X0306 4 2022-08-12 0 0001262823 WESTLAKE CORP WLK 0001726418 Chao David Tsung-Hung 2801 POST OAK BOULEVARD, SUITE 600 HOUSTON TX 77056 1 0 1 0 Common Stock 2022-08-13 4 M 0 1763 A 9702 D Common Stock 93405554 I TTWF LP & TTWF GP LLC Restricted Stock Units 2022-08-12 4 A 0 1446 0 A Common Stock 1446 1446 D Restricted Stock Units 2022-08-13 4 M 0 1763 0 D Common Stock 1763 0 D Restricted stock units convert into the Issuer's common stock on a one-for-one basis. All of the restricted stock units will vest on August 12, 2023. On August 13, 2021 the reporting person was granted 1,763 restricted stock units vesting on the first anniversary of the grant date. 92,010,554 shares of Issuer are held through TTWF LP, a Delaware limited partnership. 1,395,000 shares of the Issuer are held through TTWFGP LLC, a Delaware limited liability company that is the general partner of TTWF LP. Two trusts for the benefit of members of the Chao family, including the reporting person, are the managers of TTWFGP LLC. The limited partners of TTWF LP are five trusts, principally for the benefit of members of the Chao family, including the reporting person, and two corporations owned, indirectly or directly, by certain of these trusts and by other entities owned by members of the Chao family, including the reporting person. The reporting person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein. David Tsung-Hung Chao by J Feng POA 2022-08-15