WESTLAKE CORP — Director's Dealing 2010

Nov 22, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2010-11-18

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-18	Common Stock	M	9934	$27.22	Acquired	97871	Direct
2010-11-18	Common Stock	M	6977	$36.1	Acquired	104848	Direct
2010-11-18	Common Stock	M	15488	$31.61	Acquired	120336	Direct
2010-11-18	Common Stock	S	32399	$37.5	Disposed	87937	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-11-18	Employee Option (right to buy)	$27.22	M	9934	Acquired	2015-08-31	Common Stock (9934)	Direct
2010-11-18	Employee Option (right to buy)	$36.10	M	6977	Acquired	2016-03-15	Common Stock (6977)	Direct
2010-11-18	Employee Option (right to buy)	$31.61	M	15488	Acquired	2017-02-13	Common Stock (15488)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20000	Indirect
Common Stock	125378	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Employee Option (right to buy)	$27.22	2015-03-31	Common Stock (0)	13547	Indirect
Employee Option (right to buy)	$36.1	2016-03-15	Common Stock (0)	9514	Indirect
Employee Option (right to buy)	$31.61	2017-02-23	Common Stock (0)	21090	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.