WESTLAKE CORP — Director's Dealing 2011

Mar 10, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2011-03-09

Reporting Person: Wallace Stephen (VP, General Counsel, Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-09	Common Stock	M	1388	$36.10	Acquired	29219	Direct
2011-03-09	Common Stock	S	1388	$50.09	Disposed	27831	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-09	Employee Option (right to buy)	$36.10	M	1388	Acquired	2016-03-15	Common Stock (1388)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	200	Indirect