X0306 4 2022-02-18 0 0001262823 WESTLAKE CORP WLK 0001439749 Kenner Andrew 2801 POST OAK BOULEVARD, SUITE 600 HOUSTON TX 77056 0 1 0 0 SVP, Operations Common Stock 2022-02-18 4 A 0 4764 0 A 20362 D Represents shares of common stock that vested upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units granted to the Reporting Person on February 15, 2019 under the terms of the Issuer's 2013 Omnibus Incentive Plan. Andrew Kenner by J. Feng POA 2022-02-22