TV rates are not regulated. Service providers are allowed to freely set the rates for basic and alternative offers. Taxes The cost of telecommunication services to each customer includes a variety of taxes. The main tax is a state value-added tax, the Imposto sobre Circulação de Mercadorias e Serviços, or ICMS, which the Brazilian states impose at rates ranging from 4% to 24% (except for the state of Amapá, which maintains a 29% ICMS rate to Telecommunications Services) on certain revenues from the sale of goods and services, including telecommunication services, Telecommunication services have recently been classified as essential by Supplementary Law No. 194/2022. As such, the ICMS rates on telecommunication services cannot exceed the general ICMS rates foreseen by each State’s local regulations. Other taxes include: (1) Federal Social Contributions (Contribuição para o Programa de Integração Social), or PIS, and Social Security Financing Contributions (Contribuição para o Financiamento da Seguridade Social), or COFINS; (2) FUST contributions; (3) FUNTTEL contributions; and (4) FISTEL contributions. 49 Table of Contents Significant changes in tax legislation Constitutional consumption taxes reform On December 20, 2023, Constitutional Amendment No. 132 was enacted, introducing a new model of taxation on consumption in Brazil. Complementary Law No. 214/2025, published on January 16, 2025, regulates the tax reform. In summary, this reform replaces federal taxes PIS and COFINS with a Contribution on Goods and Services (CBS), while state tax ICMS and municipal tax ISS will be replaced by a Tax on Goods and Services (IBS). Taxation will be exclusively destination-based and fully noncumulative, meaning that the CBS and IBS taxes applied at each stage will be credited and deducted from the taxable base by taxpayers in their calculations, except for acquisitions intended for personal use and consumption. The CBS and the IBS will be calculated “outside” the taxable base, whereas the current ICMS and ISS taxes are calculated “inside” and included in the taxable base itself. A transition period from 2026 to 2032 will gradually phase out the existing taxes in favor of the IBS and CBS. During this transition, operational complexity is expected due to the coexistence of two consumption taxation models. However, taxation is anticipated to be effectively simplified beginning in 2033. In 2026, a testing period will commence, during which a 0.9% CBS rate and a 0.1% IBS rate will be applied. However, this levy will not result in an actual economic burden, as compliance with the ancillary obligations related to the new taxes during this period effectively exempts taxpayers from payment. Alternatively, should any amounts be paid, the sums collected as CBS and IBS may be offset against PIS and COFINS contributions, such that no economic effect is expected for 2026. The reform also introduces a federal selective tax on the production, extraction, commercialization, or import of goods and services harmful to health or the environment. Notably, a constitutional provision exempts telecommunications services from this tax. Complementary Law Project No. 108/2024, which mainly addresses tax auditing and litigation in connection with this reform, has been approved by the Brazilian Congress and is currently pending presidential sanction. The new taxes will still require further regulation through additional laws and norms, and further input on this may become available during the 2026 testing period. Changes in the ICMS tax rate In June 2022, Complementary Law No. 194 was enacted, prohibiting higher tax rates for telecommunications services compared to generally applicable rates, in compliance with an STF ruling. As a result, telecommunications services, which had historically been subject to higher ICMS rates than other products and services, are now taxed at the same rates as general goods under this law. Towards the end of 2023, 11 states—including Bahia, Ceará, Distrito Federal, Goiás, Maranhão, Paraíba, Pernambuco, Paraná, Rio de Janeiro, Rondônia, and Rio Grande do Norte—adjusted their general ICMS tax rates, effective in 2024. On average, these changes resulted in a 2% increase in the ICMS rate. In 2025, three additional states (Piauí, Maranhão, and Rio Grande do Norte) implemented further increases to their general ICMS tax rates, ranging from 1% to 2%. Telefônica Brasil is actively working to ensure accurate ICMS tax calculations within the deadlines specified by each state. These changes may potentially affect the prices charged to our customers. 50 Table of Contents Changes in the deductibility rules for interest on shareholders’ equity On December 29, 2023 Law No. 14,789 was enacted into law and set forth new rules for calculating interest on shareholders’ equity. The rule mainly focuses on adjustments to equity through the exclusion of transactions with related parties, as well as some accounts such as tax incentive reserves. We do not expect that these new rules will have a significant impact on the calculation of interest on shareholders’ equity for Telefônica Brasil. Changes in investment grants rules New regulations for calculating tax incentives associated with investment subsidies were introduced through Law 14,789, dated December 29, 2023. These regulations bring about a new framework in which a legal entity, taxed on actual profits, that receives a grant from the Union, states, the Federal District, or municipalities for the implementation or expansion of an economic enterprise may compute an investment subsidy tax credit. The legal entity is required to formally submit a request to the Brazilian Federal Revenue Service, providing all relevant details of the enterprise, to obtain prior approval for the granted tax credit. If there is no response from the Brazilian Federal Revenue Service within 30 days, qualification becomes automatic. The previous system led to substantial disputes involving billions of dollars between taxpayers and the Brazilian Federal Revenue Service. Consequently, the new law establishes a mechanism for companies to resolve their debts, with reductions in the disputed amounts if the taxpayer opts for settlement. Telefônica Brasil is not anticipated to be significantly impacted by the new rules and does not currently have a tax dispute related to this matter. Changes in taxation rules on investments in investment funds On December 12, 2023, Law 14,754/23 was enacted, introducing several normative changes exclusively applicable to individuals domiciled in Brazil. Among these changes, a new rule concerning withholding tax on income earned by corporate investors in investments in Brazilian investment funds was implemented. The law stipulates periodic withholding in May and November of each year, with a rate of 15% (general rule) or 20% (specific rule applicable to investment funds with a portfolio of securities having an average term equal to or less than 365 days). However, the new rule for periodic withholding of IRRF (Income Tax on Financial Transactions), in principle, is not expected to have significant effects on Telefônica Brasil concerning the income generated by the our equity investment fund, Vivo Ventures and our credit rights fund, Vivo Money Credit Rights Investment Fund. This is due to a specific rule excluding them from this regulatory scope as they are qualified as investment entities and comply with other requirements expressed in the legislation. As the matter is still controversial and requires clarification from the Brazilian Federal Revenue Service, we are closely monitoring the topic to ascertain if this scenario changes. Introduction of OECD-inspired minimum income taxation rules On December 27, 2024, Law 15.079/24 was enacted, establishing an additional Social Contribution on Net Income (“CSLL”) as part of the process of adapting Brazilian legislation to the OECD Global Rules Against Base Erosion (“Pillar II”). According to this law, whenever the Company, adopting the calculation criteria provided therein, determines an effective combined rate of Income Tax and Social Contribution on Net Profit lower than 15%, it must make an additional payment until it reaches this minimum percentage. This rule has been in effect since January 2025, and the Company does not expect a significant impact from this rule on its tax payments, as it already complies with the established limits. Transfer Pricing Rules – Alignment with OECD Standards On December 28, 2022, Law No. 14,596/2023 was published, later regulated by RFB Normative Instruction No. 2,161/2023, which established the new Brazilian Transfer Pricing regime, aligned with OECD guidelines. The new rules became mandatory as of January 1, 2024, and aim to ensure that intercompany transactions are carried out in accordance with the arm's length principle. 51 Table of Contents The Company is currently in the process of preparing the analysis for the corresponding fiscal year, including a comparability study, supporting documentation, and a review of applicable methods, as provided for in current legislation. Although the technical process is still under development, the Company does not expect significant impacts from the adoption of the new transfer pricing regime, given the nature of the transactions carried out and the history of compliance with international standards. The Company will continue to monitor the application of the regulations and will keep its financial statements updated based on any adjustments identified upon completion of the formal transfer pricing analysis." Billing For postpaid customers, we send each contract customer a monthly bill covering all of the services provided during the previous monthly period. Pursuant to Brazilian law, telephone service providers are required to offer their customers the choice of at least six different monthly payment dates. For prepaid customers, billing is available online. We have a billing and collection system with respect to local, national and international long-distance voice, subscriptions, broadband, data, IT services, outsourcing, television and third-party services. For invoice payments, we have agreements with various banks. These agreements include options for customers to select their preferred payment type: direct debit, PIX, payment to a bank, Internet and other collection agencies (including lottery-playing facilities, drugstores and supermarkets). We aim to avoid losses in the implementation of new processes and the roll-out of new products through the monitoring of billing, collection and recovery controls. These practices are closely monitored by our revenue assurance team, which measures every risk of revenue loss detected along the billing and collection chain. These risks are managed to minimize revenue losses. Co-billing In accordance with Brazilian telecommunications regulations, we use a billing method called “co-billing” for both fixed-line and mobile services. This method allows billing from other phone service providers to be included within our own invoice. Our customers can receive and subsequently pay all of their bills (including the fees for the use of services of another telephone service provider) on our invoice. To allow for this method of billing, we provide billing and collection services to other phone service companies. We have co-billing agreements with national and international long-distance phone service providers. Similarly, we use the same method of co-billing to bill our services to customers of other fixed-line and mobile providers. This service is charged to the long-distance operator, by means of a call record described in the invoice. Value-added services Value-added services such as entertainment, information and online interactivity services are available to mobile prepaid, postpaid and fixed-line customers through agreements with content suppliers. These agreements are based on a revenue-sharing model. Third-party services We incorporate third-party services in our billing, collection and transfer process. These services are later passed on to the third-party contractor. 52 Table of Contents Collection Our collection practices for delinquent customers comply with the guidelines established by ANATEL (the Brazilian National Telecommunications Agency), as well as with the regulations of the Telecommunications Services Agency (RACO) and the Consumer Protection and Defense Foundation (PROCON). As a general rule, for mobile and fixed-line services, customers who remain past due for more than 15 days may have promotional benefits suspended. If payment remains outstanding for more than 30 days after the suspension of such benefits, service may be fully suspended, including both outgoing and incoming calls, until payment is settled. For Pay‑TV services, full suspension may occur if payment is overdue for more than 15 days. Customers with outstanding balances may opt for an installment payment arrangement. However, if bills remain unpaid for 60 days following full suspension, the contract may be terminated and the delinquency reported to credit protection bureaus. The debt collection process involves sequential steps, beginning with internal outreach via interactive voice response, SMS, and email, followed by a formal payment reminder notice. If the outstanding balance persists, the customer’s information may be forwarded to an external credit recovery agency. Concurrently with our internal process, delinquent customers are also contacted by collection agencies. Customer risk profile, overdue debt and other quality issues are used to increase strategy efficiency and maximize debt recovery efforts. As of January 2018, bad debt provisions were adjusted due to changes brought by IFRS 9, including new criteria that follow an expected credit loss model, adopting a percentage of risk for each debt payment profile until the moment of effective loss (100%). The percentages were calculated according to the historical behavior of delinquency for each segment. In accordance with Brazilian regulations, bad debt write-offs are permitted for late payments of zero to R$5,000 if they are over 180 days late or R$5,001 to R$30,000 if they are over 365 days late. Late payments of over R$30,001 that are open for more than 365 days require a lawsuit to be initiated. This rule is applied for outstanding debt through October 8, 2014; after this period, the amount ranges for bad debt write-offs change as follows: zero to R$15,000 if they are over 180 days late or R$15,001 to R$100,000 if they are over 365 days late. Lawsuits are required for debts over R$100,000 open for more than 365 days. Provisions for doubtful accounts in the year ended December 31, 2025 were 1.9% of the total gross revenue. 53 Table of Contents Our Markets of Operation After signing the unified term on April 11, 2025, we began offering, under the authorization regime, fixed-line telephone pay TV, mobile voice and broadband services throughout Brazil. In addition, we also offer a variety of value-added services, some of them through commercial partnerships. Area Pop. (million) Percent of Brazil’s pop. GDP (R$ million) Percent of Brazil’s GDP Per capita GDP (reais) São Paulo State 44.4 21.9 % 3,444,814 31.5 % 77,566 Minas Gerais State 20.5 10.1 % 971,978 8.9 % 47,321 Rio de Janeiro State 16.1 7.9 % 1,172,871 10.7 % 73,053 Bahia State 14.1 7.0 % 430,988 3.9 % 30,477 Paraná State 11.4 5.6 % 670,919 6.1 % 58,624 Rio Grande do Sul State 10.9 5.4 % 650,107 5.9 % 59,736 Pernambuco State 9.1 4.5 % 270,475 2.5 % 29,857 Ceará State 8.8 4.3 % 232,239 2.1 % 26,406 Pará State 8.1 4.0 % 254,547 2.3 % 31,348 Santa Catarina State 7.6 3.7 % 513,393 4.7 % 67,460 Goiás State 7.1 3.5 % 336,747 3.1 % 47,722 Maranhão State 6.8 3.3 % 149,227 1.4 % 22,021 Paraíba State 4.0 2.0 % 96,963 0.9 % 24,395 Amazonas State 3.9 1.9 % 161,795 1.5 % 41,048 Espírito Santo State 3.8 1.9 % 209,830 1.9 % 54,733 Mato Grosso State 3.7 1.8 % 273,009 2.5 % 74,620 Rio Grande do Norte State 3.3 1.6 % 101,740 0.9 % 30,805 Piauí State 3.3 1.6 % 80,917 0.7 % 24,736 Alagoas State 3.1 1.5 % 89,689 0.8 % 28,676 Distrito Federal State 2.8 1.4 % 365,669 3.3 % 129,790 Mato Grosso do Sul State 2.8 1.4 % 184,402 1.7 % 66,885 Sergipe State 2.2 1.1 % 60,817 0.6 % 27,519 Rondônia State 1.6 0.8 % 76,456 0.7 % 48,353 Tocantins State 1.5 0.7 % 64,318 0.6 % 42,553 Acre State 0.8 0.4 % 26,291 0.2 % 31,676 Amapá State 0.7 0.4 % 28,020 0.3 % 38,187 Roraima State 0.6 0.3 % 25,125 0.2 % 39,461 Total 203.1 100.0 % 10,943,345 100.0 % 53,887 (1)According to IBGE data (2023) collected at https://www.ibge.gov.br/ – subject to revision. (2)Average per capita GDP for Brazil, weighted by the percentage of the population represented by each state. Seasonality Our business and results of operations are not materially affected by seasonal fluctuations in the consumption of our services. 54 Table of Contents Marketing and Sales Overview Our commercial distribution network (marketed under the Vivo brand), as of December 31, 2025, consisted of 288 own sales outlets throughout Brazil. In addition, we also have approximately 10,683 sales outlets run by authorized dealers (including exclusive dealers and retail channels), maintaining a solid capillarity strategy that contributed to our leadership position in the Brazilian telecommunications market. As of December 31, 2025, we had approximately 285,000 points of sale where prepaid mobile service customers could purchase credits using Distribution or Online channels. Prepaid phones can be credited remotely or by purchasing cards containing credits. We bring our solutions to our customers through the following physical sales channels: •Vivo Stores: continuing our purpose of bringing new experiences to our consumers, in October 2025 we opened a new store on Oscar Freire Street, one of the most iconic locations in São Paulo. With the goal of seeing without filters, face-to-face, and reminding everyone that life also happens beyond screens, we brought Café Vivo into the store, reinforcing the company’s positioning. •Exclusive dealers: this channel is made up of selected and certified companies to supply our complete portfolio of products. These resellers constitute an extensive distribution network across the country, with 1,442 stores (as of December 31, 2025) capable of offering our complete portfolio of products and services. It is a channel with significant acceleration in the evolution of the customer experience journey in 2025, equating availability and depth of product stock in each store, as well as payment conditions with other sales channels. Focusing on business sustainability, both for Vivo and its resellers, we promote a constant evolution in the qualification of physical store structures, ensuring standardization and proper adequacy. This measure reinforces our commitment to agile and sustainable management, aimed at creating value and strengthening our foundation for future expansion. •Retail channel: our retail channel sells prepaid and top-up products that are sold by our partners’ own sales teams. In 2025, we continued attempting to reestablish commercial relationships with the biggest national retail companies with the objective of resuming the channel’s growth. •Distribution and digital channel: the broadest and most complex sales channel in our markets, allows our prepaid customers to purchase data and voice credits. To be as close as possible to potential and current customers, this channel is made up of accredited agents, lottery outlets, post offices, bank branches and small retailers, such as pharmacies, newsstands, bookstores, stationery stores, bakeries, gas stations, bars and restaurants. In digital, we have banks, fintechs and digital distribution partners. In 2025, this channel kept the majority of our prepaid sales (96%) and top-up revenue (87%) and was responsible for maintain our prepaid market share leadership, achieved in 2020. This was obtained by adopting a strategy of deepening the availability of Vivo SIM Cards at top performing retailers, with support of price-led campaigns. •Door-to-door sales: this channel continues to strengthen with the growth of the fiber network across the country, consolidating the sales force, focusing on quality and now seeking to totalize our customers with fixed-mobile convergent offers. This is a strategic channel that offers convenience to customers and is suitable for selling telecom services to B2C and B2B customers. The fiber market requires important local knowledge for greater sales penetration and that is why a hunter channel such as door-to-door sales is so important for this segment. 