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: Condon Donald Marion Jr (Sr VP, Olefins & Corp Bus Dev)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-29	Common Stock	M	5519	$14.235	Acquired	26639	Direct
2012-05-29	Common Stock	M	5381	$20.525	Acquired	32020	Direct
2012-05-29	Common Stock	M	7678	$31.61	Acquired	39698	Direct
2012-05-29	Common Stock	S	10504	$57.23	Disposed	29194	Direct
2012-05-29	Common Stock	S	2900	$57.2318	Disposed	26294	Direct
2012-05-29	Common Stock	S	2003	$57.24	Disposed	24291	Direct
2012-05-29	Common Stock	S	771	$57.25	Disposed	23520	Direct
2012-05-29	Common Stock	S	600	$57.26	Disposed	22920	Direct
2012-05-29	Common Stock	S	300	$57.27	Disposed	22620	Direct
2012-05-29	Common Stock	S	400	$57.28	Disposed	22220	Direct
2012-05-29	Common Stock	S	400	$57.3	Disposed	21820	Direct
2012-05-29	Common Stock	S	200	$57.32	Disposed	21620	Direct
2012-05-29	Common Stock	S	100	$57.3203	Disposed	21520	Direct
2012-05-29	Common Stock	S	100	$57.322	Disposed	21420	Direct
2012-05-29	Common Stock	S	200	$57.3233	Disposed	21220	Direct
2012-05-29	Common Stock	S	100	$57.3275	Disposed	21120	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
2012-05-29	Employee Option (right to buy)	$14.235	M	5519	Acquired	2019-02-13	Common Stock (5519)	Direct
2012-05-29	Employee Option (right to buy)	$20.525	M	5381	Acquired	2020-02-26	Common Stock (5781)	Direct