Filing Details

TTWF is the owner of 92,010,554 shares of Common Stock of Westlake Chemical Corporation. TTWFGP is the owner of an additional 1,395,000 shares of Common Stock of Westlake Chemical Corporation and also serves as the General Partner of TTWF and may be deemed to share beneficial ownership of the 92,010,554 shares of Common Stock of which TTWF is the owner.

Two trusts held for the benefit of the members of the Chao family, including James Chao, Dorothy C. Jenkins and Albert Chao, are the managers of TTWFGP, which is the general partner of TTWF. The limited partners of TTWF are five trusts held principally for the benefit of the members of the Chao family, including James Chao, Dorothy C. Jenkins and Albert Chao, and two corporations owned, directly or indirectly, by certain of these trusts and by other entities owned by the Chao family, including James Chao, Dorothy C. Jenkins and Albert Chao. The Reporting Persons share voting and dispositive power with respect to the shares of which TTWF is the owner and the shares of which TTWFGP is the owner. James Chao, Dorothy C. Jenkins and Albert Chao disclaim beneficial ownership of the 92,010,554 shares held by TTWF and the 1,395,000 shares owned by TTWFGP except to the extent of their respective pecuniary interests therein.

James Chao is the owner of 100,512 shares of Common Stock, and 237,799 vested Stock Options, as well as 57,030 unvested Stock Options, 14,683 unvested RSUs, and 14,727 unvested PSUs that will vest in favor of James Chao within 60 days of December 31, 2021.  The 237,799 vested Stock Options, along with the 57,030 unvested Stock Options that will vest in favor of James Chao within 60 days of December 31, 2021, are each convertible within 60 days of December 31, 2021, at a ratio of one Stock Option per share of Common Stock.  The 14,683 unvested RSUs and the 14,727 unvested PSUs that will vest in favor of James Chao within 60 days of December 31, 2021, each represent a contingent right to receive one shares of the issuer’s Common Stock within 60 days of December 31, 2021.  The foregoing number of PSUs reflects the target number of PSUs issuable to James Chao pursuant to a February 2019 Performance Stock Unit Award and is subject to adjustment pending final determination of the Issuer’s compensation committee.  The shares of Common Stock, vested and unvested Stock Options, and unvested RSUs and PSUs of which James Chao is the owner, together with the 92,010,554 shares of Common Stock of which TTWF is the owner, and the 1,395,000 shares of Common Stock of which TTWFGP is the owner add up to the number of shares listed in Item 9 of James Chao’s respective cover page. James Chao disclaims beneficial ownership of the shares of Common Stock over which Albert Chao and Dorothy C. Jenkins have sole voting and dispositive power. James Chao also disclaims beneficial ownership over the 92,010,554 shares held by TTWF and the 1,395,000 shares held by TTWFGP, except to the extent of his pecuniary interest therein.

Dorothy C. Jenkins is the owner of 72,015 shares of Common Stock, which together with the 92,010,554 shares of Common Stock of which TTWF is the owner and the 1,395,000 shares of Common Stock of which TTWFGP is the owner, add up to the number of shares listed in Item 9 of Dorothy C. Jenkins’ respective cover page. Dorothy C. Jenkins disclaims beneficial ownership of the shares of Common Stock over which Albert Chao and James Chao have sole voting and dispositive power. Dorothy C. Jenkins also disclaims beneficial ownership over the 92,010,554 shares held by TTWF and the 1,395,000 shares held by TTWFGP, except to the extent of her pecuniary interest therein.

Albert Chao is the owner of 441,939 shares of Common Stock, and 409,596 vested Stock Options, as well as 82,526 unvested Stock Options, 18,354 unvested RSUs, and 18,409 unvested PSUs that will vest in favor of Albert Chao within 60 days of December 31, 2021.  The 409,596 vested Stock Options, along with the 82,526 unvested Stock Options that will vest in favor of Albert Chao within 60 days of December 31, 2021, are each convertible within 60 days of December 31, 2021, at a ratio of one Stock Option per share of Common Stock.  The 18,354 unvested RSUs and the 18,409 unvested PSUs that will vest in favor of Albert Chao within 60 days of December 31, 2021 each represent a contingent right to receive one shares of the issuer’s Common Stock within 60 days of December 31, 2021.  The foregoing number of PSUs reflects the target number of PSUs issuable to Albert Chao pursuant to a February 2019 Performance Stock Unit Award and is subject to adjustment pending final determination of the Issuer’s compensation committee.  The shares of Common Stock, vested and unvested Stock Options, and unvested RSUs and PSUs of which Albert Chao is the owner, together with the 92,010,554 shares of Common Stock of which TTWF is the owner, and the 1,395,000 shares of Common Stock of which TTWFGP is the owner add up to the number of shares listed in Item 9 of Albert Chao’s respective cover page.  Albert Chao disclaims beneficial ownership of the shares of Common Stock over which James Chao and Dorothy C. Jenkins have sole voting and dispositive power. Albert Chao also disclaims beneficial ownership over the 92,010,554 shares held by TTWF and the 1,395,000 shares held by TTWFGP, except to the extent of his pecuniary interest therein.

	Albert Chao
	By:	/s/ Albert Chao
		Albert Chao

	TTWFGP LLC
	By:	/s/ Albert Chao
		Name:	Albert Chao
		Title:	Authorized Representative
	By:	/s/ James Chao
		Name:	James Chao
		Title:	Authorized Representative