55 Table of Contents •Outbound telesales: characterized by the lack of geographical limitations, our outbound telesales channel can reach existing and potential customers across the country, offering possibilities of migration from prepaid to postpaid services in addition to FTTH. This channel focuses on increasing the customer base, identifying new customers and offering suitable plans to our existing customers according to their consumption profile. Customer experience In 2025, Vivo consolidated its strategy with a non‑negotiable commitment: putting the customer at the center of everything, because the customer’s time is now. Guided by the principle “Vivo Sempre”, the company remained firmly focused on delivering the best experience to all customers across every touchpoint and that reinforced its value proposition: “Vivo is technological and excellent in quality”, “Vivo is close and solves my needs”, and “Vivo makes me feel special”. To achieve this goal, the company strengthened its performance across its strategic pillars: providing a single customer view across all channels; resolving customer issues on the first interaction; giving visibility into every step of their journey, proactively keeping them informed; ensuring customers don’t have to repeat their story each time they contact us; anticipating and resolving issues before they arise; and consistently offering self‑service options across digital channels. These pillars translate into innovations that enhance customer experience, such as the new master registration, which gives customers the autonomy to define their contact name across all channels directly through the Vivo App, and the monitoring and quality telemetry systems installed in the modems, enabling proactive remote troubleshooting actions or the dispatch of a technical team when necessary. This continuous, purposeful, and passionate dedication to the customer is widely recognized by the market. In 2025, Vivo was granted as a three‑time champion in three of the main customer experience awards: Experience Awards (SoluCX) for highest NPS in mobile and broadband, Excellence in Customer Service (Consumidor Moderno), and Best Broadband Services (Estadão). We also won the Gold Trophy in the first edition of the CX Award (Clientes SA) in the IT & Telecom segment and were nominated as the Company that Most Respects Consumers in Mobile Services (Consumidor Moderno). More than awards, these recognitions reflect our essence: always present, always close, always Vivo. Technology Voice and data networks To offer a broader portfolio of integrated services, we have incorporated several technologies into our voice and data networks. In 2025, we strengthened our virtualization program, enabling the offering of 5G SA-based services. We consolidated offerings based on slice technologies for mobile voice services, advanced in mass adoption with VoLTE, and initiated investments in VoNR (5G SA). For mobile voice services, we consolidated our digitalization program of voice using VoLTE (Voice LTE) as well as started investing in new technologies like VoNR (5GSA). For mobile data, we have intensified investments in the 5G SA network, enhancing the customer experience. In synergy with the fixed network, we are reusing Core solutions aimed at improving latency and reducing the amount of data transmitted on our transport network. For the fixed voice network, we offer VoFTTH (Voice over FTTH) services, SIP trunks, Unified Communications, and SIP interconnections. In addition, we continue expanding our network by deploying fiber optics in cities that already have copper-based voice services, while working on initiatives such as legacy network shutdown, modernization, site decommissioning, voice digitization, and synergies between fixed and mobile networks. We have consolidated our unified IMS core and Session Border Controllers (SBCs) at our access edge and peering edge to support VoIP growth. All these initiatives have enabled savings in terms of energy efficiency, labor, and maintenance costs. 56 Table of Contents The IP Backbone is a strategic asset to meet customer demands and support the development of a large number of services, such as: –Expansion of 5G, IOT, VoD, Live Events. –Development of cloud, –Expansion of fiber optics to customer homes, –Migration of voice and television services to IP, For all of this, the IP Backbone must be robust, providing high availability, performance, cost-effectiveness, and high bandwidth at the same time. However, as more bandwidth is offered to customers, the need to bridge the gap between revenues and investment to cope with greater traffic becomes increasingly clear. To achieve this goal and increase revenues, the following actions have been implemented over the last few years: •Modernization and Simplification of the Network—This initiative began in 2018 through the replacement of existing routers with new routers with higher capacity, which enabled the consolidation of specialized routers, thereby reducing network layers and transforming our backbone into a multi service network. This new design accommodates service evolution, as voice, messages, and circuits become data packets, reducing the need for incremental capacity increases. •Bringing services and content nearer to customer—We believe that in the coming years, layer simplification could allow us to bring content even further to the edge, improving costs and quality at the same time. The foregoing actions are expected to optimize investment in an aggressive traffic increase context and lay the groundwork to deliver the next step in data services quality. Even though bandwidth has been the main technical advantage for several years, latency will take over as the main broadband selling point. To reduce network latency means delivering more responsive services and obtaining higher customer satisfaction. To achieve this result, we believe service should be decentralized and delivered closer to the edge of the network and to customers, which we have taken steps toward by expanding the use of caching solutions throughout the network, making content locally available to our customers, and reducing traffic costs while strongly improving the user experience without increasing access investments. •Use of high-speed interfaces in the core (400G, 800G) – this allows to optimize the resources and reducing costs by Mbps in the IP Backbone Core. •Evolution to SDN (Software Defined Network) – we began implementing SDN in 2025 to seek greater flexibility, agility, and reliability for the network. We further optimized costs by sharing access networks with other Brazilian operators, in which IP backbones played a key role in connecting and transporting traffic among different operator’s networks, reducing the need for mobile sites expansion. The implementation of IPv6 was important to ensure full connectivity for our customers and to support sales, allowing us to continue expanding our customer base. Finally, we have a solid Carrier Grade Nat solution (CGNAT) already developed for the mobile services, which will be extended to fixed-line services along the next years as an additional solution. LAN – Local Area Network In our Telecom Data Centers, the Local Area Network (LAN) structure provides connectivity for platforms and servers on both the Fixed and Mobile networks. The local network is the access point for all services and provides connectivity to the IP BackBone. 57 Table of Contents In 2025, we maintained the strategy of evolving the TRILL model into the Spine & Leaf model. We have moved from a 3-layer architecture model (Core-Aggregation-Access) to a 2-layer model (Spine & Leaf). The new model is a technological evolution that provides even greater resilience in the local network than TRILL. In addition to greater resilience, we can leave the architecture with one less layer, which means simplifying the network and reducing implementation costs. With the new Spine & Leaf architecture, we maintain the concept of decentralization in Telecom Data Centers. Just like TRILL, Spine & Leaf also uses Top of Rack (TOR) and End-of-Row (EOR) switches, allowing cost savings on structured cabling, reduction of energy, space and cooling. In 2025, we expanded the ports and took the opportunity to change technology from TRILL to Spine & Leaf Technology in three existing sites. In 2025, we reinforced our CDN strategy to deliver a superior customer experience and optimize backbone performance. We continued deploying local caching solutions to reduce IP backbone bandwidth consumption and minimize latency, ensuring seamless delivery of high-quality content across multiple devices and screens. This approach supported the growing demand for interactive applications and rich media experiences, including large-scale live streaming events where stability and low latency are critical. Throughout the year, we worked closely with strategic partners to expand cache capacity, refresh infrastructure, and implement advanced optimizations that improved traffic distribution and resilience. In parallel, we enhanced peering connections with key networks, reducing transit dependency and improving end-to-end performance for apps, streaming, and multi-screen content. These initiatives also strengthened Fixed and Mobile Broadband services for both B2B and B2C customers, delivering faster, more reliable connectivity and optimized content delivery. Our design principle of using standalone switches for cache clusters remained essential for operational simplicity and scalability. Overall, these actions contributed to better resource utilization, lower operational costs, and a consistent quality of experience across diverse platforms and content types. In 2025, we will increase capacity at 14 existing sites due to the increase in data traffic. Network Security Network security is an essential element for the continuity of our operations and the provision of services to our clients, in a context where telecommunications networks are becoming increasingly complex, distributed, and interconnected. As a result, we are exposed to risks related to the integrity, availability, and confidentiality of our network infrastructures and associated systems. Our approach to governance, risk management, and compliance related to network security is aligned with the group's guidelines and policies and is based on widely recognized market frameworks, including information security controls. We continuously seek to enhance our capabilities for protecting, detecting, and responding to security incidents, considering the ever-evolving nature of cyber threats. Throughout our ongoing efforts to strengthen network security, we have implemented and enhanced controls focused on perimeter protection, mitigation of Distributed Denial of Service (DDoS) attacks, and operational resilience, aiming to reduce the likelihood and impact of incidents that may affect service continuity. We also promote the consolidation and evolution of existing tools and processes, as well as the gradual adoption of new solutions aimed at supporting threat intelligence activities, vulnerability management, and data protection. Additionally, we strive to strengthen our organizational capabilities by developing and training technical teams involved in the design, implementation, and operation of security solutions, with a focus on incorporating security principles from the early stages of product and service development. In this context, we adopt secure development practices and methodologies that aim to integrate security requirements throughout the software and digital services life cycle. 58 Table of Contents As part of our risk identification and assessment processes, we conduct periodic internal exercises, such as simulations and controlled tests, to evaluate our incident response capability and identify opportunities for improvement in our security controls and procedures. These exercises aim to contribute to the continuous enhancement of our cybersecurity resilience and defensive capabilities. Despite these efforts, we cannot assure that our network security measures will be sufficient to fully prevent, detect, or mitigate all security risks or incidents. Failures, vulnerabilities, or successful attacks may occur and result in adverse impacts on our operations, service quality, financial condition, and reputation. TV services We offer IPTV services through our FTTH network using an open platform created to revolutionize the delivery of these services. Our open platform consists of Pay TV, with video broadcasting over IP. Several global partners have developed modules in partnership with us to connect to our existing global video platform. Our local team customized the middleware for set-top boxes to create a standardized version that provides better time-to-market for new developments and product launches, as well as enabling future convergence between IPTV and OTT platforms. We integrated various components to create a new IPTV ecosystem, including instant channel switching, retransmission, and applications that enhance user experience. Additional services such as pay-per-view and Video on Demand (VoD) are also available. Furthermore, our IPTV interface was completely redesigned to improve customer experience, and the product was renamed to Vivo TV. In 2025, we introduced new regional channels to the service lineup via streaming and implemented low latency encoding to enhance the customer experience with live sports events. Mobile coverage In 2025, we continued to expand the capacity and coverage of our mobile networks to absorb continuous growth in voice and data traffic. We seek to set ourselves apart from our competitors by significantly growing our 4G and 5G coverage. As of December 31, 2025, our mobile network covered 5,083 municipalities in Brazil using different technologies such as 5G, LTE Advanced Pro, LTE, WCDMA and GSM/EDGE digital technologies, or 91.26% of the total municipalities in Brazil and 98.1% of the Brazilian population. We have the biggest LTE Advanced Pro (commercially known as 4.5G) coverage in Brazil (with 4,141 municipalities and 93.3% population covered). In the same period, we have covered 716 municipalities of Brazil with 5G SA and NSA; these cities together represent 67.7% of the Brazilian population. Since 2015, we started developing network sharing on the 2600 MHz 4G band with other operators; we had coverage in 220 cities using TIM’s network through RAN sharing. In 2017, we also began to develop 3G network sharing with Claro and, as of December 31, 2025, we covered 232 Brazilian cities using shared radio base stations and 137 cities using Claro’s network through RAN Sharing. In 2018, we further began to develop 3G network sharing with TIM, and, as of December 31, 2025, we covered 17 Brazilian cities with shared radio base stations and 27 cities using TIM’s network through RAN sharing. In 2019, we began to develop network sharing in 4G 700 MHz with TIM (as a proof of concept), and, as of December 31, 2025, we covered 10 Brazilian cities with shared radio base stations and 9 cities using TIM’s infrastructure through RAN sharing. In 2019, we entered into a network sharing agreement with TIM for 2G, 3G and 4G technologies, which sought to expand our network and create synergies. As of December 31, 2025, we covered 363 Brazilian cities with shared 3G/4G radio base stations and 353 cities using TIM’s infrastructure through RAN sharing. From 2021 until December 2025, 3G/4G Single Grid was deployed in the urban area of 238 cities by Vivo and 238 cities by TIM. Also in 2025, 2G Single Grid was deployed in 1,054 cities by Vivo and 780 cities by TIM aiming to accelerate the switch-off of legacy networks. RAN network sharing allows us to fulfill the ANATEL obligations that were imposed on us as part of our spectrum acquisitions and reduces network deployment and maintenance costs to provide additional coverage at lower costs. 59 Table of Contents Fraud detection and prevention During 2025, we continued our efforts to combat fraud, focusing on the two main types, as follows: •Subscription fraud: This type of fraud occurs when one or more services are provided without the consent of the true “owner,” with the primary goal of acquiring products and services, causing financial losses. In 2025, we recorded a 40% reduction in fraud-related losses, decreasing from R$85.5 million in 2024 to R$51.2 million in 2025, mainly due to actions focused on prevention in Fixed B2C FTTH. Other additional actions that contributed to this reduction included the identification of new fraud scenarios through investments in security layers and anti-fraud intelligence rules, which allowed us to detect larger volumes of fraud in less time (through biometrics, device behavioral analysis, fraud detection and prevention tools, machine learning rules, among others), as well as continuous improvement of existing rules and the ongoing review of prevention and detection processes. •SIM Swap Fraud: this type of fraud is characterized by the alteration of the SIM card (ICCID) without the authorization or knowledge of the line holder. Its purpose is to use the line to generate irregular traffic through national, international, and roaming calls, as well as to criminally access customers’ personal information, which often has value in cases of extortion, theft, and online scams. We had a 47% increase in cases in 2025, rising from 365 cases in 2024 to 537 in 2025. This increase was related to identified systemic vulnerabilities and accesses by unauthorized profiles, whose mitigation actions, such as mandatory biometrics and process improvements, were addressed and prioritized. Awareness campaigns were carried out, constant updates to parameters and rules were made, and the root cause was identified for better detection, prevention, and handling of fraud. Operating Agreements Interconnection agreements The terms of our interconnection agreements include provisions with respect to the number of connection and signaling points. See “—Regulation of the Brazilian Telecommunications Industry—Interconnection Fees” and “Item 4. Information on the Company—B. Business Overview—Rates, Taxes and Billing—Interconnection fees.” We believe that we have adequate interconnection agreements with fixed-line and mobile operators necessary to provide our services and that we have all the necessary interconnection agreements with long-distance carriers. Roaming agreements We provide international GSM roaming in over 200 destinations worldwide by means of over 500 roaming agreements with local service providers. We have a roaming agreement with MTN Irancell, or Irancell. During 2025, we recorded US$17.13 in roaming revenues and zero expenses payable to Irancell under this agreement. See “—C. Organizational Structure—Disclosure Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act” for further information. Network sharing agreement In December 2019, Telefônica Brasil and TIM entered into two network sharing agreements regarding electronic equipment and mobile sites on 2G, 3G and 4G networks, in order to (i) decommission outdated technology; (ii) 4G coverage expansion; and (iii) gain spectrum and cost-efficiency. Both agreements were approved by ANATEL and CADE. In August 2024, Telefônica Brasil and TIM signed two amendments with the aim to expand the number of cities covered by both the agreements. The amendments were submitted for regulatory approval by ANATEL and CADE. On October 22, 2025, CADE granted partial approval, in accordance with the applicable concentration control agreement. The matter remains under Anatel’s review and is pending final approval. 