WESTLAKE CORP — Director's Dealing 2011

Mar 16, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2011-03-15

Reporting Person: Chao James (Director, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-15	Common Stock	M	49007	$19.29	Acquired	145614	Direct
2011-03-15	Common Stock	S	49007	$50.20	Disposed	96607	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-15	Employee Option (right to buy)	$19.29	M	49007	Acquired	2018-02-15	Common Stock (49009)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20000	Indirect
Common Stock	129271	Indirect
Common Stock	46005277	Indirect

Footnotes

F1: The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F2: Even though reporting person and reporting person's brother, Albert Chao, share a household, the reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.