WESTLAKE CORP — Director's Dealing 2012

May 16, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-05-14

Reporting Person: Taylor Jeffrey L (Sr VP, Polyethylene)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-14	Common Stock	M	6028	$14.235	Acquired	26075	Direct
2012-05-14	Common Stock	S	1753	$56.5418	Disposed	24322	Direct
2012-05-14	Common Stock	S	400	$56.5798	Disposed	23922	Direct
2012-05-14	Common Stock	S	100	$56.58	Disposed	23822	Direct
2012-05-14	Common Stock	S	300	$56.586	Disposed	23522	Direct
2012-05-14	Common Stock	S	140	$56.59	Disposed	23382	Direct
2012-05-14	Common Stock	S	205	$56.5922	Disposed	23177	Direct
2012-05-14	Common Stock	S	600	$56.6	Disposed	22577	Direct
2012-05-14	Common Stock	S	200	$56.61	Disposed	22377	Direct
2012-05-14	Common Stock	S	200	$56.6103	Disposed	22177	Direct
2012-05-14	Common Stock	S	400	$56.62	Disposed	21777	Direct
2012-05-14	Common Stock	S	500	$56.63	Disposed	21277	Direct
2012-05-14	Common Stock	S	5	$56.64	Disposed	21272	Direct
2012-05-14	Common Stock	S	22	$56.65	Disposed	21250	Direct
2012-05-14	Common Stock	S	800	$56.6501	Disposed	20450	Direct
2012-05-14	Common Stock	S	303	$56.67	Disposed	20147	Direct
2012-05-14	Common Stock	S	100	$56.69	Disposed	20047	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-14	Employee Option (right to buy)	$14.235	M	6028	Acquired	2019-02-13	Common Stock (6028)	Direct