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Filing Details

Accession Number:: 0001140361-12-028049
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-05-31 17:01:21
Reporting Period:: 2012-05-29

Filing Date:: 2012-05-31
Accepted Time:: 2012-05-31 17:01:21
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	Acquisiton	2012-05-29	70,194	$14.24	161,102	No	4	M	Direct
Common Stock	Disposition	2012-05-29	4,957	$56.74	156,145	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,400	$56.75	154,745	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,000	$56.76	153,745	No	4	S	Direct
Common Stock	Disposition	2012-05-29	3,800	$56.78	149,945	No	4	S	Direct
Common Stock	Disposition	2012-05-29	8,300	$56.79	141,645	No	4	S	Direct
Common Stock	Disposition	2012-05-29	5,849	$56.80	135,796	No	4	S	Direct
Common Stock	Disposition	2012-05-29	3,139	$56.81	132,657	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,000	$56.82	131,657	No	4	S	Direct
Common Stock	Disposition	2012-05-29	903	$56.83	130,754	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$56.83	130,654	No	4	S	Direct
Common Stock	Disposition	2012-05-29	462	$56.84	130,192	No	4	S	Direct
Common Stock	Disposition	2012-05-29	200	$56.84	129,992	No	4	S	Direct
Common Stock	Disposition	2012-05-29	300	$56.85	129,692	No	4	S	Direct
Common Stock	Disposition	2012-05-29	366	$56.86	129,326	No	4	S	Direct
Common Stock	Disposition	2012-05-29	2,079	$56.87	127,247	No	4	S	Direct
Common Stock	Disposition	2012-05-29	600	$56.87	126,647	No	4	S	Direct
Common Stock	Disposition	2012-05-29	399	$56.88	126,248	No	4	S	Direct
Common Stock	Disposition	2012-05-29	204	$56.90	126,044	No	4	S	Direct
Common Stock	Disposition	2012-05-29	20	$56.91	126,024	No	4	S	Direct
Common Stock	Disposition	2012-05-29	2,646	$56.92	123,378	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$56.93	123,278	No	4	S	Direct
Common Stock	Disposition	2012-05-29	1,120	$56.93	122,158	No	4	S	Direct
Common Stock	Disposition	2012-05-29	100	$56.94	122,058	No	4	S	Direct
Common Stock	Disposition	2012-05-29	498	$56.95	121,560	No	4	S	Direct
Common Stock	Disposition	2012-05-29	3,540	$56.96	118,020	No	4	S	Direct
Common Stock	Disposition	2012-05-29	2,178	$56.97	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	2012-05-29	70,194	$0.00	70,194	$14.24

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
35,097	2011-02-13	2019-02-13	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	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.