WESTLAKE CORP — Director's Dealing 2017

Nov 27, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2017-11-22

Reporting Person: Chao James (Director, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-11-22	Common Stock	M	10109	$45.6975	Acquired	129078	Direct
2017-11-22	Common Stock	S	10109	$95.203	Disposed	118969	Direct
2017-11-24	Common Stock	M	10109	$45.6975	Acquired	129078	Direct
2017-11-24	Common Stock	M	23917	$68.09	Acquired	152995	Direct
2017-11-24	Common Stock	M	32000	$63.9775	Acquired	184995	Direct
2017-11-24	Common Stock	S	66026	$94.611	Disposed	118969	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-11-22	Employee Option (right to buy)	$45.6975	M	10109	Disposed	2023-02-15	Common Stock (10109)	Direct
2017-11-24	Employee Option (right to buy)	$45.6975	M	10109	Disposed	2023-02-15	Common Stock (10109)	Direct
2017-11-24	Employee Option (right to buy)	$68.09	M	23917	Disposed	2025-02-20	Common Stock (23917)	Direct
2017-11-24	Employee Option (right to buy)	$63.9775	M	32000	Disposed	2024-02-14	Common Stock (32000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	92010554	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $95.00 to $95.40, inclusive. The reporting person undertakes to provide to Westlake Chemical Corp., any security holder of Westlake Chemical Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $94.11 to $94.90, inclusive. The reporting person undertakes to provide to Westlake Chemical Corp., any security holder of Westlake Chemical Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote

F3: The stock options are excercisable in three equal installments on February 15, 2014, 2015 and 2016.

F4: The stock options are excercisable in three equal installments on February 20, 2016, 2017 and 2018.

F5: The stock options are excercisable in three equal installments on February 14, 2015, 2016 and 2017.

F6: 92,010,554 shares of Issuer are held through 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 that 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 investment and voting power with respect to the shares beneficially owned by TTWF LP. The reporting person disclaims beneficial ownership of the shares except to the extent of her pecuniary interest therein.