60 Table of Contents In December 2020, Telefônica Brasil and Claro S.A entered into a network sharing agreement in which the parties had agreed to share 81 of our mobile sites with Claro. The agreement was approved by ANATEL and CADE. The approval of the aforementioned agreements, however, does not exempt the providers from fulfilling their obligations, nor from the coverage of the entire area. In the case such agreements are terminated before the expected deadline, each provider must meet its coverage commitments with its own network, under the penalty of extinction of the use of radio frequencies’ authorizations. See also “—Mobile coverage” above for further information on our network sharing. Competition Competition in the fixed and mobile markets continued to be intense in 2025. Faced with the high demand for connectivity, Brazilian telecoms have focused on modernization and innovation as levers to remain competitive in the market. The leading companies have been directing efforts and investments toward the digital transformation of business operations, aiming to improve the balance between customer growth and loyalty, revenue growth and margins. For these reasons, the major operators accelerated the 5G coverage, rolled out fiber and continued to include value-added services in the offers in order to differentiate their mobile and fixed portfolios. In addition, telecommunication companies began to leverage their customer base, billing and other key assets to engage in other revenue streams, alone or in partnerships with companies from other sectors. The initiatives remain in their initial steps and range from financial services, to healthcare, education and B2B solutions. The Brazilian consumer market is increasingly knowledgeable and demanding, expecting not only the best service delivery, as well as the best cost-benefit. Therefore, operators have prioritized the expansion and digitalization of company-customer interactions. In the mobile market, we continued to lead in market share, with a 38.1% share according to information from ANATEL as of December 31, 2025. This year, the competition remained intense in 4.5G and 5G network coverage expansion and subscriber growth. We lead the mobile market in 13 states: Amapá, Amazonas, Bahia, Ceará, Espírito Santo, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Pará, Rio Grande do Sul, Roraima, São Paulo and Sergipe. Claro Brasil or Claro is a mobile operator controlled by the Mexican company America Móvil Group, and leads mobile service in nine states: Acre, Distrito Federal, Goiás, Maranhão, Piauí, Pernambuco, Rio de Janeiro, Rondônia and Tocantins. TIM, a Brazilian telephone company and a subsidiary of Telecom Italia, leads the mobile market in five states: Alagoas, Paraná, Paraíba, Rio Grande do Norte and Santa Catarina (according to ANATEL as of December 2025). On the fixed-line services, the wireline and pay-TV services reported net disconnections, according to ANATEL. In broadband, the market continued to expand mainly in ultra-broadband, fiber accesses. Our main competitors in fixed telecommunications services are Claro (which includes its Claro and Embratel services) and Nio, which is stronger in the fixed-line services outside the State of São Paulo. TIM (a subsidiary of Telecom Italia) also offers fixed broadband services, while SKY, which is currently controlled by the Argentine conglomerate Werthein, has pay TV and broadband services (4G LTE TDD). In addition, we have competition from thousands of regional service providers throughout Brazil. 61 Table of Contents Environment, Social and Governance In 2025, Telefônica Brasil continued to strengthen its purpose of ‘Digitalize to Bring Closer’ through its strategic pillars, including ‘Futuro Vivo’ (Vivo Future) pillar, which integrates digital transformation sustainability. This approach reinforces actions aimed at driving technological innovation with a focus on environmental and social responsibility, generating positive impacts for society and the planet. This ESG strategy is monitored through more than 100 indicators consolidated by the Board of Directors through the Quality and Sustainability Committee, via the Responsible Business Plan (PNR, its acronym in Portuguese), with targets for 2025–2027 aligned with the Sustainable Development Goals (SDGs). This strategy is deployed through internal structures that ensure its dissemination across the organization, including specific committees for ESG agendas with senior management: (a) Quality and Sustainability Committee which reports to the Board of Directors an includes independent members of the Board of Directors and (b) Sustainability Committee, which reports directly to the CEO and the Executive Directors. As of December 31, 2025, our Board of Directors was comprised of 83% independent members and 33% women. ESG commitments are included in variable compensation. Since 2019, 20% of short-term executive and employee compensation has been linked to ESG targets, currently associated with customer perception (NPS), gender equality (women in leadership) and climate change (GHG emissions). Since 2022, executives’ long-term Performance Plan includes Telefônica Brasil (VIVT3) with cash settlement. The incentive has clawback rules and 10% of compensation linked to ESG targets related to climate change and gender equality. Our Climate Strategy is presented in the Climate Action Plan, a document approved by the Board of Directors and overseen by the Quality and Sustainability Committee. In line with commitment to achieve net zero emissions by 2035—five years earlier than previously planned—we have implemented actions focused on three main areas: •Mitigate impact: since 2023, we have maintained a 90% reduction in greenhouse gas (GHG) emissions (scope 1 and 2), consistent with the objectives of our Net Zero plan. To achieve this, we have adopted strategies such as: reducing fuel consumption, fusing renewable fuels in our fleet, investing in electric vehicles, modernizing air conditioning systems, implementing leak controls and replacing of some refrigerant gases, low-carbon purchasing, and sourcing 100% of the electricity from renewable sources. Telefônica Brasil also operates a Renewable Energy Plan and an Energy Efficiency Program, with highlights to the Distributed Power Generation program, which gradually install solar, hydro and biogas power plants across Brazil. Since 2019, we have offset 100% of operational emissions through carbon credits that prevent deforestation and restore Brazilian forests. Through the Supply Chain Engagement Carbon Program, we engage carbon-intensive suppliers to measure and manage emissions, seek reduction alternatives, and make a voluntary climate commitment, contributing to our Scope 3 reduction target. •Leverage Opportunities: digital solutions have the potential to decarbonize various value chains. In the B2B segment, through GUD Energia, we facilitate access to renewable energy sources such as hydroelectric, wind and solar, generating financial and environmental benefits for companies seeking to optimize their costs and meet sustainability challenges. We also offer products and services with the Eco Smart seal, verified by a third party, which allows companies to know the environmental benefits that the solution can generate. •Adapt to Risks: climate risks are integrated into our overall risk assessment, with periodically qualitative and quantitative evaluations considering the physical and transition risks. We maintain a Global Crisis Management System to address high impact threats, covering of 100% of nationwide critical operations. 62 Table of Contents As part of Telefônica Brasil’s biodiversity strategy, in 2025, we launched the “Floresta Futuro Vivo” project, reinforcing its commitment to biodiversity. In partnership with re.green, a leading reference in large-scale ecological restoration, the initiative aims to recover and protect approximately 800 hectares of forest within the Gurupi-Turiaçu Mosaic, located between Maranhão and Paraná, with the regeneration and conservation of 900,000 trees from 30 native species over the next 30 years. The initiative seeks to reconnect forest fragments, restore ecological functions, and protect endangered species such as the Ka’apor capuchin monkey (Cebus kaapori). The restoration process involves applied science and combines natural regeneration, seed collection, and monitoring technologies to track seedling growth. In addition, the project is expected to generate around 116,000 tons of carbon credits, reinforce the Company’s decarbonization strategy. Since 2006, collection points for the proper disposal of electronic waste have been offered through the Vivo Recicle Program, which has already collected millions of items. In 2025, through our partnership with Fundação Telefônica Vivo, a game between students was held in public schools and institutions, collecting about 29 tons of electronic waste and involving 24,000 children, young people, and teachers. Through the Vivo Renova Program, customers receive discounts for exchanging their cell phones upon delivery of the used device, which can either be resold (extending its useful lifecycle) or disposed of properly. In the fixed-line business (broadband, voice, and TV), customers can schedule home collection or return their used modems or decoders at our stores, where they are refurbished and reused or recycled. As part of our circular economy strategy, we aim to achieve zero waste from operations by 2030, prioritizing the reuse, repair, recycling and reduction of waste material. In addition, we have set a long-term goal to collect a total of 375 tons of electronic waste by 2035. Digitalization promotes social inclusion and efficiency in the use of environmental resources. To enhance these benefits, we invest in strengthening our mobile network and expanding our fiber network. A range of solutions are offered in areas such as health (Vale Saúde), education (VivaE), banking and access to credit (Vivo Pay) and renewable energy (GUD Energia). These areas are also supported through Corporate Venture Capital (CVC) funds: Wayra, focused on early-stage startups, and Vivo Venture, focused on growth startups. Digitalization is also part of the purpose of Fundação Telefônica Vivo focuses on contributing to digital inclusion and the development of digital skills for educators and students in Brazilian public schools. To this end, we offer continuing education programs, with an emphasis on technology and mathematics, for educators working in early school years. In addition, we support the expansion of technical and vocational education in technology within the public school system contributing to the employability of technical high school students. We participate in movements and coalitions that discuss and promote systemic strategies and public policies with the government, aiming to expand the inclusion of digital technologies in education. Racial equity is a cross-cutting theme in all our initiatives and projects. We also promote Corporate Volunteering, an initiative that sensitizes and engages Vivo employees in in-person and digital activities that generate social impact. More than 2 million people have benefited from these actions. We have actions to attract and retain talent and invest in employee training, including technical certifications and subsidies for professional specialization. Processes for performance evaluation, talent mapping and identification of successors are also implemented. Our diversity program focuses on four groups: Gender, Race, LGBTI+ Community and People with Disabilities, as well as other topics covered in our Global Diversity and Human Rights Policy. We are committed to setting goals to these groups with actions such as: affinity groups, mentoring, development programs, recruitment practices and literacy initiatives. In line with long-term commitments, we aim to achieve by 2035: 40% women in senior leadership position, 45% women in executive leadership positions, 40% black professionals in leadership positions, and 45% black representation across the company. To support these objectives, 50% of trainee, internship and young apprentices positions are allocated to black candidates. Another highlight is Women in Fiber (Mulheres de Fibra) program, which promotes female participation in technical areas that were previously dominated by men. 63 Table of Contents In addition, the Telefônica Responsible Business Principles establish the core values applicable to all employees, suppliers and other stakeholders. Human rights aspects are monitored through biannual risk assessments, in accordance with the Telefónica Group’s Enterprise Risk Management process. For suppliers, the Parceiro Plural program was launched to, and ensure that partners share the same values as the company in regarding ESG issues and to promote continuous development. Our commitment to ethics, integrity and transparency is reinforced through the Compliance Program (#VivodeAcordo) and the Privacy and Data Protection Governance Program (#VivoCuidandodaPrivacidade). Customers can access more detailed information about their rights and our personal data management practices through the Privacy Center website and the local Privacy Notice. The digital security strategy is monitored by senior management through: (a) a dedicated management structure with a Chief Security Officer (CSO) and a Chief Information Security Officer (CISO), (b) a Digital Security Risks Executive Committee, and (c) the periodic review of the digital security strategy by a Board of Directors’ independent director. Several cyber risk management actions are applied, such as annual cyber war games and training initiatives. Aligned with best practices, we maintain significant standards and certifications: ISO 26000 (Social Responsibility), ISO 14001 (Environmental Management), ISO 27001 (Information Security), ISO 45001 (Occupational Health and Safety), ISO 50001 (Energy Management and DSC 10000 (Compliance). Our strategy enabled Telefônica Brasil to be included in the Dow Jones Best-in-Class World Index, remaining the only Brazilian telecom company in the index, the leader in the Americas and among the best-performing companies in the sector worldwide. The Company is recognized as a leader in the Corporate Sustainability Index (ISE B3) and is ranked among the Top 10% in The Sustainability Yearbook 2025. Additional information on our ESG strategy and actions are detailed in our Annual Integrated Report, available at: https://ri.telefonica.com.br/en/esg/sustainability-reports. The information on our website is not included or incorporated by reference in this annual report on Form 20-F. Regulation of the Brazilian Telecommunications Industry Our business, including the services we provide and the rates we charge, is materially affected by comprehensive regulation under the General Telecommunications Law and various administrative rules thereunder. We operate under authorization agreements for voice, mobile, data and Pay TV services in all Brazilian states. See “Item 3. Key Information—D. Risk Factors—Risks Relating to Our Business and Industry—Our authorizations contain certain obligations, and our failure to comply with these obligations may result in various fines and penalties being imposed on us by ANATEL.” ANATEL is the regulatory agency established by the General Telecommunications Law and is administratively and financially independent from the Brazilian government. Any proposed regulation by ANATEL is subject to a period of public comment and, occasionally, public hearings, and its decisions may be challenged in Brazilian courts. Concessions and authorizations In accordance with the General Telecommunications Law, concessions are licenses to provide telecommunications services granted under the public regime, while authorizations are licenses to provide telecommunications services granted under the private regime. Both concessions and authorizations licenses are subject to several obligations regarding, for instance, quality of service, as well as network expansion and modernization. Nonetheless, companies that provide services under the public regime, known as the concessionaires, are subject to additional obligations as to continuity and universality of service. 64 Table of Contents On October 4, 2019, the New General Telecommunications Law was enacted. This law revises the telecommunications regulatory framework and represents a significant impact on this industry. For more information about the New General Telecommunications Law, see “—Other regulatory matters—Updated regulatory framework.” On April 11, 2025, Telefônica Brasil signed the unified authorization term with ANATEL, that compiles all previous licenses into one single title, finalizing the migration to the authorization regime. Obligations of telecommunications companies Under the authorizations framework, we and other telecommunications providers must comply with obligations related to service quality, network expansion, and modernization. Failure to comply with telecommunications regulations or any obligations established by ANATEL may result in fines of up to R$50 million per infraction. As of the date of this annual report, our operations are regulated as follows: •Local and long-distance fixed-line voice services (or STFC services). We operate under a nationwide authorization; •Mobile voice and mobile broadband services, in all 26 states and the Federal District, under the personal mobile service (Serviço Móvel Pessoal – SMP) authorizations; •Fixed broadband and Multimedia communication services, such as audio, data, voice and other sounds, images, texts and other information throughout Brazil. We operate under a nationwide SCM authorization, valid for an indefinite term; •Pay TV services, throughout all regions of Brazil under the conditioned public service (Serviço de Acesso Condicionado), or SeAC authorization. We operate a SeAC authorization, which is valid for an indefinite term; •Private Limited Services – SLP, which accounts for the provision of telecommunication services in the private regime, intended for network building and specific groups of users defined by the provider and which covers multiple applications, including data, video, audio, voice and text communication; and •Wholesale services, such as interconnection, governed by the interconnection agreements discussed under “—Operating Agreements—Interconnection Agreements,” Roaming and MVNO agreements, which are described under “—Operating Agreements—MVNO Agreements” (Interconnection and Roaming are also regulated by the Competition Goal General Plan (Plano Geral de Metas de Competição), hereinafter referred to as PGMC. We set forth below details of the authorizations, licenses and regulations that regulate our operations. Quality regulations in Brazil In December 2019, ANATEL approved RQUAL, which changes the way the agency monitors the performance of telecommunications operators. In addition to promoting quality indicators increasingly associated with consumer experience and the widespread dissemination of results, the concept of responsive regulation was introduced, encouraging advanced corrective actions to address problems rather than solely imposing fines when goals are not met. Annual “seals” from “A” to “E” in each municipality, state, and Brazil will be awarded with quality measurements based on three indices: technical quality of service, perceived quality, and user complaints. If a provider experiences a deterioration in a municipality, resulting in a seal of “D” or “E” compared to the previous year, customers may terminate their contracts without paying loyalty penalties. 65 Table of Contents An independent entity, the ESAQ, inspected by ANATEL and funded by the providers, measures the quality of services. All measurements are based on a document called the DVR (Reference Values Document), which is issued following RQUAL and reviewed every two years. The actual version of DVR was published on December 27, 2024, and was applied to measurements beginning in 2025. The first seals were published in December 2025. Mobile services In October 2016, ANATEL approved new spectrum use regulations, which facilitate access to radio frequencies and generates efficiency in its use, due to the simplification of procedures and necessary documentation. The regulation also alters spectrum pricing (for non-bidding grants), rules for extending use authorization and new rules for frequency use on a secondary basis prior to primary use. In July 2018, ANATEL approved Resolution No. 695, which establishes new spectrum pricing regulations, with calculation methods and conditions for spectrum reserve prices and renewal costs. This new regulation took effect in May 2019. In November 2018, ANATEL approved Resolution No. 703, which establishes new spectrum cap regulation. There are two groups of bands with specific limits for a given area: •Frequencies up to 1 GHz: each operator may hold up to 35% of the bands; •Frequencies between 1 GHz and 3 GHz: each operator may hold up to 30% of the bands. These limits can be extended by up to 40%, through competitive constraints that may be imposed by ANATEL. For frequencies above 3.0 GHz, the limits were determined in the specific auction terms as follows: •3.5 GHz frequency (between 3.3 and 3.7 GHz): each operator may hold up to 100 MHz of the band; •26 GHz frequency (between 24.3 GHz and 27.5 GHz): each operator may hold up to 1 GHz of the band. In November 2023, ANATEL conducted a public consultation to revise the Spectrum Usage Regulation (“RUE”), approved by Resolution No. 671/2016. According to the proposal, Resolution No. 695/2018 would be revoked, and the regulations associated with the valuation of radio frequency spectrum usage authorizations would be consolidated in the new RUE. Additionally, the proposal alters the conditions for authorizations to use spectrum on a secondary basis. The new regulation is expected to be approved in the first half of 2026. In December 2025, ANATEL approved Resolution No. 785/2025, which stipulated a long-term plan for spectrum auctions (between 2026 and 2036). Mobile service licenses (SMP) Previously, spectrum authorizations were valid for 15 years and could only be renewed once. Although the recently approved New General Telecommunications Law permits successive spectrum renewals, we cannot guarantee that our existing licenses will be renewed. According to the New General Telecommunications Law and to Decree No. 10,402/2020, ANATEL must consider specific conditions for the renewal of our existing licenses on the grounds of efficient spectrum use, competition issues or public interest. 