Net income of $394 million increased 70% from fourth quarter 2022 Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced first quarter 2023 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data)     Three Months Ended March 31, 2023   Three Months Ended December 31, 2022   Three Months Ended March 31, 2022                     Westlake Corporation                   Net sales   $ 3,356     $ 3,299     $ 4,056   Income from operations   $ 536     $ 327     $ 1,032   Operating income margin     16%       10%       25%   Net income attributable to Westlake Corporation   $ 394    

Declared quarterly distribution of $0.4714 per unit; 35 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 2023 of $14.9 million, or $0.42 per limited partner unit, a decrease of $1.3 million compared to first quarter 2022 net income of $16.2 million. The Partnership's net income in the first quarter of 2023 was the result of strong production volumes with the decrease in net income compared to the first quarter of 2022 attributable to higher interest expense. Cash flows from operating activities in the first quarter of 2023 were $144.9 million, an increase of $40.1 million compared to first quarter 2022 cash flows from operating activities of $104.8 million. The increase was primarily due to favorable working capital changes. For the three months ended March 31, 2023, MLP distributable cash flow was $17.6 million, a decrease of $1.7 million compared to

$0.4714 per unit distribution declared payable on May 26, 2023 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 35th quarterly distribution announced by the Partnership since its initial public offering. The distribution will be payable on May 26, 2023, to unit holders of record on May 12, 2023. 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 Chemical Partners (NYSE: WLKP) today announced that Ms. Lisa A. Friel has been appointed to the board of directors of its general partner, Westlake Chemical Partners GP LLC. She will replace Ms. Angela A. Minas, who previously informed the company that she would resign from the board effective upon the appointment of her successor. Ms. Friel was the Managing Partner of Ernst & Young LLP’s San Antonio, Texas office from July 2012 until her retirement in September 2020. Ms. Friel began her career with Ernst & Young LLP in 1988. She is currently the Chair of the Board of Directors for the United Way of San Antonio. Ms. Friel holds a bachelor’s of science degree in Accounting and Business Administration from the University of Kansas and is a Certified Public Accountant. “We are extremely grateful to Angela for her service on our board. We wish her the best in her future endeavors,” stated James Chao, Chairman of Westlake Chemical Partners GP LLC. “We are very pleased that

Westlake Innovations, Inc., a subsidiary of Westlake Corporation (NYSE: WLK), today announced the company has invested in the Circular Plastics Fund. The fund seeks to accelerate the transition to a circular economy of plastics by scaling up advanced recycling technology companies that transform plastic waste streams into primary commodities used for new plastic products. Westlake’s investment builds upon the company’s commitment to helping develop a more sustainable future through continuous improvement in its own manufacturing as well as strategic investments in innovative technologies and startup firms. The Luxembourg-registered Circular Plastics Fund (CPF) is an Article 9 “dark green” impact fund, under the European Union’s Sustainable Finance Disclosure Regulation. Infinity Recycling manages the CPF, which was created to catalyze the world’s transition to a closed-loop plastics economy in which residual polymer waste streams, globally representing over 85% of plastic waste, are

Westlake Corporation (NYSE: WLK) will release its first quarter 2023 earnings prior to the market opening on Thursday, May 4, 2023. 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/BI4269c73571e746c5919547d7f3f9e036 . 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/m8sv6xfc 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, Europe and North

Westlake Chemical Partners (NYSE: WLKP) will release its first quarter 2023 earnings prior to the market opening on Thursday, May 4, 2023. 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.vevent.com/register/BI16a50f5d0c114b199639e3cf58096652 . 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/cmm2ahd6 and the earnings release can be obtained via the company's Web page at, https://investors.wlkpartners.com/corporate-profile/default.aspx . About Westlake Chemical Partners: Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production facilities

Westlake Corporation (NYSE: WLK) today announced that Westlake Epoxy will launch its new AZURES™ product range at the European Coatings Show 2023, to be held in Nuremberg, Germany, March 28 to 30, 2023. Westlake Epoxy’s Azures™ products are newly developed epoxy resins, modifiers and curing agents that are free of any SVHC- and CMR-labelled substances. As such, they provide better sustainable alternatives to existing technologies used in coatings, civil engineering and adhesives while keeping the same level of performance. “This is definitely another important milestone in Westlake Epoxy’s strategy to contribute to a safer and cleaner world,” said Ann Frederix, Vice President, Westlake Epoxy. Recently, Westlake Epoxy’s European business also confirmed its receipt of the 2022 Platinum Medal from EcoVadis, the world’s largest and most trusted provider of business sustainability ratings, and Westlake Epoxy’s Pernis, Netherlands site has successfully passed the audit for its International

Westlake Corporation (NYSE: WLK) today announced that Westlake Epoxy’s Pernis, Netherlands site has completed the first sale of certified mass balanced Bisphenol A (BPA). Additionally, the site received mass balance certification for its tracing and handling of sustainable materials in the production of epoxy products for its International Sustainability & Carbon Plus (ISCC+) certification. This is a significant step in Westlake Epoxy’s strategy to integrate renewable carbon materials into its raw material supply chain while reducing energy use and greenhouse gas emissions. All hydrocarbon feedstocks for the liquid epoxy resins produced at the Pernis location have been certified by mass balance to be replaceable by bio-based alternatives. These include the phenol and acetone used to manufacture BPA, as well as the propylene used to manufacture epichlorohydrin (ECH). ISCC+ provides an international, practical, transparent system for the certification of bio-based, bio-circular and