WESTLAKE CORP — Director's Dealing 2011

Aug 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2011-05-19

Reporting Person: Buesinger Robert F. (Sr. Vice President, Vinyls)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-19	Common Stock	M	1477	$27.2350	Acquired	4081	Direct
2011-05-19	Common Stock	S	100	$55.43	Disposed	3981	Direct
2011-05-19	Common Stock	S	100	$55.42	Disposed	3881	Direct
2011-05-19	Common Stock	S	600	$55.40	Disposed	3281	Direct
2011-05-19	Common Stock	S	677	$55.39	Disposed	2604	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-19	Employee Option(right to buy)	$27.235	A	1477	Acquired	2020-04-05	Common Stock (1477)	Direct