66 Table of Contents Our current 850 MHz authorizations will expire in 2028. In November 2020, ANATEL has decided to renew our current authorizations for the use of radio frequencies in A band, on a primary basis, until November 29, 2028. However, the specific conditions for renewal, including those related to economic valuation criteria and related obligations, were challenged by the affected service providers, including us. After ANATEL rejected complaints presented by the providers, a final disposition of the matter is still pending and will require a decision by the TCU. In April 2023, ANATEL determined that our authorizations in the 900 MHz band should not be extended (except in the state of Minas Gerais), claiming that the efficient use of this spectrum had not been properly demonstrated, since the low capacity associated this band (2.5 + 2.5 MHz) imposes limitations on its effective use. The non-renewal of these 900 MHz licenses, however, does not affect the services currently provided by the Company. Also in April 2023, ANATEL decided to renew our 1,800 MHz licenses until 2032. In August 2023, ANATEL further renewed our 900 MHz and 1,800 MHz licenses in part of the state of Minas Gerais (PGO sector 2) until 2032. It is worth noting that our licenses in the remaining parts of the state of Minas Gerais (PGO sector 3) had already been renewed by ANATEL in April 2020 and are set to expire in 2035. Furthermore, in April 2023, ANATEL decided to renew our current license authorizations for the use of 2,100 MHz radio frequencies until April 2038. As these were first-time renewal requests provided for in the contracts and bidding processes that originally granted these authorizations, TCU’s technical division did not identify evidence of non-rational or inappropriate use of these bands by the Company that would justify denying the extensions. However, they highlighted the need to adapt Article 31 of Resolution No. 757/2022 to align with the new proposed maximum validity terms. On February 3, 2025, Resolution No. 757/2022 was revoked by Resolution No. 773/2025, which approved new Regulation for Radio Frequencies Conditions of Use. On February 5, 2025, TCU approved the renewal of 2,100 MHz authorizations, as originally proposed by ANATEL. This approval was formalized through Ruling No. 224/2025 (“Acórdão nº 224/2025 – TCU – Plenário”). If the licenses mentioned above are not renewed, we may be required to compete for new licenses in a spectrum auction. For authorizations acquired prior to the 5G auction that took place in 2021, their first renewal requires payment of 2% of net operating revenues earned in the region included in the authorization, every two years for the duration of the extension period. For some licenses, we must also pay 1% of the aforementioned amount in the 15th year. For subsequent periods and all other authorizations, ANATEL determined that the amount due for the extension must be calculated based on net present value (“NPV”) parameters, in order to reflect, according to the Agency, the real economic value (market value) of the sub-bands. In addition, part of the payment should be converted into investment commitments. It should be noted that, according to the TCU's interpretation of Law No. 13,879/2019, requests for extension must be assessed from the perspective that a new spectrum bidding is the rule and that, if ANATEL intends to approve the extension requested by the provider, it must prove compliance with the conditions set forth in Decree No. 10,402/2020. In this context, ANATEL admitted the second extension of the 900/1800 MHz (in Minas Gerais) and 850 MHz (several states) bands, currently under evaluation by the TCU. 67 Table of Contents Our SMP authorizations include the right to provide mobile services for an unlimited period but restrict the right to use the spectrum according to the schedules listed in the respective radiofrequency authorizations. The table below sets forth our current SMP authorizations, their locations, band and spectrums, date of issuance or renewal and date of expiration: Region Frequency Bandwidth (MHz) Notes Year of Exp. Date Notes Brazil(1) 700 MHz 20 2029 Brazil(1) 850 MHz 25 (2) 2028 (3) Brazil(1) 900 MHz 5-10 (4) 2031–2035 (5) Brazil(1) 1.8 GHz 20-80 (6) 2031–2035 (5) Brazil(1) 2.1 GHz 30-60 (6) 2038 Brazil(1) 2.3 GHz 40–50 (7) 2041 Brazil(1) 2.5 GHz 40 (8) 2027–2031 (9) Brazil(1) 3.5 GHz 100 2041 Brazil(1) 26 GHz 600 2041 (1)Telefônica Brazil uses high and low frequencies spectrum in all regions of Brazil. (2)States of Acre, Amazonas, Amapá, Bahia, Distrito Federal, Espírito Santo, Goiás, Maranhão, Minas Gerais, Mato Grosso do Sul, Mato Grosso, Pará, Paraná, Rio de Janeiro, Rondônia, Roraima, Rio Grande do Sul, Santa Catarina, Sergipe, São Paulo, and Tocantins (except for PGO Sectors 3, 22, 25, 30 and 33). (3)Current licenses expire in 2028. ANATEL decided to limit their renewal up to 2028, due to a future mandatory refarming process. (4)10 MHz in the State of Minas Gerais; 5 MHz in the States of Amazonas, Roraima, Amapá, Pará, Maranhão, Bahia, Sergipe, and São Paulo (except municipalities within area code 11). (5)Regional licenses: expiration and renewal dates depend on the region. (6)Bandwidth varies by region. (7)50 MHz in the southeast region of Brazil (except for the state of São Paulo and PGO Sector 3); 40 MHz in the state of São Paulo (except for PGO Sector 33); and in the north and mid-west regions of Brazil (except for PGO Sectors 22 and 25). (8)40 MHz is the most common bandwidth, but such bandwidth can rise up to 60 MHz in some regions. (9)Band X will expire in 2027 and Band P will expire in 2031. In 2013, we changed the terms of our authorizations regarding Band “L” (1.9 GHz) in certain locations, adapting their blocks of frequencies to 2.1 GHz and aligning them with the Band “J” (3G), which enables more efficient use of the spectrum. In 2018, this alignment process was completed at the national level with respect to the following areas: Northeast region, with the exception of Bahia and Sergipe; Pelotas, Morro Redondo, Capão do Leão and Turuçu, in Rio Grande do Sul; Buriti Alegre, Cachoeira Dourada, Inaciolândia, Itumbiara, Paranaiguara and São Simão, in Goiás; Altinópolis, Aramina, Batatais, Brodowski, Buritizal, Cajuru, Cássia dos Coqueiros, Colômbia, Franca, Guaíra, Guará, Ipuã, Ituverava, Jardinópolis, Miguelópolis, Morro Agudo, Nuporanga, Orlândia, Ribeirão Corrente, Sales de Oliveira, Santa Cruz da Esperança, Santo Antônio da Alegria and São Joaquim da Barra in São Paulo; and Paranaíba in Mato Grosso do Sul. This change is foreseen in the bidding document No 001/2007. We do not have Band “L” in the states of Amazonas, Roraima, Amapá, Pará and Maranhão and in the cities of Londrina and Tamarana, Paraná. In 2012, Telefônica acquired 40MHz on the 2.5GHz to 2.69GHz frequencies for the amount of R$ 1.05 billion. In order to meet the coverage requirements imposed by ANATEL, we had the obligation of implementing 4G coverage in 1,094 cities by December 31, 2017. The remaining coverage commitments in cities with less than 30,000 inhabitants could be fulfilled with other frequency bands until December 31, 2019. After completing the associated inspection process, ANATEL confirmed our full compliance with such commitments. Currently, we have made 4G services available in 5,199 municipalities. Telefônica has deployed and continues to deploy 4G coverage by serving its customers through the use of its own network or by established agreements of RAN-sharing approved by ANATEL. 68 Table of Contents We also have the obligation to meet voice and data demand in remote rural areas, defined in the bidding process of the 2.6 GHz band. As a commitment, we are required to provide infrastructure and service operating in any frequency band in rural areas in the states of Alagoas, Ceará, Minas Gerais, Paraíba, Pernambuco, Piauí, Rio Grande do Norte, Sergipe, and countryside of São Paulo, for a total of 2,556 municipalities. In these areas, we are also required to provide free broadband to schools located in rural areas. Regarding the 700MHz spectrum, ANATEL has allocated the band for the provision of fixed-line, mobile and broadband services. On September 30, 2014, we acquired 20 MHz (10+10 MHz) with nationwide coverage, for R$1.92 billion, at the minimum price, plus R$904 million for the band cleaning (migration of broadcasters that currently occupy the band and interference management). According to the auction rules, the winning bidders are responsible for financing and managing the band cleaning process (Analog TV switch off) which was implemented through a legal entity specifically incorporated for this purpose, as set forth in the bidding process and applicable regulations (EAD). Since June 2019, all Brazilian municipalities are ready to activate LTE coverage in the 700 MHz band. In November 2020, ANATEL attested that 9 out of 17 obligations have been fulfilled by the operators. According to the Agency, the other obligations would either be concluded in 2020 or were linked to activities that still need to be carried out, however, this situation does not imply any type of noncompliance on the part of the operators in relation to what should have been done. In December 2015, ANATEL auctioned the remaining spectrum lots in the 1,800 MHz, 1,900 MHz and 2,500 MHz bands, from which Telefônica acquired seven lots of 2.5 GHz frequency band offering a total of R$ 185.4 million. These lots are associated with six different States, in the capital cities of the States of São Paulo, Rio de Janeiro, Porto Alegre, Florianópolis, and Palmas, and one countryside city of the State of Mato Grosso do Sul. Such frequencies are already being used for the provision of mobile broadband service on 4G. In November 2021, ANATEL held the largest spectrum auction in its history, which included 4G and, for the first time, 5G blocks, with 700 MHz, 2.3 GHz, 3.5 GHz and 26 GHz lots. On that occasion, we acquired 3.5 GHz and 26 GHz national licenses (100 MHz and 600 MHz bandwidths, respectively). We also won regional 2.3 GHz licenses, with 50 MHz bandwidth in the southeast region of Brazil (except for the state of São Paulo and PGO Sector 3) and 40 MHz bandwidth in São Paulo state and in the north and mid-west regions of Brazil (except for PGO Sectors 22 and 25). These acquired licenses, which we purchased for a total of R$4.45 billion, of which R$0.93 billion is related to licenses and the remaining amount is related to the obligations ANATEL established. The licenses ensure we have the required spectrum to provide 5G services, and are valid for 20 years (renewable under the then-existing legal conditions at the expiration of this term). In 2022, as widely reported, the Company acquired part of Oi’s mobile assets, resulting in additional spectrum authorizations in the 900, 1,800, and 2,100 MHz bands. These assets were grouped into a special-purpose entity called Garliava RJ Infraestrutura e Redes de Telecomunicações S.A., which was fully merged with and into the Company in 2023. Multimedia communication service Our multimedia services include broadband in several technologies, including fiber services. We have assumed in the past the obligation to provide free Internet access to public schools in the area comprising in our concession area during the term of our concession agreements. This obligation was terminated in December 2025. Pay TV services We are authorized to provide Pay TV Services (Serviço de Acesso Condicionado), or SeAC, throughout Brazil by means of different technologies (Fiber, DTH and coaxial). 69 Table of Contents Law No. 12,485/2011 established the most important aspects of this service, including the imposition of minimum national content requirements, carrier obligations and rights and cross-ownership restrictions. Since 2019, the Brazilian Congress has been discussing bills amending SeAC law. Among the proposals is the review of limitations to cross-control between telecom providers and content producing and programming companies. Regulatory asymmetries between SeAC and OTT services are also under debate. Interconnection fees In accordance with ANATEL regulations, we must charge fees to the other telecommunications service providers based on the following: •a fee for the use of our local, fixed-line service network (the TU-RL): we charge local service providers an interconnection fee for every minute used in connection with a call that either originates or terminates within our local network, with the exception of calls between other providers of local, fixed-line service, for which a fee is not charged; •a fee for the use of our long-distance, fixed-line service network (the TU-RIU): we charge long-distance service providers an interconnection fee on a per-minute basis only when the interconnection access to our long-distance network is in use; •a fee for the use of the mobile network (the MTR): we charge mobile service providers an interconnection fee on a per-minute basis only when the interconnection access to our mobile network is in use; and •a fee for the use of leased lines by another service provider (EILD): we also lease transmission lines, certain infrastructure and other equipment to other providers of telecommunications services. For more information, see “Item 3. Key Information—D. Risk Factors—Risks Relating to the Brazilian Telecommunications Industry and Us—Our results of operations may be negatively affected by changes to STFC or SMP rules.” Fixed-line services In July 2005, ANATEL published new rules on interconnection. The main changes are: (i) an obligation to have a public offering of interconnection for all services, in addition to interconnection fees between providers of fixed-line and mobile telephone services; (ii) an obligation by internet backbone providers to publicly offer interconnections; (iii) the establishment of criteria for the treatment of fraudulent calls; and (iv) a reduction of service times for interconnection requests. In 2006, we completed the implementation of interconnection with mobile service providers in regions with heavier traffic, ensuring proper billing for such calls. This reduced interconnection costs. In 2007, ANATEL published a new version of its fixed-line network compensation regulation, which changed the rules used to calculate interconnection fees. Local and long-distance fees, which were hitherto fixed, became variable fees according to the rules for public service fees. A 20% increase was applied to fees for mobile service operators without significant market power in their regions. On May 7, 2012, ANATEL Resolution No. 588/2012 was published, which set forth the following: •a maximum of two minutes of interconnection should be paid for the use of the local network on reduced hours; •a reduction of interconnection fees from domestic and international long-distance calls by 30% of the TU-RL, and a reduction of 25% (until 2012) and 20% (as of 2013) of the TU-RIU; •The remuneration between networks will not occur until this traffic imbalance is greater than 75% compared to 25%; and 70 Table of Contents •The partial Bill & Keep by December 31, 2013 and full Bill & Keep by December 31, 2014. On July 1, 2014, ANATEL decided to gradually decrease the TU-RL, and the TU-RIU based on a bottom-up cost model by setting maximum rates for fixed-line interconnection fees for the years 2016 through 2019. In December 2018, ANATEL set the fixed-line interconnection fees ranging for the years 2020 through 2023. Further, in March 2023, ANATEL set the new fixed-line interconnection fees ranging for the years 2024 through 2027, as shown in the table below for our STFC sector (Sector 31) in reais): Interconnection fees for Sector 31 Year TU-RL TU-RIU1 TU-RIU2 2024 0.00598 0.00725 0.00655 2025 0.00604 0.00732 0.00663 2026 0.00610 0.00741 0.00671 2027 0.00617 0.00749 0.00680 In December 2016, ANATEL held a public consultation to discuss a new interconnection regulation (Regulamento Geral de Interconexão). These rules were eventually enacted in July 2018 through Resolution No. 693. The new rules seek to resolve a large number of disputes in agreements for voice and data traffic among telecom companies. In the case of a default, interconnection services can be cut without ANATEL’s prior authorization. In addition, the rule sets forth a list of prohibited practices in interconnection relationships and makes interconnections technology-neutral. Mobile service In November 2009, ANATEL unified the licenses of all mobile operators, resulting in the consolidation of interconnection fees and reducing the number of fees for the use of the mobile network from two to one. On July 1, 2014, ANATEL decided to gradually decrease the MTR, based on a cost model for the years 2016, 2017, 2018 and 2019. In December 2018, ANATEL established the reference values for the MTR for the years ranging from 2020 until 2023. Further, in March 2023, ANATEL established the reference values for the MTR for the years ranging from 2024 until 2027, as shown below per region in the General Authorization Plan (Plano Geral de Autorizações), or PGA, in reais: Year PGA Region I PGA Region II PGA Region III 2024 0.01472 0.01599 0.01738 2025 0.01503 0.01650 0.01779 2026 0.01499 0.01686 0.01779 2027 0.01497 0.01632 0.01804 In addition, on December 2, 2013, Act No. 7,272 was published, which set the MTR reference values for PMS providers and became effective on February 24, 2014. On August 28, 2014, Act No. 7,310 replaced the reference values previously set out in Act No. 7,272. In addition, the PGMC determined that in the relationship among PMS and non-PMS providers in the mobile network, the interconnection fee should be paid only when the traffic out of a network in a given direction is greater than 80% of the total traffic exchanged until February 23, 2015; and 60% of the total traffic exchanged from February 24, 2015 to February 23, 2016. Since February 24, 2016, the MTR is owed to the mobile service provider when its network is used to originate or terminate calls (full billing). These conditions were further modified by ANATEL in February 2015, after public notice and comment. In July 2018, ANATEL amended the PGMC and modified the rules on interconnection fees to be paid for outbound traffic, as follows: •From January 1, 2013 to February 23, 2015: 80% / 20%; 71 Table of Contents •From February 24, 2015 to February 23, 2016: 75% / 25%; •From February 24, 2016 to February 23, 2017: 65% / 35%; •From February 24, 2017 to February 23, 2018: 55% / 45%; and •From February 24, 2018 onwards: 50% / 50%. In September 2025, ANATEL approved the new PGMC through Resolution no. 783/2025 and kept the Bill and Keep 50%/50% as a rule for PMS providers in their relationship with non-PMS providers. EILD On May 18, 2014, ANATEL approved the proposed standard for setting maximum values of Industrial Dedicated Line (EILD), based on Cost Models. Values for EILD were published through Act No. 6212, which contains a single reference table that is valid from 2016 until 2019. In addition, the general competition plan requires companies with significant market power to present a public offer every six months informing standard commercial conditions, which is subject to approval by ANATEL. On December 17, 2018, ANATEL approved through Act No. 9,920 a revision of the EILD reference table, valid for 2020 onwards. On March 28, 2023, ANATEL approved through Act No. 3.248 a new revision of the EILD reference table, valid from February 25, 2024 until 2027. Since the approval of the new PGMC, EILD is no longer a regulated wholesale market, although contracts entered into during the period in which it was must be fulfilled. Mobile Virtual Network Operator (MVNO) In 2001, ANATEL approved rules for companies to be licensed as MVNOs. In 2016, ANATEL authorized MVNO companies to be affiliates of other certain network operators, and for that reason, we have signed agreements with companies authorized to operate as an MVNO in Brazil. Brazilian MVNO regulations allow two operating models: “authorized” (in which MVNO holds its own SMP authorization but operates under an MNO’s network) and “accredited” (in which the company doesn’t hold an SMP authorization and acts as an MNO’s representative and offers services jointly). In August 2019, ANATEL held a public consultation about regulatory barriers to IoT expansion and proposed changes in MVNO regulations. Furthermore, in November 2020, ANATEL Resolution No. 735/2020 reduced regulatory restrictions on the “accredited” model, and permitted the representation of multiple MNOs and gave more autonomy in the use of network agreements. In November 2023, ANATEL published a public consultation dedicated to updating the PGMC in which the MVNO, as a wholesale product, is considered a relevant market. As of the end of the public consultation, the updated PGMC was published in September 2025, with ANATEL determining that the MVNO, as a wholesale product, should not be considered a relevant market. Consequently, the parties remain free to negotiate the terms of their MVNOs agreements, while still complying to the current regulations on the subject, including Resolution No. 777/2025. Internet and related services in Brazil In Brazil, internet service providers, or ISPs, are deemed to be suppliers of value-added services and not telecommunications service providers. ANATEL requires SCM operators to act as carriers of third-party internet service providers. 