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Filing Details

Accession Number:: 0001140361-12-050552
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-12-11 16:58:14
Reporting Period:: 2012-12-07

Filing Date:: 2012-12-11
Accepted Time:: 2012-12-11 16:58:14
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
1299505	James Chao	2801 Post Oak Blvd. Houston TX 77056	Chairman	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
Common Stock	Acquisiton	2012-12-07	30,193	$20.53	146,035	No	4	M	Direct
Common Stock	Disposition	2012-12-07	8,696	$75.23	137,339	No	4	S	Direct
Common Stock	Disposition	2012-12-07	5,077	$75.25	132,262	No	4	S	Direct
Common Stock	Disposition	2012-12-07	1,600	$72.26	130,662	No	4	S	Direct
Common Stock	Disposition	2012-12-07	300	$75.27	130,362	No	4	S	Direct
Common Stock	Disposition	2012-12-07	1,200	$75.30	129,162	No	4	S	Direct
Common Stock	Disposition	2012-12-07	1,300	$75.31	127,862	No	4	S	Direct
Common Stock	Disposition	2012-12-07	500	$75.33	127,362	No	4	S	Direct
Common Stock	Disposition	2012-12-07	2,200	$75.34	125,162	No	4	S	Direct
Common Stock	Disposition	2012-12-07	5,220	$75.35	119,942	No	4	S	Direct
Common Stock	Disposition	2012-12-07	400	$75.39	119,542	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.40	119,442	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.43	119,242	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.44	119,042	No	4	S	Direct
Common Stock	Disposition	2012-12-07	300	$75.48	118,742	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.50	118,542	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.50	118,342	No	4	S	Direct
Common Stock	Disposition	2012-12-07	400	$75.51	117,942	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.53	117,742	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.55	117,642	No	4	S	Direct
Common Stock	Disposition	2012-12-07	200	$75.58	117,442	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.59	117,342	No	4	S	Direct
Common Stock	Disposition	2012-12-07	300	$75.65	117,042	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.66	116,942	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.67	116,842	No	4	S	Direct
Common Stock	Disposition	2012-12-07	100	$75.68	116,742	No	4	S	Direct
Common Stock	Disposition	2012-12-07	900	$75.71	115,842	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	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)	Acquisiton	2012-12-07	30,193	$0.00	30,193	$20.53

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
15,797		2020-02-26	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	20,000	Indirect	By Mother
Common Stock	150,040	Indirect	By Brother Albert Chao
Common Stock	46,005,277	Indirect	By TTWF LP & TTWF GP LLC Trusts

Footnotes

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.
The stock options, representing the right to purchase a total of 47,390 shares, became (or will become) exercisable in three equalinstallments on February 26, 2011, 2012, and 2013.