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Filing Details

Accession Number:: 0001140361-12-028051
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-05-31 17:02:41
Reporting Period:: 2012-05-29

Filing Date:: 2012-05-31
Accepted Time:: 2012-05-31 17:02:41
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

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2012-05-29	434	$56.98	115,408	No	4	S	Direct
Common Stock	Disposition	2012-05-29	300	$56.99	115,108	No	4	S	Direct
Common Stock	Disposition	2012-05-29	500	$57.00	114,608	No	4	S	Direct
Common Stock	Disposition	2012-05-29	3,636	$57.01	110,972	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,964	$57.02	109,008	No	4	S	Direct
Common Stock	Disposition	2012-05-29	4,700	$57.03	104,308	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$57.03	104,208	No	4	S	Direct
Common Stock	Disposition	2012-05-29	600	$57.04	103,608	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,829	$57.05	101,779	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,300	$57.07	100,479	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,100	$57.08	99,379	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$57.08	99,279	No	4	S	Direct
Common Stock	Disposition	2012-05-29	2,800	$57.10	96,479	No	4	S	Direct
Common Stock	Disposition	2012-05-29	800	$57.11	95,679	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,271	$57.15	94,408	No	4	S	Direct
Common Stock	Disposition	2012-05-29	500	$57.16	93,908	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,500	$57.17	92,408	No	4	S	Direct
Common Stock	Disposition	2012-05-29	200	$57.17	92,208	No	4	S	Direct
Common Stock	Disposition	2012-05-29	200	$57.18	92,008	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$57.19	91,908	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$57.19	91,808	No	4	S	Direct
Common Stock	Disposition	2012-05-29	200	$57.21	91,608	No	4	S	Direct
Common Stock	Disposition	2012-05-29	200	$57.23	91,408	No	4	S	Direct
Common Stock	Disposition	2012-05-29	500	$57.27	90,908	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
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 Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	20,000	Indirect	By Mother
Common Stock	120,875	Indirect	By Brother Albert Chao
Common Stock	46,005,277	Indirect	TTWF LP and TTWFGP LLC Trusts

Footnotes

Even though reporting person and reporting person's mother share a household, 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.
Even though reporting person and reporting person's brother, Albert Chao, share a household, 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.