GB00B5BT0K07

• Nadin Virani, 49, was appointed interim CFO effective August 17, 2026; he previously served as Global Head of Corporate Planning and Analytics since January 2025.
• Virani's annual base salary will increase by $50,000 per month during his interim CFO term, and he is eligible for an additional cash bonus equal to the total additional base salary earned.
• The transition is governed by a Letter Agreement dated August 17, 2026, between Edmund Reese and Aon Corporation, filed as Exhibit 10.1.
• Virani joined Aon from Broadridge Financial Solutions, where he was Head of Corporate Planning and Analytics, and previously held finance roles at American Express.

5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · 9.01 Financial Statements and Exhibits

• Total revenue increased 2% to $4,246 million in Q2 2026, with organic revenue growth of 5%.
• Adjusted EPS increased 9% to $3.81 in Q2 2026.
• Returned $775 million to shareholders in Q2 2026 through $600 million of share repurchases and $175 million of dividends.
• Reaffirmed 2026 guidance: mid-single-digit or greater organic revenue growth, 70-80 bps adjusted operating margin expansion, strong adjusted EPS growth, and double-digit free cash flow growth.

2.02 Results of Operations and Financial Condition · 9.01 Financial Statements and Exhibits

• On June 26, 2026, Aon Corporation and Gregory C. Case amended his international assignment letter, extending its term to June 30, 2027.
• The amendment extends the letter that was set to expire on June 30, 2026.
• Shareholders did not approve the advisory resolution on executive compensation.
• The Board approved an additional $7.5 billion share repurchase authorization.

5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · 5.07 Submission of Matters to a Vote of Security Holders · 8.01 Other Events · 9.01 Financial Statements and Exhibits

• Total revenue increased 6% to $5.0 billion for the quarter ended March 31, 2026, with organic revenue growth of 5%.
• Operating margin was 34.1% (up 320 bps) and adjusted operating margin was 39.1% (up 70 bps).
• Free cash flow increased 332% to $363 million for the first three months of 2026.
• The company reaffirmed 2026 guidance of mid-single-digit or greater organic revenue growth, 70-80 bps adjusted operating margin expansion, strong adjusted EPS growth, and double-digit free cash flow growth.

2.02 Results of Operations and Financial Condition · 9.01 Financial Statements and Exhibits

• Fourth-quarter total revenue increased 4% to $4.3 billion, with 5% organic revenue growth.
• Full-year 2025 total revenue increased 9% to $17.2 billion, with 6% organic revenue growth.
• Full-year 2025 diluted EPS was $17.02, up 36%; adjusted diluted EPS was $17.07, up 9%.
• For 2026, Aon expects mid-single-digit or greater organic revenue growth, 70-80 basis points of adjusted operating margin expansion, strong adjusted EPS growth, and double-digit free cash flow growth.

2.02 Results of Operations and Financial Condition · 9.01 Financial Statements and Exhibits

• On January 6, 2026, Aon Corporation entered into a separation agreement with Eric Andersen, who will depart the company effective January 31, 2026.
• His LPP 19 PSUs, 3x3PP PSUs, and Special PSUs will be forfeited without consideration.
• His LPP 18 PSUs and 2023 ISP RSUs will vest in Q1 2026, and his 2025 ISP RSUs will vest no later than February 13, 2026.
• The separation benefits are contingent on Andersen's timely agreement to a general release of claims and compliance with the agreement.

5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · 9.01 Financial Statements and Exhibits

• On December 31, 2025, Aon plc and Aon Corporation entered into an amended and restated employment agreement with Gregory C. Case, President and CEO, extending his term to December 31, 2030.
• He will receive a performance share unit grant with a target value of $50 million under the 2011 Incentive Plan, with payouts ranging from 0% to 200% based on five-year performance goals (2026-2030).
• The agreement includes two-year non-competition and non-solicitation provisions, plus customary confidentiality and IP clauses.
• Mr. Case will be nominated for re-election to the board at the 2026 annual general meeting and subsequent meetings during the term.

5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · 9.01 Financial Statements and Exhibits

• Operating income rose 31% to $816 million; adjusted operating income rose 15% to $1,051 million.
• Diluted EPS increased 34% to $2.11; adjusted EPS increased 12% to $3.05.
• Operating margin expanded to 20.4% from 16.7%; adjusted operating margin expanded to 26.3% from 24.6%.
• Company reaffirmed full-year 2025 financial guidance, citing year-to-date performance.

2.02 Results of Operations and Financial Condition · 9.01 Financial Statements and Exhibits