Westlake Corporation (NYSE: WLK) today released its 2021 Environmental, Social and Governance Report and, concurrently, its Global Reporting Initiative (GRI) and Sustainability Accounting Standards Board (SASB) Appendix, as the company enhances its data reporting systems and reinforces its commitment to transparency. The ESG report includes Westlake’s fifth annual sustainability update and demonstrates how ESG practices are integrated throughout the corporation’s core business activities. The report highlights Westlake’s drive to improve sustainable practices across operations, products, and in management; maintain strong engagement in its communities; and deliver on customers’ expectations for sustainable innovate products. This integrated approach ensures that the corporation’s guiding ESG principles are applied across the global organization and that best practices from within strategic business units are shared and adopted. Over the past year, since the publication of its 2020 ESG

Westlake Chemical Partners (NYSE: WLKP) today provided the following information regarding 2021 investor tax reporting: As previously noted in the 2021 Investor Tax Reporting Package for your investment in Westlake Chemical Partners, LP, the Partnership will report items of international tax relevance to our partners on new Schedule K-3 beginning in tax year 2021. As we disclosed in our quarterly distribution press releases, all of our income is effectively connected with a United States trade or business. However, a limited number of unitholders (primarily foreign unitholders and unitholders having US international reporting obligations) may need the detailed information disclosed on Schedule K-3 for their specific reporting requirements. Our Schedule K-3 for tax year 2021 is now available online at www.taxpackagesupport.com/WLKP . This information may be necessary in the completion of your tax return. As such we encourage you to review the information contained on your Schedule K-3

The Board of Directors of Westlake Corporation (NYSE: WLK) today authorized the company to repurchase an additional $500 million of shares of its common stock under its existing share repurchase program. As of August 12, 2022, approximately 9.8 million shares of common stock had been acquired at an aggregate purchase price of approximately $600 million since the inception of its initial share repurchase program in 2011. After the expansion of the size of the current program, and as of August 12, 2022, an aggregate of approximately $550 million will be available for purchase under the program. This expansion to the program is effective immediately. Repurchases under this program will be made through the open market or in privately negotiated transactions. Decisions regarding the amount and the timing of repurchases under the program will be subject to the company’s available liquidity and cash on hand, applicable legal requirements, general market conditions and other factors. The

Record quarterly net sales of $4.5 billion, an increase of 57% vs. second quarter 2021 net sales Record quarterly net income of $858 million, an increase of 64% vs. second quarter 2021 net income Record quarterly EBITDA of $1.5 billion, an increase of 56% vs. second quarter 2021 EBITDA Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced record second quarter 2022 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data)     Three Months Ended June 30,   Six Months Ended June 30,     2022   2021   2022   2021                   Westlake Corporation                 Income from operations   $ 1,175   $ 720   $ 2,207   $ 1,066 Net income attributable to Westlake Corporation   $ 858   $ 522   $ 1,614   $ 764 Diluted earnings per common share   $ 6.60  

Declared quarterly distribution of $0.4714 per unit; 32 nd consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the second quarter of 2022 of $16.4 million, or $0.47 per limited partner unit, a decrease of $8.7 million compared to second quarter 2021 of $25.1 million. The Partnership's performance for the second quarter of 2022 was the result of solid operational performance across all ethylene units as well as positive margins on third party sales. The second quarter of 2021 benefited from an $8.7 million buyer deficiency fee as well as recovery of certain other costs from Westlake Corporation ("Westlake") attributable to an unplanned outage that occurred in the first half of 2021. The difference in net income for the second quarter of 2022 as compared to the second quarter of 2021 was primarily due to the recognition of the buyer deficiency fee during the prior-year period and

$0.4714 cents per unit distribution declared payable on August 25, 2022 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 32nd quarterly distribution announced by the Partnership since its initial public offering. The distribution will be payable on August 25, 2022, to unit holders of record on August 11, 2022. 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

Westlake Corporation (NYSE: WLK) will release its second quarter 2022 earnings prior to the market opening on Tuesday, August 2, 2022. 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 call, dial (800) 715-9871, or (646) 307-1963 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 5790614. The conference call will also be available via webcast at https://edge.media-server.com/mmc/p/e2ywjjui and the earnings release can be obtained via the company’s Web page at https://investors.westlake.com/news/default.aspx . A replay of the conference call will be available beginning two hours after the earnings call concludes at https://edge.media-server.com/mmc/p/e2ywjjui . About Westlake: Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston,