X0306 4 2017-08-21 0 0001262823 WESTLAKE CHEMICAL CORP WLK 0001299504 Jenkins Dorothy C 2801 POST OAK BOULEVARD, SUITE 600 HOUSTON TX 77056 1 0 1 0 Common Stock 2017-08-21 4 M 0 603 A 46721 D Common Stock 2017-08-22 4 M 0 357 A 47078 D Common Stock 92010554 I TTWF LP and TTWFGP LLC Restricted Stock Units 2017-08-21 4 M 0 603 0 D Common Stock 603 603 D Restricted Stock Units 2017-08-22 4 M 0 357 0 D Common Stock 357 0 D Restricted stock units convert into the Issuer's shares of common stock on a one-to-one basis. 92,010,554 shares of the common stock of the Issuer are held by TTWF LP, a Delaware limited partnership. Two trusts for the benefit of members of the Chao family, including the reporting person, are the managers of TTWFGP LLC, a Delaware limited liability company, which is the general partner of TTWF LP. 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 shares voting and dispositive power with respect to the shares of the common stock beneficially owned by TTWF LP. The reporting person disclaims beneficial ownership of the shares except to the extent of her pecuniary interest therein. On August 21, 2015, the reporting person was granted 1,809 restricted stock units vesting in three equal installments beginning on the first anniversary of the grant date. On August 22, 2014, the reporting person was granted 1,071 restricted stock units vesting in three equal installments beginning on the first anniversary of the grant date. Dorothy Jenkins by Feng POA 2017-08-22