Westlake Corporation (NYSE: WLK) today announced that it will host an investor event focused on its Housing & Infrastructure Products (“HIP”) businesses on Thursday, June 13, 2024, from 9:00 a.m. to 1:00 p.m. Eastern Time. During the event, Albert Chao, President and Chief Executive Officer; Steve Bender, Executive Vice President and Chief Financial Officer; Robert Buesinger, Executive Vice President – Housing & Infrastructure Products, IT & Digital; and the leaders of Westlake Royal Building Products, Westlake Pipe & Fittings, and Westlake Global Compounds, will present an in-depth review of the Company’s HIP segment and its financials. The event will cover Westlake’s integrated and expanded business portfolio, including the breadth of diversified and market-leading products made by the HIP businesses, which serve the home building and construction markets, municipal water and sewer infrastructure, and automotive and healthcare industries. The event will take place in

Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") announced that it filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2023 with the Securities and Exchange Commission on February 28, 2024. A copy of this 10-K may be found on the Partnership's website, www.wlkpartners.com , by selecting the "Investor Relations" tab, then "SEC Filings." Unitholders of the Partnership may receive a hard copy of its Annual Report on Form 10-K, including complete audited financial statements, free of charge. Requests should be submitted in writing to Westlake Chemical Partners LP – 2023 Form 10-K, 2801 Post Oak Blvd., Suite 600, Houston, TX 77056. About Westlake Chemical Partners LP Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production facilities and other qualified assets. Headquartered in Houston, the Partnership owns a 22.8% interest in Westlake Chemical OpCo LP. Westlake Chemical OpCo

Westlake Chemical Partners LP (the “Partnership”) (NYSE: WLKP) today provided an update on the expected availability of the Partnership’s 2023 Investor Tax Packages including Schedule K-1 for its common unitholders. Historically, the Partnership’s Investor Tax Packages have been available by the end of February for the preceding tax year; however, the timing of the availability of Partnership’s 2023 Investor Tax Packages is dependent upon actions of the U.S. Congress and the Biden administration with regard to the passage, or not, of the Tax Relief for American Families and Workers Act of 2024, (referred to as “H.R. 7024”). H.R. 7024 was passed by the House of Representatives on January 31, 2024 and is now among the legislative items that the U.S. Senate may consider after it reconvenes on Monday, February 26, 2024 from its current two-week recess. This legislation includes changes in tax law which would be applied retroactively to the 2023 tax year. As passed by the House of

Westlake Corporation (NYSE: WLK) announced today that its Westlake Epoxy Duisburg, Germany manufacturing site has received the International Sustainability & Carbon Plus (ISCC PLUS) certification. The site received mass balance certification for its tracing and handling of sustainable materials in the production of epoxy specialty products. This is the second Westlake Epoxy site in Europe to receive ISCC PLUS certification. The goal is to achieve this certification for all Westlake Epoxy sites in Europe in the near future. “This marks a significant step in Westlake Epoxy’s strategy to integrate renewable carbon materials into its raw material supply chain while reducing energy consumption and greenhouse gas emissions,” said Ann Frederix, Vice President - Epoxy. “The ISCC PLUS certification creates opportunities for our customers to access a wider range of innovative, renewable attributed and lower-carbon footprint products. The mass balancing concept ensures equivalent performance

Record Housing and Infrastructure Products (HIP) annual income from operations of $710 million with a 17% income from operations margin and a 23% EBITDA margin Generated $2.3 billion of net cash from operating activities and $1.3 billion of free cash flow in 2023 Performance and Essential Materials (PEM) results impacted by Identified Items totaling $625 million Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced fourth quarter and full year 2023 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data and percentages)       Three Months Ended   Twelve Months Ended     December 31,   September 30,   December 31,   December 31,     2023   2023   2022   2023   2022 Westlake Corporation                     Net sales   $ 2,826     $ 3,115     $ 3,299     $ 12,548     $ 15,794

Record Housing and Infrastructure Products (HIP) annual income from operations of $710 million with a 17% income from operations margin and a 23% EBITDA margin Generated $2.3 billion of net cash from operating activities and $1.3 billion of free cash flow in 2023 Performance and Essential Materials (PEM) results impacted by Identified Items totaling $625 million Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced fourth quarter and full year 2023 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data and percentages) Three Months Ended Twelve Months Ended December 31, September 30, December 31, December 31, 2023 2023 2022 2023 2022 Westlake Corporation Net sales $ 2,826 $ 3,115 $ 3,299 $ 12,548 $ 15,794 Income (loss) from operations

$0.50 per share dividend declared payable on March 14, 2024 The Board of Directors of Westlake Corporation (NYSE: WLK) today declared a regular dividend distribution of 50 cents per share for the fourth quarter of 2024. This dividend will be payable on March 14, 2024, to stockholders of record on February 28, 2024. This is the 78th successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004. The statements in this release that are not historical facts, including statements regarding future repurchases of common stock, are forward-looking statements. These forward-looking statements are subject to significant risks and uncertainties. Actual results could differ materially, based on factors including, but not limited to, the ultimate timing, outcome and results of integrating the operations of recent acquisitions; general economic and business conditions; the cyclical nature of the chemical and building products industries;

Westlake Corporation (NYSE: WLK) will release its fourth quarter and full year 2023 earnings prior to the market opening on Tuesday, February 20, 2024. The company will host a conference call at 11:00 a.m. Eastern Time (10:00 a.m. Central Time) on the same day to discuss the earnings release. To access the conference by phone, it is necessary to pre-register at https://register.vevent.com/register/BIb0686f53c7f44babb49b408c59ec0d23 . Once registered, you will receive a phone number and unique PIN number. When you dial in, you will input the PIN number to be placed into the call. The conference call and replay will be available via webcast at https://edge.media-server.com/mmc/p/fg9k946y and the earnings release can be obtained via the company’s Web page at https://investors.westlake.com/news/default.aspx . About Westlake: Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, with operations in Asia,