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: Taylor Jeffrey L (Sr VP, Polyethylene)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-29	Common Stock	M	7678	$31.61	Acquired	27725	Direct
2012-05-29	Common Stock	S	600	$56.8201	Disposed	27125	Direct
2012-05-29	Common Stock	S	200	$56.8	Disposed	26925	Direct
2012-05-29	Common Stock	S	1100	$56.79	Disposed	25825	Direct
2012-05-29	Common Stock	S	1700	$56.765	Disposed	24125	Direct
2012-05-29	Common Stock	S	2096	$56.76	Disposed	22029	Direct
2012-05-29	Common Stock	S	300	$56.75	Disposed	21729	Direct
2012-05-29	Common Stock	S	466	$57.74	Disposed	21263	Direct
2012-05-29	Common Stock	S	400	$56.73	Disposed	20863	Direct
2012-05-29	Common Stock	S	600	$56.72	Disposed	20263	Direct
2012-05-29	Common Stock	S	216	$56.71	Disposed	20047	Direct
2012-05-29	Common Stock	S	501	$56.7601	Disposed	19546	Direct
2012-05-29	Common Stock	S	300	$56.75	Disposed	19246	Direct
2012-05-29	Common Stock	S	200	$56.74	Disposed	19046	Direct
2012-05-29	Common Stock	S	400	$56.72	Disposed	18646	Direct
2012-05-29	Common Stock	S	700	$56.7	Disposed	17946	Direct
2012-05-29	Common Stock	S	800	$56.69	Disposed	17146	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-29	Employee Option (right to buy)	$31.61	M	7678	Acquired	2017-02-23	Common Stock (7678)	Direct