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

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, 2022 with the Securities and Exchange Commission on March 1, 2023. 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 – 2022 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 Corporation (NYSE: WLK) today announced that Westlake Epoxy’s European business received a 2022 Platinum Medal from EcoVadis, the world’s largest and most trusted provider of business sustainability ratings. Westlake Epoxy was also rated at this level in 2021 which positions it at the top 1% of companies assessed by EcoVadis. Westlake Epoxy is a leading global producer of epoxy resins, modifiers and curing agents for high-performance materials. It serves a variety of industries including aerospace, automotive, civil engineering and construction, composites and wind energy, electronics, electrical equipment, and marine and protective coatings. “Sustainability is key to Westlake’s strategy and integrated in our operations and product offering,” said Larry Schubert, vice president, corporate development and sustainability for Westlake Corporation. “This EcoVadis Platinum rating reaffirms our commitment to create a sustainable present and future. True to our Mission of Enhancing

Declared quarterly distribution of $0.4714 per unit; 34 th consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the fourth quarter of 2022 of $16.8 million, or $0.48 per limited partner unit, a decrease of $12.7 million compared to fourth quarter 2021 net income of $29.5 million. Net income in the fourth quarter of 2021 benefitted from a $32 million buyer deficiency fee resulting from an unplanned outage related to the Petro 2 turnaround at Westlake Chemical OpCo, LP ("OpCo"). The decrease in net income in the fourth quarter of 2022 when compared to the prior-year period was a result of a lower buyer deficiency fee of $10 million recorded in the period as well as higher interest expense, partially offset by higher production at OpCo. Cash flows from operating activities in the fourth quarter of 2022 were $122.6 million, an increase of $100.7 million compared to fourth quarter 2021

Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced fourth quarter and record full-year 2022 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data)     Three Months Ended December 31,   Twelve Months Ended December 31,     2022   2021   2022   2021                   Westlake Corporation                 Net sales   $ 3,299     $ 3,507     $ 15,794     $ 11,778   Income from operations   $ 327     $ 873     $ 3,050     $ 2,800  

$0.3570 per share dividend declared payable on March 16, 2023 The Board of Directors of Westlake Corporation (NYSE:WLK) declared today a regular dividend distribution of $0.3570 per share for the fourth quarter of 2022. This dividend will be payable on March 16, 2023, to stockholders of record on March 1, 2023. This is the 74 th successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004. 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 provide the building blocks for vital solutions — from housing and construction, to packaging and healthcare, to automotive and consumer. For more information, visit the Company's web site at www.westlake.com . View source version on businesswire.com: https://www.businesswire.com/news/home/20230217005264/en/ Media Inquiries:
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Westlake Chemical Partners (NYSE: WLKP) will release its fourth quarter and full year 2022 earnings prior to the market opening on Tuesday, February 21, 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/BI9783ef61b8b547ef9b507fc63dc0f073 . 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/n8a3yw3a 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

Westlake Corporation (NYSE: WLK) will release its fourth quarter and full year 2022 earnings prior to the market opening on Tuesday, February 21, 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/BI653627905a3741a89e224aa220a66fbc . 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/r2a7ck67 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,