Westlake Corporation (NYSE: WLK) today announced that Westlake Epoxy’s Pernis, Netherlands site has received International Sustainability & Carbon Plus (ISCC+) certification. The site received mass balance certification for its tracing and handling of sustainable materials in the production of epoxy products. 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. ISCC+ provides an international, practical, transparent system for the certification of bio-based, bio-circular and circular raw materials at each level of the supply chain. The ISCC+ certification recognizes Westlake Epoxy’s (formerly known as Hexion BV) commitment to environmentally, socially and economically sustainable production by tracking its existing mix of feedstocks and replacing fossil materials with renewable resources. Aromatic monomers for the liquid epoxy resins produced at the

Rating places company among the top 1% of companies assessed by EcoVadis Westlake Corporation (NYSE: WLK) today announced that Westlake Epoxy’s European business has received a Platinum rating from EcoVadis, the world’s largest and most trusted provider of business sustainability ratings. This is their highest rating for environmental and social performance. Westlake Epoxy is a leading global producer of epoxy resins, modifiers and curing agents for high-performance materials, coatings and composites. It recently closed its acquisition of Hexion’s epoxy business, a leading supplier of materials for coatings and composites used in such high-growth applications as wind turbine blades and light-weight automotive structural components. “This milestone underscores how and where we want to grow – with operational and environmental excellence and a focus on bringing value across the business, including the energy transition,” said Larry Schubert, vice president of corporate development 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, 2021 with the Securities and Exchange Commission on March 2, 2022. 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 – 2021 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