WESTLAKE CORP — Director's Dealing 2012

May 14, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-05-10

Reporting Person: LUKENS MAX L (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-10	Common Stock	M	480	$27.125	Acquired	10509	Direct
2012-05-10	Common Stock	M	957	$20.825	Acquired	11466	Direct
2012-05-10	Common Stock	M	887	$24.51	Acquired	12353	Direct
2012-05-10	Common Stock	S	5765	$57.35	Disposed	6588	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-10	Common Stock	$27.125	M	480	Acquired	2017-08-17	Common Stock (480)	Direct
2008-08-15	Common Stock	$20.825	M	957	Acquired	2018-08-15	Common Stock (957)	Direct
2012-05-10	Common Stock	$24.51	M	887	Acquired	2019-08-20	Common Stock (887)	Direct