72 Table of Contents Civil rights framework for the Internet On April 23, 2014, the Brazilian Civil Rights Framework for the Internet (Marco Civil da Internet) was enacted through Law No. 12.965/2014. The act adopts strict Net Neutrality rules that guarantee equality of treatment for data traffic in the network and preserves the business model of Brazilian broadband offered in packages with different speeds. On May 11, 2016, the Brazilian government published Decree No. 8,711/2016, which regulates the law. It establishes the regulation for Net Neutrality and mechanisms to protect the data stored by service and application providers, as well as determining the circumstances in which data can be obtained by the public administration. We believe these measures offer our clients greater protection with respect to how their personal information is used and shared and creates opportunities for new services that make use of aggregated information. Brazilian General Data Protection Law (LGPD) Law No. 13.709/2018, or the LGPD, came into force on September 18, 2020. It is a comprehensive data protection law establishing general principles and obligations that apply across all economic sectors and contractual relationships. To regulate and supervise the application of the law, the ANPD was created and has been under the administration of the Ministry of Justice since 2023. Certain aspects of the LGPD will be subject to further regulation by the ANPD, in accordance with ANPD’s Ordinances No. 11/2021, 35/2022, and Resolution No. 23/2024, following its regulatory schedule published every two years. The LGPD establishes detailed rules for the collection, use, processing and storage of personal data in all economic sectors, regardless of whether data is collected in a digital or physical environment. In general, our services and processes depend on personal data. The way in which we collect, store and manage this data must comply with the provisions of the LGPD. In addition, the administrative sanctions provided for in the LGPD (Articles 52, 53, and 54) came into force on August 1, 2021, pursuant to Law No. 14.010/2020, and additional rules were established with the publication of 10 additional regulations so far. Some of the main regulations, include the Administrative Sanctions and Dosimetry Regulation (Resolution No. 4/2023), the Security Incident Communication Regulation (Resolution No. 15/2024), and the International Data Transfer and Standard Contractual Clauses Regulation (Resolution No. 19/2024). As of the date of this annual report, the ANPD has signed a number of technical cooperation agreements with administrative bodies and agencies, including the SENACON, the Brazilian Office of the Controller General (Controladoria Geral da União), or CGU, the National Supplementary Health Agency (Agência Nacional de Saúde Suplementar), the Latin America Development Bank and with the Information Commissioner’s Office of the United Kingdom. The ANPD has also signed a memorandum of understanding with the Spanish Data Protection Authority and with the Office of the Privacy Commissioner of Canada to promote cooperation mechanisms, including the exchange of knowledge, experiences, and practices in the field of privacy and personal data protection. For additional information on our practices regarding the LGPD and our Privacy and Data Protection Governance Program, see “Item 16g. Corporate Governance—Corporate Governance Practices—Data Protection and Privacy Initiatives.” Resolutions published A series of new regulations, published by ANATEL as well as other regulatory bodies in Brazil, became effective in 2025. The most relevant among these regulations were: •ANATEL Resolution No. 785: Approves ANATEL’s planning for auctions of radio frequency authorizations for SMP; •ANATEL Resolution No. 784: Amends the Regulation on Administrative Sanctions (RASA); •ANATEL Resolution No. 783: Approves the General Competition Goals Plan (PGMC); •ANATEL Resolution No. 782: Amends the Regulation on Conduct Adjustment Commitment Agreements (RTAC); 73 Table of Contents •ANATEL Resolution No. 781: Amends the Regulation on Licensing for Concession, Permission, and Authorization of Telecommunications Services and Radio Frequency Use; •ANATEL Resolution No. 780: Amends the Regulation on Conformity Assessment and Product Homologation for Telecommunications; •ANATEL Resolution No. 779: Approves the Telecommunications Glossary; •ANATEL Resolution No. 778: Ensures compliance with Mercosur/GMC Resolution No. 19/24 on IMT frequency coordination; •ANATEL Resolution No. 777: Approves the General Regulation of Telecommunications Services (RGST); •ANATEL Resolution No. 776: Establishes guidelines for regulatory sandbox and experimental practices; •ANATEL Resolution No. 775: Approves the Regulation for Temporary Use of Radio Frequencies; •ANATEL Resolution No. 774: Approves the Regulation for Collection and Transfer of Sectoral Data; •ANATEL Resolution No. 773: Approves the Regulation on Conditions of Use of Radio Frequencies; •ANATEL Resolution No. 772: Approves the National Frequency Allocation, Assignment, and Distribution Plan (PDFF). Public consultations published In 2025, ANATEL announced a series of public consultations. The most relevant among these public consultations were: •ANATEL Public Consultation No. 1: Reassessment of Tables and Appendices (A to D) of Annex I of Resolution No. 396/2005; •ANATEL Public Consultation No. 3: Internalization and consolidation of standards/resolutions from international organizations; •ANATEL Public Consultation No. 9: ANATEL’s planning for auctions of RF authorizations for SMP; ANATEL Public Consultation No. 17: Replacement of the Operational Procedure for Importing Telecommunications Products; •ANATEL Public Consultation No. 19: Methodologies for calculating the base value of fine sanctions; •ANATEL Public Consultation No. 27: Update of requirements for SMP signal booster certification; •ANATEL Public Consultation No. 30: Network sharing and roaming on highways and coverage commitments; •ANATEL Public Consultation No. 31: Use of Artificial Intelligence in the telecommunications service chain; •ANATEL Public Consultation No. 40: Reassessment of the Regulation on Revenue Restitution and Compensation; •ANATEL Public Consultation No. 44: Revocation of regulations (Regulatory Guillotine 2025–2026); •ANATEL Subsidy Taking No. 1: Regulatory Guillotine 2025–2026; •ANATEL Subsidy Taking No. 2: Collection of information on the implementation of new STFC local areas; •ANATEL Subsidy Taking No. 4: Reassessment of regulatory obligations applicable to SeAC; •ANATEL Subsidy Taking No. 5: Reassessment of maximum RF limits; •ANATEL Subsidy Taking No. 6: Improvement of information on SMP service provision; •ANATEL Subsidy Taking No. 8: ARR of the Research Regulation, annex to Resolution No. 654/2015. 74 Table of Contents Other regulatory matters Regulation for competition In December 2016, ANATEL launched a public consultation for a regulation that set price references for wholesale products. The proposal would set the ANATEL cost model as the only source for the valuation of these products. In July 2018, ANATEL approved amendments to the PGMC through Resolution No. 694/2018. The rule creates a new relevant market (high-capacity data transfer) and introduces the concept of retail competitiveness levels for each municipality (ranging from category one, fully competitive, to category four, non-competitive areas where public policies are necessary to enable services). For each relevant market, asymmetric measures may vary according to the competition category assigned to each municipality. In addition, the new PGMC defines small-scale providers (prestadora de pequeno porte), or PPP, which ANATEL factors when creating asymmetric rules (in the context of PGMC and possibly in other regulations). Under the definition set by ANATEL, PPP designation applies to any company that does not account for more than 5% of the retail market share in which it operates. In November 2023, ANATEL published a public consultation dedicated to updating the PGMC which was scheduled to end in April 2024. The updated PGMC was approved and published in September 2025, establishing several obligations for the following wholesale markets. •Passive Infrastructure (Ducts and Subducts); •Interconnection for Fixed Networks; •Interconnection for Mobile Networks; and •Roaming. Updated regulatory framework On October 4, 2019, the New General Telecommunications Law was published. This law revises the General Telecommunications Law and significantly impacts the industry. The New General Telecommunications Law permits fixed-line concessions operators to migrate from a concession regime (in which the underlying assets must be reverted to the government at the end of the concession) to an authorization regime. On December 16, 2024, Telefônica Brasil, ANATEL, the TCU and the Brazilian Ministry of Communications signed the Self-Composition Agreement for the adaptation of our STFC concession contracts to an authorization instrument. The Self-Composition Agreement includes several key conditions that we are required to comply with: (i) Telefônica Brasil is required to make specific investments on terms established under the Self-Composition Agreement; (ii) Telefônica Brasil must maintain the provision of fixed-line telephone services in certain locations without adequate competition, within the concession area until December 31, 2028; (iii) all pending administrative and judicial proceedings related to our concession pending before ANATEL or any courts must be settled, and Telefônica Brasil must withdraw any cases filed against ANATEL; and (iv) Telefônica Brasil must commit to fulfilling public interest pledges for up to 10 years as part of the transition process. On April 11, 2025, Telefônica Brasil signed the unified authorization term with ANATEL that compiled all previous licenses into a single title, thereby finalizing the transaction to the authorization regime. Furthermore, the New General Telecommunications Law also permits the successive renewal of an authorization to explore a spectrum, so long as legal requirements and stipulations are met. Under the previous model, each authorization could be renewed only once. In addition, New General Telecommunications Law permitted the creation of a secondary spectrum trading market among authorized operators, where trades can be placed directly between them. Similarly, companies holding the rights to explore Brazilian satellite positions can have their permits renewed on an unlimited basis. However, these aspects of the law are still subject to implementation through regulations, which have yet to be passed. 75 Table of Contents Finally, under the New General Telecommunications Law, the FUST law was revised to clarify that radio and video broadcasting services are not subject to taxation under the FUST. Telecommunications Self-Regulation System In March 2020, we and the main telecommunications service providers in Brazil launched a joint initiative aimed at establishing the sector’s first comprehensive self-regulation program. The Telecommunications Self-Regulation System (Sistema de Autorregulação das Telecomunicações), or the SART, sets common rules and procedures that must be followed by all participating companies in relation to the most relevant topics regarding the relationship between providers and customers, such as telemarketing, offers, billing and customer care. Although the initiative started with large operators, the SART will be open to any telecommunications company that wants to participate and commits itself to the principles defined by the program. The main benefit for participating companies are the defined procedures and rules towards improving services, resulting in greater consumer satisfaction and promoting an environment that stimulates a more principle-oriented approach to regulatory issues. The first self-regulatory norm established by SART was the Telemarketing Code of Conduct, which brings self-regulation rules for the relationship between consumers and telecommunication operators, setting forth basic principles that must be followed by the companies, such as the duration and number of calls. Additionally, the Do not Disturb Platform was also created, which has already blocked more than 7 million telephones for telemarketing calls at the customer’s request, according to the Telecommunications Providers Association, or CONEXIS. SART also created the Customer Service Regulation, which sets out rules for meeting consumer demands related to telecommunications products and services, in the various relationship channels available. The Billing Regulation, another initiative coordinated by SART, guides collection actions and establishes commitments on payment methods, debt negotiation, contestation, return of amounts and contractual termination. Finally, the Product Offers Regulation, in turn, bring rules on contracting products and services and their presentation, using simple, direct and easy-to-understand language, focusing on bringing more transparency to information disclosure for consumers. Together, these initiatives emphasize the values of respecting consumer rights, promoting fair competition and encouraging correct, efficient and transparent communication with society in general. Telecommunications Consumers Rights The new General Consumer Rights Regulation (RGC) published by ANATEL in November 2023, and approved by Resolution No. 765/2023, introduces changes in certain provisions related to telecommunications service offerings, including rules around blocking due to payment default. This regulation also updates and modernizes customer relationship obligations. The new RGC came into force in September 2025, replacing the previous Resolution No. 632/2014. C.Organizational Structure As of December 31, 2025, 77.13% of our voting shares were controlled by the three main controlling shareholders: Telefónica S.A., with 39.32%, Telefónica Latinoamérica Holding, S.L., with 37.74%, and Telefónica Chile S.A., with 0.06%. 76 Table of Contents Our current general corporate and shareholder structure is as follows: Significant Subsidiaries Our subsidiaries are Terra Networks Brasil Ltda. (formerly known as Terra Networks Brasil S.A.), or Terra, POP Internet Ltda., or POP, and Telefonica Transporte e Logística Ltda, or TGLog, Fundo de Investimento em Direitos Creditórios Vivo Money, or Vivo Money, and Vivo Pay Holding, all of which we own and are based in Brazil. On September 30, 2020, Terra Networks Brasil S.A., a wholly-owned subsidiary of Telefônica Brasil, resolved in favor of changing its corporate form from a corporation to a limited liability company in the process of changing its name to Terra Networks Brasil Ltda. The resolution was carried out through an extraordinary shareholders’ meeting. Associated Companies Aliança Atlântica Holding BV (Aliança): Headquartered in Amsterdam, Netherlands, the entity is 50.00% owned by Telefônica Brasil and holds funds generated by the sale of its shares of Portugal Telecom in June 2010. Companhia AIX de Participações (AIX): Headquartered in Brazil, the entity is 50.00% owned by Telefônica Brasil and holds a 93.00% stake in the Refibra consortium, formed to finalize a network of underground fiber pipelines in Brazil, in order to make them commercially viable. Companhia ACT de Participações (ACT): Headquartered in Brazil, the entity is 50.00% owned by Telefônica Brasil and holds a 2.00% stake in the Refibra consortium. Vivo Ventures Fundo de Investimento em Participações Multiestratégia (Vivo Ventures): Headquartered in Brazil, the fund is 98.00% owned by Telefônica Brasil and 2.00% by Telefônica Open Innovation SL. Telefônica Cloud e Tecnologia do Brasil S/A (T. Cloud): Headquartered in Brazil, the entity is 50.01% owned by Telefônica Brasil and 49.99% by Telefônica Cybersecurity & Cloud Tech, SL. 77 Table of Contents Recicla V Comércio e Reciclagem de Sucatas e Metais Ltda. (Recicla V): Headquartered in Brazil, the entity is directly owned 0.01% by Telefônica Brasil and indirectly held 99.99% by POP. FiBrasil: Headquartered in Brazil, the company is 75.01% controlled by Telefônica Brasil and 24.99% by Telefónica Infra, SLU (“TEF Infra”). GUD Energia: Headquartered in Brazil, the entity is 50.00% owned by Telefônica Brasil and 50.00% by Auren Comercializadora de Energia Ltda. Vivo Pay SCD: Headquartered in Brazil, the entity is directly owned 0.01% by Telefônica Brasil and indirectly held 99.99% by Vivo Pay Holding. Indirect shareholdings Telefônica Brasil S.A. holds indirect interests in the following companies: Telefônica Infraestrutura e Segurança Ltda. (“TIS”), TLF01, Vale Saúde Sempre (VSS), IPNET USA, SAMAUMA and TCyber. Disclosure Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 added Section 13(r) to the Exchange Act. Section 13(r) requires an issuer to disclose in its annual or quarterly reports filed with the SEC whether the issuer or any of its affiliates has knowingly engaged in certain activities, transactions or dealings with the Government of Iran, relating to Iran or with designated natural persons or entities involved in terrorism or the proliferation of weapons of mass destruction during the period covered by the annual or quarterly report. Disclosure is required even when the activities were conducted outside the United States by non-U.S. entities and even when such activities were conducted in compliance with applicable law. The following information is disclosed pursuant to Section 13(r). None of these activities involved U.S. affiliates of Telefónica or the Company. Roaming Agreements with Iranian Operators Some subsidiaries of our controlling shareholder, Telefónica, including us, have entered into roaming agreements with Iranian telecommunication companies. Pursuant to such roaming agreements these subsidiaries’ customers are able to roam in the particular Iranian network (outbound roaming) and customers of such Iranian operators are able to roam in the network of Telefónica’s relevant subsidiary (inbound roaming). For outbound roaming, these subsidiaries pay the relevant Iranian operator roaming fees for use of its network by Telefónica group customers, and for inbound roaming, the Iranian operator pays the relevant subsidiary roaming fees for use of the respective network by its customers. Regarding Iran, we have a roaming agreement with Irancell. During 2025 we recorded US$17.13 in roaming revenues and zero expenses payable to Irancell under this agreement. Telefónica’s subsidiaries and Telefónica’s former subsidiary Telefónica UK Ltd., other than our Company (which arrangements are described above), were party to the following roaming agreements with Iranian telecommunication companies in 2025: (1)Telefónica Móviles España S.A., or TME, Telefónica’s Spanish directly wholly-owned subsidiary, has respective roaming agreements with (i) Mobile Telecommunication Company of Iran, or MTCI, (ii) Taliya Mobile, or Taliya, and (iii)Telecommunication Kish Co., or TKC. During 2025, TME recorded the following revenues related to these roaming agreements: (i) €690,172.66 from MCI, (ii) no revenues from Taliya and (iii) no revenues from TKC. 78 Table of Contents (2)Telefónica Germany GmbH & Co. OHG, or TG, Telefónica’s 96.85% indirectly-owned subsidiary (as of December 31, 2025), has respective roaming agreements with MTCI and Irancell. During 2025, TG recorded the following revenues related to these roaming agreements: (i) €4,614.95 and (ii) €43,133.77 from Irancell. (3)Telefónica UK Ltd, or TUK, Telefónica’s former English directly wholly-owned subsidiary, has a roaming agreement with Taliya. TUK ceased to be Telefónica’s subsidiary upon the establishment of JV VMED O2 UK on June 1, 2021, following which establishment TUK has been owned by VMO2. During 2025, TUK recorded no revenues from Taliya. (4)Pegaso PCS S.A. de C.V., or PCS, Telefónica’s Mexican directly wholly-owned subsidiary, has a roaming agreement with Irancell. During 2025, PCS recorded US$75.71 in roaming revenues from Irancell under this agreement. The net profit recorded by Telefónica’s subsidiaries and TUK pursuant to these agreements and arrangements did not exceed the related revenues recorded thereunder. The purpose of all of these agreements is to provide the Telefónica group’s customers with coverage in areas where the group does not own networks. For this purpose, Telefónica’s subsidiaries intend to continue maintaining those agreements, which are still outstanding. The Telefónica group does not currently have any plans to enter into new roaming arrangements with Iranian telecommunication companies. However, the Telefónica group may consider entering into such arrangements in the future. During 2025, Telefónica Hispam (“TH”) had one retail mobile phone contract with one customer identified in the list administered by OFAC as sanctioned pursuant to Executive Order 13382. During 2025, TH recorded revenues totaling US$24.32 dollars related to this customer. The termination of such contract is being considered. The provision of the relevant services by TH was in compliance with applicable laws. During 2025, TG had one retail mobile phone contracts with one customer in Germany identified in the lists administered by OFAC as sanctioned pursuant to Executive Order 13224 and Executive Order 13382. During 2025, TG recorded revenues totaling €2,116.79 related to this customer. The termination of such contract is being considered. The provision of the relevant services by TG was in compliance with applicable laws. D.Property, Plant and Equipment As of December 31, 2025, we had fixed and mobile operations in 3,340 properties, 2,003 of which we own, of which 101 are administrative buildings. Besides that, we have entered into standard leasing agreements to rent the remaining properties, under which 124 administrative areas, seven kiosks and 307 retail stores are leased. Our main physical properties for providing fixed-line telephone services involve the segments of switching (public switching telephone network, or PSTN), transmission (optic and wireless systems), data communication (multiplex devices, IP network), infrastructure (energy systems and air conditioning) and external network (fiber optic and metallic cables), which are distributed in many buildings throughout the state of São Paulo and in the main cities outside the state of São Paulo. Some of these buildings are also used for administrative and commercial operations. Our main physical property for mobile services consists of transmission equipment, switching equipment, base stations, and other communication devices, such as voicemail, prepaid service, short message service, home location registers, signaling transfer point, packet data switching network and gateways. All switches, cellular sites, administrative buildings, administrative facilities, warehouses and stores are insured against damages for operational risks. 79 Table of Contents Pursuant to Brazilian legal proceedings, liens have been attached to several properties pending the outcome of various legal proceedings to which we are a party. See “Item 8. Financial Information—A. Consolidated Statements and Other Financial Information—Legal Proceedings.” In addition, certain of our properties are still pending the applicable licenses and approvals from the local fire departments. We are constantly making improvements to our facilities and network to meet customer demand and to improve the level of services we offer our clients. Environmental matters Brazilian environmental legislation at federal, state, and municipal levels regulate environmental protection, the responsible use of natural resources, the preservation of fauna and flora, climate change mitigation and adaptation, as well as pollution prevention and control. Under these laws, specific environmental licenses are required for the undertaking the construction, installation, expansion, or operation of structures used to provide telecommunications services. According to the enforceability defined by the competent authorities, this obligation is extended to telecommunications infrastructure such as support structures for radio/cell base stations, transmission backhaul, and backbone networks, as well as to specific regulations related to air emissions, soil and water pollutants, take-back systems, recycling and waste management, interference with areas of cultural and historical relevance, environmental protected areas and contamination. In Brazil, non-compliance with environmental rules or regulations may result in civil, administrative, or criminal liability. Regarding civil liability, Brazilian environmental laws adopt a standard of strict, unlimited, and joint liability remediation of environmental impacts. Furthermore, Brazilian courts may pierce the corporate veil when and if it poses an obstacle to the full recovery of environmental damages. Within the administrative sphere, companies may face penalties of up to R$50 million, suspension of operations, exclusion from specific government contracts, obligations to repair or indemnify environmental damages, loss of tax benefits and incentives and be at a competitive disadvantage to match the criteria assessed by sustainability indexes such as the Dow Jones Best-in-Class World Index and the B3’s Corporate Sustainability Index (ISE B3). We have procedures in place to protect our networks, reputation and operations from environmental impacts, ranging from operational controls to specific insurance coverage for civil and environmental matters. In order to maintain and enhance environmental performance, we have implemented the Solid Waste Management System (Gretel), that allows us to manage the flow of generation, transportation and disposal of hazardous and non-hazardous waste, promoting supply chain traceability and circular economy actions. The Company has an Environmental Management System (EMS) that follows the international standard ISO 14001, with third-party certification covering the major capitals and metropolitan regions since 2016. The EMS is periodically audited on a sample basis to assess its effectiveness. Observations identified during these audits are addressed through action plans aimed to provide continuous improvement and best environmental practices. Engineering measures are also implemented to mitigate potential risks, such as reducing visual impact of facilities, modernizing equipment to lower noise emissions, and adapting structures to contain potential leaks. Energy is a critical resource for our network infrastructures, which requires substantial power. To address this demand, we have implemented a Renewable Energy Plan that enabled us to achieve 100% renewable electricity consumption since November 2018—12 years ahead of our initial target. This milestone was achieved through a combination of distributed generation, self-generation, free-market (FM) energy purchases, and the acquisition of renewable energy certificates with guarantees of origin. In 2025, we reached 77 Distributed Generation plants with 76.4 MWm of installed capacity across Brazil. Upon the completion of the project, it will supply 90% of our low-voltage energy consumption, with a total installed power of 80.9 MWm from renewable sources (solar, hydro, and biogas). 80 Table of Contents Climate change is a key pillar of our sustainability strategy, supported by short-, medium-, and long-term objectives consolidated in our Climate Action Plan approved by the Board of Directors. Our main goal is to achieve net zero emissions by 2035 for the entire value chain. Significant progress has been made, including reducing our greenhouse gas (GHG) emissions (Scope 1 and 2) by 90% compared to our 2015 baseline. This achievement was enabled by renewable energy purchases, resulting in zero Scope 2 emissions under a market-based approach; use of biofuel in our fleet; operational improvements in air conditioning systems; and compensating for residual emissions. Since 2019, we have offset 100% of operational emissions through high-integrity carbon credits, selected to generate positive social and environmental impacts, including preventing deforestation and supporting restoration in Brazilian forests. Beyond operational emissions (Scope 1 and 2), which are linked to 5% of all our employees’ Results Participation Program (PPR, its acronym in Portuguese), we are working to reduce impacts across our value chain. Through the Supply Chain Engagement Carbon Program, we engage our suppliers from the most carbon-intensive categories to measure and manage emissions, seek reduction alternatives, and make a voluntary climate commitment, contributing to our Scope 3 reduction target. Environmental transparency is essential for a net-zero future. In 2025, we launched the third edition of our Climate Action Plan for public consultation and investor feedback, consolidating our strategy for transitioning to a low-carbon economy. We have consistently been among the Brazilian companies recognized in a leadership position by CDP Climate Change, demonstrating the strength of our environmental management. In 2006—prior to Brazil’s National Policy on Solid Waste (Law No. 12,305/2010) and Decree No. 10,240/2020, regulating mandatory reverse logistics of electronic—we launched the Vivo Recicle Program, a pioneering initiative in the sector promoting circular economy and proper disposal of electronic waste nationwide. The program offers approximately 1,800 collection points for receiving used devices such as cell phones, tablets, headphones, chargers, and batteries. Since its implementation, millions of e-waste items have been collected, resulting in the recycling of approximately 232 tons of materials. In 2025, the Vivo Recicle Program increased more than 20%, growing from 37 tons collected and recycled in 2024 to over 45 tons in 2025. We have also set a long-term commitment to collect 375 tons of electronic waste by 2035, reinforce our leadership in circular economy practices.
A.Operating Results The following discussion should be read in conjunction with our consolidated financial statements and accompanying notes and other information appearing elsewhere in this annual report. We prepared our consolidated financial statements included in this annual…
A.Operating Results The following discussion should be read in conjunction with our consolidated financial statements and accompanying notes and other information appearing elsewhere in this annual report. We prepared our consolidated financial statements included in this annual report in accordance with IFRS Accounting Standards. The following discussion contains forward-looking statements that involve risks and uncertainties. Our actual results and the timing of events may differ materially from those expressed or implied in such forward-looking statements as a result of various factors, including those set forth in “Cautionary Statement Regarding Forward-Looking Statements” and “Item 3. Key Information—D. Risk Factors.” 81 Table of Contents Significant Factors Affecting Our Results of Operations We believe that our results of operations and financial performance are driven by the following factors: Brazilian economic environment The Brazilian economic environment has historically been characterized by significant variations in economic growth, inflation and currency exchange rates. As a Brazilian company, our results of operations and financial condition are significantly influenced by these factors and the effect that these factors have on employment rates, the availability of credit and average wages in Brazil. While the Brazilian GDP is expected to have increased in recent years, we cannot assure that this trend will continue in the future. The modest fiscal adjustments that were put in place, combined with higher interest rates and economic slowdown, has maintained uncertainty regarding Brazil’s public debt sustainability. This has contributed to higher volatility in financial asset prices and Brazil’s risk premium, and a limitation in the room for the Brazilian real to strengthen. Regarding economic growth, after some years of GDP growth above 3%, boosted by fiscal and monetary stimuli, historically low unemployment levels and a strong performance in certain economic sectors, in 2025, GDP growth is estimated to have slowed to 2.3% (from 3.4% in 2024), according to market consensus, mainly driven by the monetary policy tightening. The macroeconomic outlook for 2026 is expected to be clouded by high interest rates in the beginning of the year, and uncertainty on both domestic political front due to presidential elections, and on global economic and geopolitical environments. The market consensus anticipates that Brazil’s GDP growth in 2026 will be lower than in 2025. Any slowdown in Brazil’s economic growth, changes in interest rates, unemployment levels, or general price stability could adversely affect our business, financial condition, and results of operations. Brazil registered a trade balance surplus of US$68.3 billion in 2025, down from the result of US$74.2 billion in 2024. Exports increased by 3.5%, reaching US$348.7 billion, while imports increased by 6.7%, totaling US$280.4 billion. Foreign direct investment inflows into Brazil amounted to US$77.7 billion in the 12 months accumulated as of December 31, 2025, compared to US$74.1 billion during the same period in 2024. International reserves as of December 31, 2025 stood at US$ 358.2 billion, reflecting a change from US$329.7 billion as of December 31, 2024. The primary fiscal result posted a deficit of 0.43% of GDP as of December 31, 2025, compared to a deficit of 0.4% of GDP at the end of December 2024, according to the Central Bank of Brazil. Gross public debt rose to 78.7% of GDP as of December 31, 2025 compared to 76.3% at the end of December 2024. These fiscal pressures can indirectly affect businesses through higher borrowing costs, reduced consumer purchasing power, and potential currency volatility, all of which could impact operational costs and demand for services. For companies in capital-intensive industries, such as telecommunications, the fiscal environment remains a key factor influencing strategic planning and results of operations. Inflation and governmental measures to curb inflation In recent years, inflation has oscillated around its target, set annually by the CMN. Inflationary shocks have pushed Brazil’s inflation rate above the target in the past few years. From 2005 to 2018, the target level was 4.5%, with a tolerance interval of 2.0 percentage points until 2016, when the tolerance band was narrowed to 1.5 percentage points. The CMN subsequently lowered the target to 4.25% in 2019, with 0.25 percentage point decreases implemented annually until it reaches 3.00%. In June 2023, the CMN made the 3.00% inflation target permanent for subsequent years. 82 Table of Contents In 2021, inflation increased to 10.1% at the end of the year (from 4.5% in 2020), as a result of several shocks that ranged from problems in global supply chains – which increased prices at the wholesale level – to climate setbacks – which hit energy and foodstuff prices – as well as the depreciation of the Brazilian real. In 2022, inflationary pressures escalated in Brazil, including as a result of the ongoing war between Ukraine and Russia, supply chain issues, the continued COVID-19 pandemic and increases in energy prices. As a result, inflation peaked at 12.1% in April 2022 (as measured by the IPCA in year-over-year terms) the highest levels since 2003 in Brazil. Following the dissipation of these shocks, accumulated inflation in Brazil slowed to 5.8% by the end of 2022 and to 4.6% by the end of 2023. In 2024, inflation increased to 4.8% by the end of the year, as a result of droughts which disrupted food supplies, increases in energy prices, and the depreciation of the real. In 2025, inflation receded to 4.3%, driven by the monetary policy tightening effects and exchange rate appreciation, but remained above the 3.00% target. Before 2006, the fees we charged our customers were periodically adjusted by ANATEL based on the inflation rates measured by the IGP-DI. Starting in 2006, telephone fees were indexed to the IST, which is a basket of Brazilian indexes that reflect the telecommunications sector’s operating costs. Such indexing reduced inconsistencies between revenue and costs in our industry and therefore reduced the adverse effects of inflation on our business. The IST for the year ended December 31, 2025 was 3.5% according to the most recent ANATEL data. The table below shows the Brazilian general price inflation (according to the IGP-DI, IPCA and the IST) for 2021 through 2025: Inflation (%) as Measured by the IGP-DI Inflation (%) as Measured by the IPCA Inflation (%) as Measured by the IST December 31, 2021 17.7 10.1 17.3 December 31, 2022 5.0 5.8 6.9 December 31, 2023 (3.3) 4.6 2.1 December 31, 2024 6.9 4.8 4.6 December 31, 2025 (1.2) 4.3 3.5 Source: FGV, IBGE and ANATEL. In 2021, the Central Bank began a monetary tightening cycle in response to rising inflation, the depreciation of the real, and a perception of recovery in certain economic activities following the easing of COVID-19-related restrictions. The SELIC rate increased from 9.25% as of December 31, 2021, to 13.75% as of December 31, 2022. In 2023, the Central Bank initiated an easing cycle as inflationary pressures subsided, reducing the SELIC rate to 11.75% as of December 31, 2023. The easing continued into the first half of 2024, with the SELIC rate reaching 10.50% in May 2024. However, inflationary pressures resurfaced in mid-2024, driven by adverse climatic conditions affecting food and energy prices and a depreciation of the real, amid robust economic activity and tight labor market. In response, the Central Bank resumed tightening monetary policy, increasing the SELIC rate up to 15.00% in June 2025 and maintaining it at this level until December 2025. These adjustments reflect the Central Bank’s efforts to balance inflation control with economic stability. As of the date of this annual report, the SELIC rate is 15.00%. Periods of higher inflation coupled with higher interest rates and other measures to combat inflation may lead to reduced demand for our products. Inflation is also likely to increase some of our costs and expenses, which we may not be able to fully pass on to customers and could adversely affect our operating margins and operating income. In addition, inflation affects our financial liquidity and financial capital resources primarily by exposing us to variations in our floating-rate loans. Higher interest rates may also impact the costs of our fundraising and indebtedness, increasing our financial expenses. Such an increase could adversely affect our ability to pay our obligations to the extent it reduces cash on hand. On the other hand, we have generally been able to pass through price increases, mostly in line with inflation, to our customer base, partially offsetting the negative effects. 