WESTLAKE CORP — Director's Dealing 2010

Mar 15, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2010-03-15

Reporting Person: Morse Wayne D (Sr VP, Vinyls)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-11	Common Stock	M	3822	$19.29	Acquired	29831	Direct
2010-03-11	Common Stock	M	1623	$14.235	Acquired	31454	Direct
2010-03-11	Common Stock	S	5445	$22.50	Disposed	26009	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-03-11	Employee Option (right to buy)	$19.29	M	3822	Disposed	2018-02-15	Common Stock (3822)	Direct
2010-03-11	Employee Option (right to buy)	$14.235	M	1623	Disposed	2019-02-13	Common Stock (1623)	Direct

Footnotes

F1: The stock options became or will become exercisable in three equal installments on February 15, 2009, 2010 and 2011.

F2: The stock options became or will become exercisable in three equal installments on February 13, 2010, 2011 and 2012.