WESTLAKE CORP — Director's Dealing 2010

Mar 5, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2010-03-03

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-03	Common Stock	M	6028	$14.235	Acquired	29739	Direct
2010-03-03	Common Stock	S	2000	$23.	Disposed	27739	Direct
2010-03-03	Common Stock	S	200	$22.99	Disposed	27539	Direct
2010-03-03	Common Stock	S	600	$22.97	Disposed	26939	Direct
2010-03-03	Common Stock	S	1200	$22.95	Disposed	25739	Direct
2010-03-03	Common Stock	S	600	$22.94	Disposed	25139	Direct
2010-03-03	Common Stock	S	300	$22.93	Disposed	24839	Direct
2010-03-03	Common Stock	S	500	$22.92	Disposed	24339	Direct
2010-03-03	Common Stock	S	628	$22.91	Disposed	23711	Direct
2010-03-03	Common Stock	S	981	$22.9625	Disposed	22730	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-03-03	Employee Option (right to buy)	$14.235	M	6028	Disposed	2019-02-13	Common Stock (6028)	Direct

Footnotes

F1: The stock options became or will become exercisable in three equal installments on February 13, 2010, 2011 and 2012.