WESTLAKE CORP — Director's Dealing 2012

May 31, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-05-29

Reporting Person: Chao James (Director, Chairman, 10% Owner, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-29	Common Stock	S	434	$56.98	Disposed	115408	Direct
2012-05-29	Common Stock	S	300	$56.99	Disposed	115108	Direct
2012-05-29	Common Stock	S	500	$57.00	Disposed	114608	Direct
2012-05-29	Common Stock	S	3636	$57.01	Disposed	110972	Direct
2012-05-29	Common Stock	S	1964	$57.02	Disposed	109008	Direct
2012-05-29	Common Stock	S	4700	$57.03	Disposed	104308	Direct
2012-05-29	Common Stock	S	100	$57.0301	Disposed	104208	Direct
2012-05-29	Common Stock	S	600	$57.04	Disposed	103608	Direct
2012-05-29	Common Stock	S	1829	$57.05	Disposed	101779	Direct
2012-05-29	Common Stock	S	1300	$57.07	Disposed	100479	Direct
2012-05-29	Common Stock	S	1100	$57.08	Disposed	99379	Direct
2012-05-29	Common Stock	S	100	$57.0801	Disposed	99279	Direct
2012-05-29	Common Stock	S	2800	$57.10	Disposed	96479	Direct
2012-05-29	Common Stock	S	800	$57.11	Disposed	95679	Direct
2012-05-29	Common Stock	S	1271	$57.15	Disposed	94408	Direct
2012-05-29	Common Stock	S	500	$57.16	Disposed	93908	Direct
2012-05-29	Common Stock	S	1500	$57.17	Disposed	92408	Direct
2012-05-29	Common Stock	S	200	$57.1701	Disposed	92208	Direct
2012-05-29	Common Stock	S	200	$57.18	Disposed	92008	Direct
2012-05-29	Common Stock	S	100	$57.185	Disposed	91908	Direct
2012-05-29	Common Stock	S	100	$57.19	Disposed	91808	Direct
2012-05-29	Common Stock	S	200	$57.21	Disposed	91608	Direct
2012-05-29	Common Stock	S	200	$57.23	Disposed	91408	Direct
2012-05-29	Common Stock	S	500	$57.27	Disposed	90908	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20000	Indirect
Common Stock	120875	Indirect
Common Stock	46005277	Indirect

Footnotes

F1: 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.

F2: 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.