WESTLAKE CORP — Director's Dealing 2011

Mar 4, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2011-03-02

Reporting Person: Hansen David R (Sr VP Administration)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-02	Common Stock	M	6618	$14.235	Acquired	34297	Direct
2011-03-02	Common Stock	M	3031	$19.29	Acquired	37328	Direct
2011-03-02	Common Stock	M	2978	$20.525	Acquired	40306	Direct
2011-03-02	Common Stock	S	12627	$48.00	Disposed	27679	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-02	Employee Option (right to buy)	$14.235	M	6618	Acquired	2019-02-13	Common Stock (6618)	Direct
2011-03-02	Employee Option (right to buy)	$19.29	M	3031	Acquired	2018-02-15	Common Stock (3031)	Direct
2011-03-02	Employee Option (right to buy)	$20.525	M	2978	Acquired	2020-02-26	Common Stock (2978)	Direct