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Filing Details

Accession Number:: 0001140361-17-009660
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2017-02-28 16:32:28
Reporting Period:: 2017-02-23

Filing Date:: 2017-02-28
Accepted Time:: 2017-02-28 16:32:28
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1262823	Westlake Chemical Corp	WLK	Industrial Organic Chemicals (2860)	760346924

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1299403	Albert Chao	2801 Post Oak Boulevard, Suite 600 Houston TX 77056	President & Ceo	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2017-02-23	42,180	$15.81	316,198	No	4	M	Direct
Common Stock	Disposition	2017-02-23	42,180	$63.35	274,018	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Option (right to buy)	Disposition	2017-02-23	42,180	$0.00	42,180	$15.81

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2017-02-23	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	92,010,554	Indirect	TTWF LP & TTWFGP LLC

Footnotes

In accordance with the Securities and Exchange Commission's No Action Letter dated June 25, 2008, we have aggregated the sales that occurred on February 23, 2017 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $63.28 to 63.49, 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 (1) to this Form 4.
The stock options are exercisable in three equal installments on February 23, 2008, 2009 and 2010.
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.