David Chao - Aug 13, 2021 Form 4 Insider Report for WESTLAKE CHEMICAL CORP (WLK)

Role: Director, 10%+ Owner
Signature: David Tsung-Hung Chao by J Feng POA
Stock symbol: WLK
Transactions as of: Aug 13, 2021
Transactions value $: $0
Form type: 4
Date filed: 8/16/2021, 01:55 PM
Next filing: Aug 15, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WLK	Common Stock	Options Exercise		+2.4K	+43.33%		7.94K	Aug 14, 2021	Direct	F1
holding	WLK	Common Stock						93.4M	Aug 13, 2021	TTWF LP & TTWF GP LLC	F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	WLK	Restricted Stock Units	Award	$0	+1.76K		$0.00	1.76K	Aug 13, 2021	Common Stock	1.76K		Direct	F1, F2
transaction	WLK	Restricted Stock Units	Options Exercise	$0	-2.4K	-100%	$0.00^*	0	Aug 14, 2021	Common Stock	2.4K		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
F2	All of the restricted stock units will vest on August 13, 2022.
F3	On August 14, 2020 the reporting person was granted 2,400 restricted stock units vesting on the first anniversary of the grant date.
F4	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.