83 Table of Contents Although we are not able at this time to predict the extent to which these events may have a material, or any, effect on our financial or operational results in future periods, we could be negatively impacted if economic conditions decline further and remain volatile. Geopolitical developments The geopolitical conflicts between Russia and Ukraine, and between Israel and Hamas, have led to disruptions in the global markets for various commodities - particularly oil, fuel, certain agricultural products, and fertilizers - including through sanctions, export/import controls and other trade restrictions. In addition, developments in other jurisdictions (including Venezuela) and changes in applicable sanctions regimes may from time to time create further uncertainty and volatility in global energy and commodity markets. While the precise effect of the ongoing war and these geopolitical developments on global economies remains uncertain and ever-changing, they have already resulted in significant volatility in financial markets, as well as an increase in energy and commodity prices globally. While, as of the date of this annual report, there have not been any material impacts from these conflicts on our business, we are continuously monitoring the developments to assess any potential future impacts that may arise as a result of such developments. The adverse effects—global or localized—of these developments, and/or economic sanctions and import and/or export controls to be imposed by the United States, the UK, the EU or others in connection with any such conflicts, and their adverse effects on the wider global economy and market conditions could have a material adverse effect on our business, financial condition and results of operations. Foreign exchange rates The Brazilian currency has, during the last decades, experienced frequent and substantial variations in relation to the U.S. dollar and other foreign currencies. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$4.8413 per US$1.00 on December 31, 2023, which reflected a 7.4% appreciation in the real against the U.S. dollar during the year. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$6.1923 per US$1.00 on December 31, 2024, which reflected a 27.9% depreciation in the real against the U.S. dollar during the year. The real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$5.5024 per US$1.00 on December 31, 2025, which reflected an 11% appreciation in the real against the U.S. dollar during the year, influenced in part by higher Brazilian interest rates relative to the U.S., attracting capital inflows, alongside improving global risk sentiment and solid commodity exports. As of February 23, 2026, the real/U.S. dollar exchange rate reported by the Brazilian Central Bank was R$5.17 per US$1.00. Depreciation of the real relative to the U.S. dollar has created additional inflationary pressures in Brazil, which has led to increases in interest rates and limited Brazilian companies’ access to foreign financial markets. Depreciation of the real may also, in the context of an economic slowdown, lead to decreased consumer spending, deflationary pressures and reduced growth of the Brazilian economy as a whole, and thereby harm our asset base, financial condition and results of operations. Conversely, appreciation of the real relative to the U.S. dollar and other foreign currencies could lead to a deterioration of the Brazilian foreign exchange currency balance of payments, as well as dampen export driven growth. Depending on the circumstances, either depreciation or appreciation of the real could materially and adversely affect the growth of the Brazilian economy and our business, financial condition and results of operations, as volatility of the Brazilian real against the U.S. dollar may in any case affect the purchasing power of Brazilian consumers and cause a negative impact on the ability of our customers to pay for our telecommunications services. 84 Table of Contents Sources of Revenue The breakdown of our operating revenue is presented net of discounts. In addition, we categorize our revenue according to the following groups: •Exploitation of communications and telecommunications services; •Development of activities necessary or useful to the execution of these services, in conformity with the concessions, authorizations and permissions granted thereto; •Exploitation of value-added services, development, availability, distribution, and commercialization of digital services, as well as audio, video, image, text, and internet based applications in any medium, including advertising and promotional materials; •Exploitation of integrated solutions, management and provision of services related to: (i) data center, including hosting and colocation; (ii) storage, processing and management of data, information, texts, images, videos, applications and information systems and similar activities; (iii) information technology; (iv) information and communications security; (v) telecommunications; and (vi) electronic security systems related to theft, intrusion, fire and others; and •Licensing and sub-licensing of any nature. Results of Operations The following table sets forth certain components of our net income for each year ended December 31, 2025, 2024 and 2023, as well as the percentage change of each component. Year ended December 31, Percent change 2025 2024 2023 2025–2024 2024–2023 (in millions of reais) Net operating revenue 59,595.0 55,845.0 52,100.1 6.7 % 7.2 % Cost of sales (32,925.4) (31,352.1) (29,415.4) 5.0 % 6.6 % Gross profit 26,669.6 24,492.9 22,684.7 8.9 % 8.0 % Operating (expenses) income (16,810.4) (15,819.4) (14,766.9) 6.3 % 7.1 % Selling expenses (13,348.1) (12,953.8) (12,439.2) 3.0 % 4.1 % General and administrative expenses (3,771.6) (3,205.0) (2,957.3) 17.7 % 8.4 % Other operating income, net 327.5 343.8 640.3 (4.7 %) (46.3 %) Share of results in investees - equity method (18.2) (4.4) (10.7) 313.6 % (58.9 %) Operating income 9,859.2 8,673.5 7,917.8 13.7 % 9.5 % Financial expenses, net (2,588.3) (1,909.7) (2,343.9) 35.5 % (18.5 %) Income before taxes 7,270.9 6,763.8 5,573.9 7.5 % 21.3 % Income and social contribution taxes (1,093.4) (1,206.5) (533.9) (9.4 %) 126.0 % Net income for the year 6,177.5 5,557.3 5,040.0 11.2 % 10.3 % Net income attributable to: Controlling shareholding 6,167.9 5,547.9 5,029.4 11.2 % 10.3 % Non-controlling shareholders 9.6 9.4 10.6 2.1 % (11.3 %) 85 Table of Contents Results of Operations for the Year Ended December 31, 2025 Compared to the Year Ended December 31, 2024 The table and descriptions below set forth explanations for the variations: Year ended December 31, Percent change % 2025 2024 2025-2024 (in millions of reais) Net operating revenues 59,595.0 55,845.0 6.7 % Services 55,094.7 51,751.4 6.5 % Sale of goods 4,500.3 4,093.6 9.9 % Net operating revenue Net operating revenue increased by R$3,750.0 million, or 6.7%, from R$55,845.0 million in 2024 to R$59,595.0 million in 2025, maintaining the tendency of growing our revenues from services and sale of goods above the inflation rates registered in the period (IPCA of 4.3% in 2025) at rates of 6.5% and 9.9%, respectively, when compared to 2024. Our services revenue, which increased by R$3,343.3 million, or 6.5%, to R$55,094.7 million in 2025 from R$51,751.4 million in 2024, was boosted by the strong performance of the mobile business, mainly in postpaid services, supported by the growth in our customer base, reduction in churn and annual price adjustments. As for revenues from the sale of goods, which increased by R$406.7 million, or 9.9%, to R$4,500.3 million in 2025 from R$4,093.6 million in 2024, such performance was mainly impacted by the increased demand for 5G smartphones and accessories, combined with the broad range of electronics that composes our portfolio. Cost of sales Cost of sales increased by R$1,573.3 million, or 5.0%, from R$31,352.1 million in 2024 to R$32,925.4 million in 2025. The table and descriptions below set forth explanations for these variations: Year ended December 31, Percent change 2025 2024 2025-2024 (in millions of reais) Cost of goods sold (4,555.5) (4,468.0) 2.0 % Depreciation and amortization (12,367.7) (11,713.1) 5.6 % Third-party services and other (11,349.9) (10,391.6) 9.2 % Rental, insurance, condominium and connection means (1,242.3) (1,383.8) (10.2 %) Personnel (1,414.6) (1,366.5) 3.5 % Taxes, charges and contributions (1,995.4) (2,029.1) (1.7 %) Cost of sales (32,925.4) (31,352.1) 5.0 % Cost of Goods Sold: Cost of goods sold increased by R$87.5 million, or 2.0%, from R$4,468.0 million in 2024 to R$4,555.5 million in 2025, mainly due to the growth of handsets and ICT equipment's sales, combined with the broad range of electronics that composes our portfolio, corresponding to an increase in the sale of goods revenue line. Depreciation and Amortization: Costs related to depreciation and amortization increased by R$654.6 million, or 5.6%, from R$11,713.1 million in 2024 to R$12,367.7 million in 2025, resulting from accelerated depreciation of legacy technologies equipments. 86 Table of Contents Third-Party Services and Other: Costs related to outside services and other increased by R$958.3 million, or 9.2%, from R$10,391.6 million in 2024 to R$11,349.9 million in 2025, mainly due to the costs related to third-party services, associated with the expansion of our network, and Corporate Data & ICT revenue. Rental, Insurance, Condominium and Connection Means: Costs related to rent, insurance, condominium and connection means decreased by R$141.5 million, or 10.2%, from R$1,383.8 million in 2024 to R$1,242.3 million in 2025, mainly due to decreases as a result of network rental efficiencies and lower condominium fees. Personnel: Personnel expenses increased by R$48.1 million, or 3.5%, from R$1,366.5 million in 2024 to R$1,414.6 million in 2025, driven by annual wage and benefits readjustments. Taxes, Charges and Contributions: Taxes, charges and contributions decreased by R$33.7 million, or 1.7%, from R$2,029.1 million in 2024 to R$1,995.4 million in 2025, primarily due to lower regulatory fees and other taxes. Operating (expenses) income Operating (expenses) income increased by R$977.2 million, or 6.2%, to R$16,792.2 million in 2025 from R$15,815.0 million in 2024. The table and descriptions below set forth explanations for these variations: Year ended December 31, Percent change 2025 2024 2025–2024 (in millions of reais) Selling expenses (13,348.1) (12,953.8) 3.0 % General and administrative expenses (3,771.6) (3,205.0) 17.7 % Other operating income (expenses), net 327.5 343.8 (4.7 %) Total (16,792.2) (15,815.0) 6.2 % Selling Expenses: Our selling expenses increased by R$394.3 million, or 3.0%, from R$12,953.8 million in 2024 to R$13,348.1 million in 2025, given higher costs with third-party services related to the increased commercial activity as well as personnel-related expenditures resulting from annual wage and benefits readjustments and greater costs with variable compensation. General and Administrative Expenses: Our general and administrative expenses increased by R$566.6 million, or 17.7%, from R$3,205.0 million in 2024 to R$3,771.6 million in 2025, mainly due to higher expenses with systems development, licenses and software, and consultancy firms. Other Operating Income (Expenses), Net: Other operating income, net decreased by R$16.3 million, or 4.7%, from R$343.8 million in 2024 to R$327.5 million in 2025, due to the effect of higher expenses related to contingencies and asset disposal services, was offset by higher tax recoveries, investment gains, sales of scrap metal and extinguished fibers, and gains from real estate sales. Financial income (expenses), net: In 2025, our financial expense, net amounted to R$2,588.3 million, an increase of R$678.6 million, or 35.5%, from an expense of R$1,909.7 million in 2024, mainly due to the reversal of monetary updates on provisions related to the migration of fixed-line voice concession to an authorization regime in 2025 combined with net gains related to adherence to tax amnesty programs, partially offset by higher level of revenue from interest income. 87 Table of Contents Income and social contribution taxes: Income and social contribution tax expenses decrease R$113.1 million, or 9.4%, from R$1,206.5 million in 2024 to R$1,093.4 million in 2025. This was primarily due to benefits from the Good Law. As a result, in 2025, our effective rate of income and social contribution taxes amounted to 15.0%, a decrease of 2.8 p.p. as compared to 17.8% in 2024. Results of Operations for the Year Ended December 31, 2024 Compared to the Year Ended December 31, 2023 For a discussion of our results of operations for the year ended December 31, 2024 compared to the year ended December 31, 2023, please see “Item 5. Operating and Financial Review and Prospects—A. Operating Results—Results of Operations for the Year Ended December 31, 2024 Compared to the Year Ended December 31, 2023” of our annual report on Form 20-F for the year ended December 31, 2024. B.Liquidity and Capital Resources General We fund our operations and capital expenditures primarily from operating cash flows, loans obtained from financial institutions or development banks, and debentures. As of December 31, 2025, we had R$7.0 billion in cash and cash equivalents. We do not have any material unused sources of liquidity. Our principal cash requirements include: •the servicing of our indebtedness; •capital expenditures; and •the payment of dividends. Our management believes that our sources of liquidity and capital resources, including working capital, are adequate for our present requirements. Sources of Funds Our net cash generated by operating activities was R$20.7 billion in 2025, an increase of R$841 million, or 4.2%, compared to R$19.9 billion in 2024. The increase in cash flow from operations is primarily due to a rises of taxes to recover, which are mainly a result of certain tax credits and taxes, charges and contributions, partially offset by interest paid on loans, financing, debentures and leases. For a discussion of our sources of funds for the year ended December 31, 2024 compared to the year ended December 31, 2023, please see “Item 5. Operating and Financial Review and Prospects—B. Liquidity and Capital Resources—Sources of Funds” of our annual report on Form 20-F for the year ended December 31, 2024. Uses of Funds Our net cash used in investing activities was R$10.0 billion in 2025, an increase of R$1.1 billion, or 12.4%, compared to R$8.9 billion in 2024. This increase was primarily driven by higher investments as a result of M&A activities in connection with the acquisition of Samauma, FiBrasil and CyberCo. Our net cash used in financing activities recorded an outflow of R$10.4 billion in 2025, an increase of R$1.7 billion, or 20.0%, compared to R$8.6 billion in 2024. This increase was mainly due to higher debt repayments, as well as share buybacks and capital reductions. 88 Table of Contents For a discussion of our uses of funds for the year ended December 31, 2024 compared to the year ended December 31, 2023, please see “Item 5. Operating and Financial Review and Prospects—B. Liquidity and Capital Resources—Uses of Funds” of our annual report on Form 20-F for the year ended December 31, 2023. Indebtedness As of December 31, 2025, our total debt was as follows: Debt Currency Annual interest rate payable Maturity Total amount outstanding (in millions of reais) Finance Leases (1) BRL — 2056 15,432.9 Debentures Telefônica Brasil 7th issue - Second Series BRL CDI rate + 1,35% a.a. 2027 2,150.4 Debentures FIBrasil 3rd issue - First Series BRL IPCA + 7,3609% a.a. 2034 916.5 5G License BRL SELIC rate 2040 1,034.0 Acquisition - M&A VSS BRL SELIC rate 2029 4.1 Acquisition - M&A VITA IT BRL IPCA 2027 40.5 Acquisition - M&A IPNET BRL SELIC rate/IPCA 2029 170.6 Acquisition - M&A I2GO BRL CDI rate 2031 44.6 Acquisition - M&A Cyber BRL - 2027 16.5 Tax amnesty programs (2) BRL SELIC rate 2029 405.3 Financial institutions BRL CDI rate + 2.92% p.a. 2026 3.7 Other creditors (3) BRL CDI rate + 3.75% p.a. 2028 78.3 Intercompany loan (4) EUR Six-month EURIBOR + 2.4% p.a. 2027 49.3 Total debt 20,346.7 Current 5,348.9 Noncurrent 14,997.8 (1)Our finance leases are related to towers and rooftops, IT equipment leases, infrastructure rent and other means of transmission. (2)Refers to (i) the State of São Paulo Amnesty Program (Law No. 17,843/2023), which allows for the settlement of ICMS debts with reductions in interest and principal for eligible taxpayers, (ii) the State of Paraná Amnesty Program (Law No. 20,946/2021), which provides similar debt settlement benefits, including reductions in fines and interest, (iii) the State of Rio Grande do Sul Amnesty Program (Decree No. 58,067/2025), which allows for the settlement and installment of ICMS debts with reductions in fines and interest, and (iv) the State of Minas Gerais ICMS installment and refinancing programs, related to energy‑related ICMS debts. For more information, please see note 20.c.1 to our audited consolidated financial statements included elsewhere in this annual report.. (3)Refers to the investments made by Polígono in Vivo Money in 2023. See “Item 4. Information on the Company—A. History and Development of the Company—Historical Background—Launch of Vivo Money Credit Rights Investment Funds (FIDCs).” (4)On September 26, 2024, the Company's subsidiary, CloudCo Brasil, entered into a loan agreement with TCCT, a Telefónica Group company, for an amount of €7.4 million (equivalent to R$45.0 million). This loan provides CloudCo Brasil with the financial capacity to fulfill its obligations related to the acquisition of IPNET. The principal amount will be adjusted daily until full repayment, based on the six-month Euro Interbank Offered rate, or the EURIBOR rate, plus 240 basis points per year, from the date the funds are made available until the date of repayment. Interest payments will be made semi-annually, beginning on March 27, 2025, while the principal will be repaid on September 27, 2027. To mitigate risk exposure, a swap contract was executed to hedge against exchange rate fluctuations and convert the fixed interest into CDI rate + 1.795% per year. As of December 31, 2025, the outstanding loan balance was R$49.3 million. Interest and principal payments on our indebtedness as of December 31, 2025 due in 2026 totaled R$5,348.8 million, in comparison to R$6,447.9 million as of December 31, 2024. As of December 31, 2025, our debentures have a sustainability component (Debentures linked to Environmental, Social and Corporate Governance - ESG) performance, classifying them as “sustainability-linked”, under the terms of the International Capital Market Association in the Sustainability-Linked Bond Principles, June 2020 release. 