Deal Brings Expansion for Westlake’s Housing & Infrastructure Products Segment Westlake Corporation (NYSE: WLK) announced today that it has entered into an agreement to acquire the global compounding solutions businesses of the ACI/Perplastic Group (collectively, “ACI”). ACI is a Portugal-based global manufacturer of specialty materials serving the wire and cable sectors, which helps expand Westlake’s offerings. “The combination of ACI with Westlake’s existing compounding business will present an excellent strategic fit and opportunity to integrate with our Housing & Infrastructure Products (HIP) business. It will allow us to further expand Westlake Global Compounds and add new specialty products and technology to our existing portfolio,” said Jean-Marc Gilson, Westlake’s President and Chief Executive Officer. “ACI is an impressive business with an outstanding reputation for its innovative, high-value products. We look forward to working with their talented team once they join

Westlake Corporation (NYSE: WLK) today announced an advance in the company’s sustainability objectives to further reduce its carbon emissions intensity by 20% by 2030, from a 2016 baseline, which is one of the company’s sustainability goals. Westlake recently entered into an agreement with a solar renewable-energy three-farm project that generates approximately 160,000 megawatt-hours per year of renewable energy and purchased the associated renewable energy certificates (RECs). The RECs are utilized as part of this multi-year purchase agreement to offset Westlake’s electricity consumption attributed to powering its operations. Westlake is evaluating the best use of REC’s to enhance its downstream product offerings. “The incorporation of purchased RECs into our broader sustainability strategy is an important step in our ongoing efforts to cut greenhouse gas emissions,” said Tim Hunt, Vice President, Corporate Development and Sustainability. “This initiative not only advances our own

$0.53 per share dividend declared payable on September 4, 2025 The Board of Directors of Westlake Corporation (NYSE: WLK) today declared a regular dividend distribution of $0.53 per share for the second quarter of 2025. This dividend will be payable on September 4, 2025 to stockholders of record on August 19, 2025. Westlake announced its first dividend on November 11, 2004 and has successively been paying and increasing its dividend for the past 20 years. The statements in this release that are not historical facts, including statements regarding future payment of dividend, are forward-looking statements. These forward-looking statements are subject to significant risks and uncertainties. For more detailed information about the factors that could cause actual results to differ materially, please refer to Westlake’s Annual Report on Form 10-K for the year ended December 31, 2024, which was filed with the SEC in February 2025, and Westlake’s Quarterly Report on Form 10-Q for the quarter

Declared quarterly distribution of $0.4714 per unit; 44 th consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the second quarter of 2025 of $14.6 million, or $0.41 per limited partner unit, which was in line with second quarter 2024 net income of $14.4 million. Cash flows from operating activities in the second quarter of 2025 were $9.1 million, a decrease of $112.8 million compared to second quarter 2024 cash flows from operating activities of $121.9 million. For the three months ended June 30, 2025, MLP distributable cash flow was $15.0 million, a decrease of $2.1 million compared to second quarter 2024 MLP distributable cash flow of $17.1 million. The decrease in MLP distributable cash flow and associated trailing twelve-month coverage ratio was primarily due to higher maintenance capital expenditures as a result of the Petro 1 turnaround. Compared to the first quarter of

Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced second quarter 2025 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages)       Three Months Ended June 30, 2025   Three Months Ended March 31, 2025   Three Months Ended June 30, 2024               Westlake Corporation             Net sales   $ 2,953     $ 2,846     $ 3,207   Income (loss) from operations   $ (109 )   $ (32 )   $ 406   Net income (loss) attributable to Westlake Corporation   $ (142 )   $ (40 )   $ 313   Diluted earnings (loss) per common share   $ (1.11 )   $