WLK

• Net income attributable to Westlake was $260 million ($2.01 per diluted share), versus a net loss of $169 million in Q1 2026 and $142 million in Q2 2025.
• EBITDA was $679 million in Q2 2026, up from $150 million in Q1 2026 and $210 million in Q2 2025.
• The company reduced debt by $500 million and returned $99 million to shareholders via dividends and share repurchases in Q2 2026.
• The three-pillar profitability improvement plan is on track to deliver a $600 million operating income benefit.

2.02 Results of Operations and Financial Condition · 7.01 Regulation FD Disclosure · 9.01 Financial Statements and Exhibits

• The dismissed cases include Shell Chemical Europe B.V.'s March 2023 lawsuit alleging damages of approximately €1,025 million plus statutory interest.
• The court also dismissed the November 2023 lawsuit by Stichting Ethylene Claims seeking a declaratory judgment of liability for unspecified damages.
• Both dismissals are subject to appeal by the plaintiffs; twelve lawsuits in the Ethylene Antitrust Litigation remain pending at first instance courts.
• The litigation involves Westlake and other ethylene consumers as defendants in civil lawsuits filed in the Netherlands and Germany.

8.01 Other Events

• The Wilhelmshaven plant, previously in insolvency administration, has capacity to produce 380,000 metric tons of PVC per year.
• The acquisition expands Westlake's global chlorovinyls manufacturing footprint and complements its existing chlorovinyl production facilities in Europe and North America.
• The plant is located in Lower Saxony on Germany's North Sea coast, with a deep-water dock for efficient raw-materials supply.
• The disclosure was made under Item 7.01 Regulation FD, with the press release furnished as Exhibit 99.1.

7.01 Regulation FD Disclosure · 9.01 Financial Statements and Exhibits

• The advisory vote to approve named executive officer compensation passed with 121,890,636 votes for, 1,497,095 against, and 88,139 abstentions.
• Shareholders ratified the appointment of PricewaterhouseCoopers LLP as independent auditor for fiscal year ending December 31, 2026, with 124,742,536 votes for, 643,992 against, and 11,324 abstentions.
• All director nominees received majority support, with votes for ranging from 116,153,586 (Sheets) to 122,162,962 (Lubel); broker non-votes were 1,921,982 for each director election.
• The report was filed under Item 5.07 to disclose the results of the shareholder votes at the annual meeting.

5.07 Submission of Matters to a Vote of Security Holders

• Net loss attributable to Westlake was $169 million, or $1.31 per diluted share, compared to a $40 million loss in Q1 2025.
• EBITDA was $150 million in Q1 2026, down from $288 million in Q1 2025; excluding identified items, EBITDA was $235 million.
• Identified items included a $67 million litigation settlement and $18 million in facility shutdown charges.
• Management expects PEM margins to benefit from higher global feedstock and energy prices through at least summer 2026.

2.02 Results of Operations and Financial Condition · 7.01 Regulation FD Disclosure · 9.01 Financial Statements and Exhibits

• The proposed acquisition covers a polyvinyl chloride and vinyl chloride monomer production site located in Wilhelmshaven, Germany.
• The transaction is subject to negotiation of definitive documentation, regulatory approvals, formal commencement of insolvency proceedings, and final approval by the creditors' committee.
• The filing was made under Item 7.01 Regulation FD Disclosure, meaning the information is furnished and not deemed filed for SEC liability purposes.
• The company cautioned that forward-looking statements regarding the transaction's timing and closing are subject to risks and uncertainties.

7.01 Regulation FD Disclosure

• Jonathan H. Baksht, age 51, will become Senior Vice President and Chief Financial Officer of Westlake Corporation, effective June 15, 2026.
• Baksht will also serve as SVP, CFO, and director of Westlake Chemical Partners GP LLC, effective June 15, 2026.
• Compensation includes a $200,000 sign-on cash award, RSUs with $1.8 million grant date fair value vesting June 15, 2029, base pay of $832,000 for 2026, and target bonuses of 90% (annual) and 275% (long-term incentive).
• Baksht previously served as CFO of Fortune Brands Innovations (May 2025–March 2026) and Pactiv Evergreen (May 2022–May 2025).

5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · 7.01 Regulation FD Disclosure · 9.01 Financial Statements and Exhibits

• On April 13, 2026, the DPPs filed a motion for preliminary approval of the settlement.
• Westlake agreed to pay $67 million to the DPP settlement class, subject to court approval and other conditions.
• The DPP settlement class agreed to release Westlake from certain claims; the settlement is not an admission of liability or wrongdoing.
• Claims by indirect purchaser plaintiffs in the same litigation remain pending.

8.01 Other Events