89 Table of Contents These agreements contain certain standard restrictive clauses. These agreements can provide an acceleration of the full balance of our obligations in the event of default. In general, such agreements are subject to the acceleration of maturity over: (i) the inclusion in the agreement of our shareholders, bylaws or articles of incorporation or of the companies that control us of conditions that lead to restrictions or loss of ability to pay financial obligations arising from these agreements; or (ii) liquidation, dissolution, insolvency; bankruptcy, judicial or extrajudicial recovery to any creditor or class of creditors. As of December 31, 2025, we were not in default of any of our obligations and therefore none of our liabilities were subject to acceleration. Foreign exchange and interest rate exposure We face foreign exchange risk due to our foreign currency-denominated accounts payable (including our capital expenditures, particularly equipment) and receivables in foreign currency. A devaluation of the real may increase our cost of debt and certain commitments in a foreign currency. Our revenue is earned in reais, and we have no material foreign currency-denominated assets, except income from hedging transactions, interconnection of international long-distance services and services rendered to customers outside Brazil. Equity investments in foreign companies also suffer effects with variations in the exchange rate. We use derivative instruments to limit our exposure to exchange rate risk. Since September 1999, we have hedged all of our foreign currency-denominated bank debt using swaps and other derivative instruments. Since May 2010, the Company began using net balance coverage, which is the hedging of net positions in foreign exchange exposures, or assets (issued invoices) minus liabilities (received invoices) for foreign exchange exposures, substantially reducing our risk to fluctuations in exchange rates. We could continue to face exchange rate exposure with respect to our planned capital expenditures, however, as a small part of our planned capital expenditures are denominated or indexed in foreign currencies (mostly U.S. dollars). We systematically monitor the amounts and time of exposure to exchange rate fluctuations and may hedge positions when deemed appropriate. The largest part of our reais-denominated debt originally pays interest as a percentage of the CDI rate or has been swapped to do so. The CDI rate is indexed to the average rate of operations transacted among the banks within Brazil. With the CDI rate being a floating rate, we remain exposed to market risk. This exposure to the CDI rate is also present in long derivatives positions and financial investments, which are indexed to percentages of the CDI rate. For more information, see “Item 11. Quantitative and Qualitative Disclosures about Market Risk.” 90 Table of Contents Tabular Disclosures of Contractual Obligations and Commercial Commitments Our contractual obligations and commercial commitments as of December 31, 2025 were as follows: Total Less than 1 year 1–3 years 4–5 years More than 5 years (in millions of reais) Contractual obligations: Loans, financing and leases (1) 15,436.5 4,885.4 6,112.9 3,089.5 1,348.8 Debentures 3,067.0 161.5 2,000.0 181.1 724.4 Derivatives 198.7 52.7 34.6 — 111.3 5G License and cash obligations 1,034.0 68.9 137.9 137.9 689.3 Other Creditors 78.3 31.8 46.5 — — Acquisition - M&A VSS 4.1 — 1.6 2.5 — Acquisition - M&A VITA IT 40.5 22.9 17.5 — — Acquisition - M&A IPNET 170.6 13.7 59.2 97.7 — Acquisition - M&A I2GO 44.6 5.6 11.2 27.9 — Acquisition - M&A Cyber 16.5 — 16.5 — — Amnesty Program 405.3 158.3 204.6 42.4 — Intercompany Loan 49.3 0.7 48.6 — — Pension and other post-retirement benefits 786.5 27.3 14.5 15.5 729.2 Total contractual obligations 21,331.8 5,428.9 8,705.6 3,594.3 3,603.0 Trade accounts payable 9,861.3 9,861.3 — — — Total trade payables 9,861.3 9,861.3 — — — (1)Includes the present value of minimum lease payments on operating leases of rental of equipment, facilities and stores, administrative buildings, and cell sites. See note 21 of our audited consolidated financial statements included elsewhere in this annual report. (2)For more information, see “—Indebtedness” above. Long-Term Debt – Loans, financing, leases and debentures Our long-term debt as of December 31, 2025 was as follows: Amount (in millions of reais) Year ending December 31 2027 5,431.9 2028 2,681.0 2029 1,977.8 2030 1,292.8 2031 onwards 2,073.2 Total 13,456.7 91 Table of Contents Our contractual commitments as of December 31, 2025 were as follows: Amount (in millions of reais) 2026 938.4 2027 838.7 2028 860.6 2029 840.3 2030 360.8 2031 onwards 1,574.5 Total(1)(2) 5,413.3 (1)Includes R$ 1,181.8 million, referring to contracts for the provision of security services with Telefónica Cybersecurity Tech, S.L.U. (“CyberCo”) and its subsidiaries, companies of the Telefônica Group. (2)Unrecognized contractual commitments arising from the purchase of goods and services. The amount presented above represents the total consolidated nominal values equivalent to the full contract period. See note 34(a) to our audited consolidated financial statements included elsewhere in this annual report. Our guarantees as of December 31, 2025 were as follows: Amount (in millions of reais) Insurance of guarantee(1) 30,925.7 Letters of guarantee 9,884.0 Judicial deposits and garnishments 2,964.3 Property and equipment 9.7 Financial investments in guarantee of lawsuits 41.3 Total(2) 43,825.0 (1) These refer to insurance amounts contracted to ensure the continuity of legal proceedings. For more information, see note 20 to our audited consolidated financial statements included elsewhere in this annual report. (2) Guarantees for several commitments with ANATEL, suppliers and legal proceedings. For more information, see notes 4, 10, 13.f and 34(b) to our audited consolidated financial statements included elsewhere in this annual report. For more information, see notes 21 and 34 to our audited consolidated financial statements included elsewhere in this annual report. Capital Expenditures and Payment of Dividends Our principal capital requirements are for capital expenditures and payments of dividends to shareholders. Capital expenditures consisted of additions to property, plant and equipment, additions to intangible assets, including licenses and excluding leases (IFRS 16) which totaled R$9.3 billion, R$9.2 billion and R$9.0 billion for the years ended December 31, 2025, 2024 and 2023, respectively. These expenditures relate primarily to the expansion of our network. We may seek financing for part of our capital expenditures and cash management assistance from the Brazilian government, in particular from BNDES, which is the main government financing agent in Brazil, as well as from the local or foreign capital markets or from local and foreign financial institutions. See “Item 4. Information on the Company—A. History and Development of the Company—Capital Expenditures.” Pursuant to our bylaws and Brazilian Corporate Law, we are required to distribute a mandatory minimum dividend of 25% of our “adjusted net income” (as defined below) in respect of each fiscal year to the extent earnings are available for distribution. 92 Table of Contents Adjusted net income, as determined by Brazilian Corporate Law, is an amount equal to our net income adjusted to reflect allocations to or from (i) legal reserve, (ii) bylaw reserve and (iii) a contingency reserve for anticipated losses, if any. We may also make additional distributions in the case that we have profits and reserves available to distribute. All of the above distributions may be made as dividends or as tax-deductible interest on shareholders’ equity. Interest on shareholders’ equity is tax-deductible payments pursuant to Brazilian Corporate law, that a company may make, in addition to dividends, which the company may treat as financial expenses for tax and social contribution purposes. For more information on the payment of interests on shareholders’ equity, see “Item 8. Financial Information—A. Consolidated Statements and Other Financial Information—Dividends and Dividend Distribution Policy—Dividends and Interest on Shareholders’ Equity.” We deliberated in favor of the distribution of dividends and interest on shareholders’ equity of R$3.4 billion, R$3.1 billion and R$3.4 billion in 2025, 2024 and 2023, respectively. Our management expects to meet 2026 capital requirements primarily from cash provided from our operations. Net cash generated by operating activities was R$20.7 billion, R$19.9 billion and R$18.8 billion in 2025, 2024 and 2023, respectively. Adjustments to net income for purposes of calculating the basis for dividends include allocations to various reserves that effectively reduce the amount available for the payment of dividends. The proposal to pay dividends will be approved at the shareholders’ meeting that will approve the 2025 annual report. See “Item 3. Key Information—D. Risk Factors—Risks Relating to the Common Shares and the ADSs— Holders of our ADSs are not entitled to attend shareholders’ meetings and may only vote through the depositary.” and “Item 10. Additional Information—B. Memorandum and Articles of Association—Description of Our Bylaws—Voting Rights.” Accounting Pronouncements The accounting policies adopted in the preparation of the consolidated financial statements for the year ended December 31, 2025 are consistent with those used in the preparation of the consolidated annual financial statements for the year ended December 31, 2024. New IFRS pronouncements, issues, amendments and interpretations of the IASB The new and amended standards and interpretations issued, but not yet effective up to the date of issue of the Company’s financial statements, are described below. The Company intends to adopt these new and amended standards and interpretations, if applicable, when they become effective. The Company does not anticipate the early adoption for the year ended December 31, 2025 of any pronouncement, interpretation or amendment that has been issued before application is mandatory. •Amendments to the Classification and Measurement of Financial Instruments – Amendments to IFRS 9 and IFRS 7: On May 30, 2024, the IASB issued targeted amendments to IFRS 9 and IFRS 7 to respond to recent questions arising in practice, and to include new requirements not only for financial institutions but also for corporate entities. These amendments: (i) clarify the date of recognition and derecognition of some financial assets and liabilities, with a new exception for some financial liabilities settled through an electronic cash transfer system; (ii) clarify and add further guidance for assessing whether a financial asset meets the solely payments of principal and interest (SPPI) criterion; (iii) add new disclosures for certain instruments with contractual terms that can change cash flows (such as some financial instruments with features linked to the achievement of environment, social and governance targets); and (iv) update the disclosures for equity instruments designated at fair value through other comprehensive income. Effective for annual periods beginning on or after January 1, 2026. 93 Table of Contents •IFRS 18: Presentation and Disclosure in Financial Statements: In April 2024, the IASB issued IFRS 18, which replaces IAS 1. IFRS 18 introduces new requirements for presentation within the income statement, including specified totals and subtotals. In addition, entities are required to classify all income and expenses within the income statement into one of five categories: operating, investing, financing, income taxes and discontinued operations, of which the first three are new. The standard also requires disclosure of management-defined performance measures, subtotals of income and expenses, and includes new requirements for the aggregation and disaggregation of financial information based on the identified “functions” of the primary financial statements (PFS) and the notes. In addition, narrow-scope changes have been made to IAS 7 (equivalent to IFRS 18: Presentation and Disclosure in Financial Statements), which include changing the starting point for determining cash flows from operations using the indirect method, from “profit or loss for the period” to “operating profit or loss” and removing the optionality for classifying cash flows from dividends and interest. IFRS 18 and the amendments to the other standards will come into effect for reporting periods beginning on or after January 1, 2027, with early application permitted and required to be disclosed, although in Brazil early adoption is not permitted. IFRS 18 will be applied retrospectively. •IFRS 19: Subsidiaries without Public Accountability: Disclosures: In May 2024, the IASB issued IFRS 19, which allows eligible entities to elect to apply its reduced disclosure requirements while still applying the recognition, measurement and presentation requirements in other IFRS accounting standards. To be eligible, at the end of the reporting period, an entity must be a subsidiary as defined in IFRS 10, must not have a public accountability and must have a parent (ultimate or intermediate) that prepares consolidated financial statements, available for public use, that comply with IFRS accounting standards. IFRS 19 will be effective for reporting periods beginning on or after 1 January 2027, with early application permitted and required to be disclosed, although in Brazil early adoption is not permitted. The Company is currently working to identify all impacts that the new and amended standards will have on the primary financial statements. The Company did not early adopt any new accounting statements or interpretations, the application of which is not mandatory. C.Research and Development, Patents and Licenses Research and Development We operate in a fast-paced, dynamic and convergent industry, which demands that our products and services be continuously revamped to keep up with growth expectations. The evolution of products and services now includes features to offer new services such as health care, fintech and connected home. The table below presents our investments in the research and development, including investments in the updating and modernization of systems to support the launch of new products and services, for each of the periods indicated: For the Year Ended December 31, 2025 2024 2023 (in millions of reais) Development and Innovation (business incubator and tests) 32.4 25.8 57.9 94 Table of Contents Patents and Licenses Our principal intellectual property assets include: •permission to use the trademark name “Telefônica” and all names derived from “Telefônica”; •our commercial brands in Brazil, “Vivo”, and sub-brands such as “Vivo Fibra”, “Vivo Total”, “Vivo Pós”, “Vivo 5G“, “Vivo Controle”, “Vivo Pré”, “Vivo PlayTV”, “Vivo Easy Lite”, “Vivo Pay”, “Vivo Empresas”, “Vivo Agro”, “Vivo Ventures”, “Vivo Casa Inteligente” and “Velvet”; •the figurative trademark “Vivinho”; •the trademark “Aura”, which is Vivo’s Artificial Intelligence; •permission to use the trademark “Terra”, which provides media and digital services; •“Atma”, Vivo’s brand for a meditation app; •“OVVI”, Vivo’s brand for accessories; •“i2Go”, a brand of accessories of the recent acquired company Samauma Brands Comércio, Importação e Exportação de Eletro‑Eletrônicos Ltda., •“Vale Saúde Sempre”, Telefônica’s brand, which, through a monthly subscription, offers various health services to consumers in a cheap and accessible way; •“VivaE”, a brand of the joint venture between Telefônica/Vivo and the Educational Group Ânima that offers professional courses; and •“Gud Energia”, a brand of the joint venture between Telefônica/Vivo and Auren Energia for energy commercialization for the B2B market. •“IPnet by Vivo”, Vivo’s brand specializing in digital transformation through cloud solutions and services. In September 2016 and December 2024, the Brazilian Trademark Office recognized the “Vivo” trademark and the “Vivinho” figurative trademark, respectively, as “high reputation” trademarks and therefore protected in all branches of activities within Brazilian territory. In 2025, Telefônica’s commercial brand, Vivo, ranked third among the most valuable brands in Brazil, according to the TM20 ranking in partnership with Infomoney, accumulating a brand value of R$50.1 billion. D.Trend Information Reliable and ever-expanding high-speed connectivity will continue to gain relevance as consumers’ digital habits evolve and organizations progress in their digitalization journeys. Beyond technical excellence, customer experience will remain a major differentiator, with increasing adoption of artificial intelligence across customer services and operational service and operational processes. We also expect consumers and enterprise customers to become more selective in their choices, increasing the importance of trust, digital security and ESG-conscious agendas. The demand for ultra-broadband connectivity will continue to increase, notably driven by fiber in small cities. On the other hand, a more mature fiber market with higher penetration and fewer underserved areas will increase market competitiveness, likely accelerating consolidation in the medium term. Furthermore, the high cost of capital should continue to slow the growth pace of regional ISPs, especially those supported by private equity funds, leading these players to seek different strategic approaches to sustain growth. 95 Table of Contents Brazil’s main operators have launched 5G in more than 2,000 cities, with 5G coverage already reaching approximately two thirds of Brazil’s population. 5G adoption should continue to grow as device availability and affordability improve. 5G also marks the entry of new regional players into the mobile market in Brazil, which began launching their operations in early 2024. Vivo will continue expanding its 5G coverage, delivering the best speed and quality mix across the country. The company will also accelerate the rollout of its 5.5G network to more cities and regions, after being the first operator in Brazil to offer this technology to customers, reinforcing its leadership in next-generation connectivity. This will lay the groundwork for future legacy network switch-offs, always focusing on enhancing Vivo’s unmatched user experience. As consumers become more sophisticated in their digital habits, services beyond connectivity will gain relevance. Companies will leverage digitalization to broaden their service portfolios and offer more solutions, focusing on strengthening customer relationships and ultimately increasing revenue per user. Vivo will continue investing in digital services and innovative value propositions as a growth strategy, developing its digital platforms in education, healthcare, financial services, consumer electronics, energy and smart homes. Additionally, Vivo will leverage new partnerships and open innovation initiatives through Wayra and Vivo Ventures, strengthening its path to creating the leading B2C digital ecosystem in Brazil. In the B2B segment, digitization efforts will remain a top priority for CEOs, driving demand for better connectivity services and creating more opportunities for Professional & Managed Services in Cloud, Cybersecurity, IoT, Big Data and Messaging. Operators now have the technical capabilities to monetize their networks as open platforms. In line with this trend, Vivo has partnered with Brazilian operators to launch the Open Gateway initiative, transforming networks into developer-ready platforms, simplifying the development of cross-operator solutions, and supporting the rollout of a new generation of digital services. Customer experience will continue to play a fundamental role in differentiating operators, with generative AI opening a new competitive dynamics. Vivo is committed to providing its customers with the best experiences in the market by leveraging the potential of generative AI to create more engaging and seamless experiences in the Vivo App, while also supporting both call center and in-store agents with AI-enabled tools. On the ESG front, companies are expected to adopt more conscious agendas to foster trust among critical stakeholders, such as customers and investors. Vivo will remain positioned as an intersectoral reference in Brazil, operating in line with the United Nations’ Sustainable Development Goals and advancing towards becoming a Net Zero company by 2035, five years earlier than initially planned. To foster innovation and sustainable business growth, we will continue our journey of talent attraction and retention in an inclusive and diverse environment, always supported by a contemporary brand connected to key social themes. In this context, we believe we are well positioned to strengthen our leadership. Our strategic pillars, guided by Telefonica Group’s key drivers—Deliver best-in-class customer experience, Expand B2C offering, Scale B2B, Evolve technological capabilities, Simplify Telefónica’s Operating Model and Develop Talent—will enable us to achieve our purpose of advancing digitalization to bring people together (“Digitalizar para Aproximar”). E.Critical Accounting Estimates The preparation of the financial statements requires the use of certain critical accounting estimates and the exercise of judgment by the Company’s management in applying the Company’s accounting policies. These estimates are based on experience, better knowledge, information available at the end of the fiscal year, and other factors, including expectations of future events that are believed to be reasonable in the circumstances. Settlement of transactions involving these estimates may result in values that are different from those recorded in the financial statements due to the criteria inherent in the estimation process. The Company reviews its estimates at least annually. 96 Table of Contents The significant and relevant estimates and judgments applied by the Company in the preparation of the financial statements are presented in the following notes to our audited consolidated financial statements included elsewhere in this annual report: corporate events in 2025 (Business Combinations), trade accounts receivable; deferred income and social contribution taxes; property and equipment; intangible assets; impairment of non-financial assets; provision and contingencies; loans and financing, debentures, leases and other creditors; pension plans and other post-employment benefits; and financial instruments and risk and capital management.