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Filing Details

Accession Number:: 0001140361-12-027653
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-05-29 16:03:45
Reporting Period:: 2012-05-25

Filing Date:: 2012-05-29
Accepted Time:: 2012-05-29 16:03:45
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	Yes

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	2012-05-25	35,300	$14.50	126,208	No	4	M	Direct
Common Stock	Disposition	2012-05-25	7,400	$55.07	118,808	No	4	S	Direct
Common Stock	Disposition	2012-05-25	1,000	$55.08	117,808	No	4	S	Direct
Common Stock	Disposition	2012-05-25	1,100	$55.09	116,708	No	4	S	Direct
Common Stock	Disposition	2012-05-25	3,370	$55.10	113,338	No	4	S	Direct
Common Stock	Disposition	2012-05-25	1,000	$55.11	112,338	No	4	S	Direct
Common Stock	Disposition	2012-05-25	100	$55.12	112,238	No	4	S	Direct
Common Stock	Disposition	2012-05-25	200	$55.12	112,038	No	4	S	Direct
Common Stock	Disposition	2012-05-25	206	$55.13	111,832	No	4	S	Direct
Common Stock	Disposition	2012-05-25	224	$55.15	111,608	No	4	S	Direct
Common Stock	Disposition	2012-05-25	500	$55.16	111,108	No	4	S	Direct
Common Stock	Disposition	2012-05-25	2,300	$55.17	108,808	No	4	S	Direct
Common Stock	Disposition	2012-05-25	500	$55.18	108,308	No	4	S	Direct
Common Stock	Disposition	2012-05-25	2,428	$55.19	105,880	No	4	S	Direct
Common Stock	Disposition	2012-05-25	6,158	$55.20	99,722	No	4	S	Direct
Common Stock	Disposition	2012-05-25	297	$55.21	99,425	No	4	S	Direct
Common Stock	Disposition	2012-05-25	338	$55.22	99,087	No	4	S	Direct
Common Stock	Disposition	2012-05-25	816	$55.23	98,271	No	4	S	Direct
Common Stock	Disposition	2012-05-25	3,107	$55.24	95,164	No	4	S	Direct
Common Stock	Disposition	2012-05-25	100	$55.24	95,064	No	4	S	Direct
Common Stock	Disposition	2012-05-25	2,248	$55.25	92,816	No	4	S	Direct
Common Stock	Disposition	2012-05-25	308	$55.26	92,508	No	4	S	Direct
Common Stock	Disposition	2012-05-25	700	$55.27	91,108	No	4	S	Direct
Common Stock	Disposition	2012-05-25	900	$55.28	90,908	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

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	2012-05-25	35,300	$0.00	35,300	$14.50

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2007-08-16	2014-08-16	No	4	M	Direct