WESTLAKE CORP — Director's Dealing 2010

Apr 7, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2010-04-05

Reporting Person: Buesinger Robert F. (Sr. Vice President, Vinyls)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-04-05	Common Stock	A	1836	—	Acquired	1836	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-04-05	Employee Option (right to buy)	$27.235	A	4433	Acquired	2020-04-05	Common Stock (4433)	Direct

Footnotes

F1: The shares of restricted stock will vest in three equal installments on April 5, 2011, 2012 and 2013.

F2: The stock options are exercisable in three equal installments on April 5, 2011, 2012 and 2013.