$0.53 per share dividend declared payable on June 11, 2026 The Board of Directors of Westlake Corporation (NYSE: WLK) today declared a regular dividend distribution of $0.53 per share for the first quarter of 2026. This dividend will be payable on June 11, 2026 to stockholders of record on May 27, 2026. Westlake announced its first dividend on November 11, 2004 and has successively been paying and increasing its dividend for the past 22 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, 2025, which was filed with the SEC in February 2026, and Westlake’s Quarterly Report on Form 10-Q for the quarter ended March

Declared quarterly distribution of $0.4714 per unit; 47 th consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the first quarter of 2026 of $14.2 million, or $0.40 per limited partner unit, which was above first quarter 2025 net income of $4.9 million. Cash flows from operating activities in the first quarter of 2026 were $110.2 million, an increase of $64.4 million compared to first quarter 2025 cash flows from operating activities of $45.8 million, due to higher production and sales volume as the result of the prior year's Petro 1 turnaround. For the three months ended March 31, 2026, MLP distributable cash flow was $17.9 million, an increase of $13.2 million compared to first quarter 2025 MLP distributable cash flow of $4.7 million. The increase in MLP distributable cash flow and associated trailing twelve-month coverage ratio was primarily due to higher production and sales

Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced first quarter 2026 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages) Three Months Ended March 31, 2026 Three Months Ended December 31, 2025 Three Months Ended March 31, 2025 Westlake Corporation Net sales $ 2,652 $ 2,533 $ 2,846 Loss from operations $ (172 ) $ (671 ) $ (32 ) Net loss attributable to Westlake Corporation $ (169 ) $ (544 ) $ (40 ) Diluted loss per common share $ (1.31 ) $ (4.22 ) $ (0.31

$0.4714 per unit distribution declared payable on June 1, 2026 The Board of Directors of Westlake Chemical Partners GP LLC, the general partner of Westlake Chemical Partners LP (the "Partnership") (NYSE:WLKP), has declared a distribution of $0.4714 per unit. This is the 47th quarterly distribution announced by the Partnership since its initial public offering. The distribution will be payable on June 1, 2026, to unit holders of record on May 14, 2026. This release is intended to be a qualified notice under Treasury Regulation Section 1.1446-4(b). Brokers and nominees should treat one hundred percent (100.0%) of the Partnership’s distributions to non-U.S. investors as being attributable to income that is effectively connected with a United States trade or business. Accordingly, the Partnership’s distributions to non-U.S. investors are subject to federal income tax withholding at the highest applicable effective tax rate. About Westlake Chemical Partners LP Westlake Chemical Partners is

Westlake Corporation (NYSE: WLK) today announced that its Westlake Epoxy plant in Deer Park, Texas, has received International Sustainability & Carbon Certification (ISCC) PLUS. The certification covers liquid epoxy resins (LER), solid epoxy resins (SER), and liquid epoxy blends that combine LER with reactive modifiers, serving key end-use segments such as industrial coatings, construction, wind energy, composites, automotive and electronics. Starting today, existing and new customers will have access to these ISCC+ mass balance-attributed content of certified renewable feedstock. These solutions support sustainability objectives while maintaining the same quality, performance, and specifications as our standard epoxy resins. “This is an important milestone for Westlake Epoxy in North America and a key step in bringing more renewable raw materials into our global supply chain,” said Brian Powers, Senior Vice President, Performance & Essential Materials. “ISCC PLUS mass

Westlake Chemical Partners (NYSE: WLKP) will release its first quarter 2026 earnings prior to the market opening on Tuesday, May 5, 2026. The company will host a conference call at 1:00 p.m. Eastern Time (12:00 p.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-conf.media-server.com/register/BI15886588e6004070bc18c354348f7575 . 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/493g3eiw and the earnings release can be obtained via the company's Web page at https://investors.wlkpartners.com . About Westlake Chemical Partners: Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production facilities and other qualified

Westlake Corporation (NYSE: WLK) will release its first quarter 2026 earnings prior to the market opening on Tuesday, May 5, 2026. 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-conf.media-server.com/register/BI34ea020237b448069214d7ccf868ece8 . 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/p33g6sjv and the earnings release can be obtained via the company’s Web page at https://investors.westlake.com . 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, Europe and North America, we