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Filing Details

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
1299505	James Chao	2801 Post Oak Boulevard, Suite 600 Houston TX 77056	Chairman	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2014-06-09	10,108	$45.70	110,234	No	4	M	Direct
Common Stock	Acquisiton	2014-06-09	32,838	$30.05	143,072	No	4	M	Direct
Common Stock	Disposition	2014-06-09	42,946	$82.01	100,126	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Option (right to buy)	Disposition	2014-06-09	10,108	$0.00	10,108	$45.70
Common Stock	Employee Option (right to buy)	Disposition	2014-06-09	32,838	$0.00	32,838	$30.05

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
20,218		2023-02-15	No	4	M	Direct
16,420		2022-02-17	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	40,000	Indirect	By Mother
Common Stock	92,010,554	Indirect	TTWF LP & TTWF GP LLC Trusts

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 June 9, 2014 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $81.79 to $82.34, 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 reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
Values and amounts reflect the results of a two-for-one stock split on March 18, 2014.
The stock options are exercisable in three installments of 33%, 33% and 34% on February 15, 2014, 2015 and 2016, respectively.
The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2013, 2014 and 2015, respectively.