WESTLAKE CORP — Director's Dealing 2012

Aug 8, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-08-06

Reporting Person: Mangieri George J (VP & Chief Accounting Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-06	Common Stock	M	5128	$14.235	Acquired	26851	Direct
2012-08-06	Common Stock	M	2308	$20.525	Acquired	29159	Direct
2012-08-06	Common Stock	M	1779	$27.22	Acquired	30938	Direct
2012-08-06	Common Stock	M	15357	$31.61	Acquired	46295	Direct
2012-08-06	Common Stock	M	2595	$31.61	Acquired	48890	Direct
2012-08-06	Common Stock	S	16215	$67.15	Disposed	32675	Direct
2012-08-06	Common Stock	S	1420	$68.00	Disposed	31255	Direct
2012-08-06	Common Stock	S	400	$68.04	Disposed	30855	Direct
2012-08-06	Common Stock	S	14361	$68.05	Disposed	16494	Direct
2012-08-06	Common Stock	S	400	$68.06	Disposed	16094	Direct
2012-08-06	Common Stock	S	400	$68.09	Disposed	15694	Direct
2012-08-06	Common Stock	S	200	$68.10	Disposed	15494	Direct
2012-08-06	Common Stock	S	400	$68.17	Disposed	15094	Direct
2012-08-06	Common Stock	S	200	$68.18	Disposed	14894	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-06	Employee Option (right to buy)	$14.235	M	5128	Acquired	2019-02-13	Common Stock (5128)	Direct
2012-08-06	Employee Option (right to buy)	$20.525	M	2308	Acquired	2020-02-26	Common Stock (2308)	Direct
2012-08-06	Employee Option (right to buy)	$27.22	M	1779	Acquired	2015-08-31	Common Stock (1779)	Direct
2012-08-06	Employee Option (right to buy)	$31.61	M	15357	Acquired	2017-02-23	Common Stock (15357)	Direct
2012-08-06	Employee Option (right to buy)	$31.61	M	2595	Acquired	2017-02-23	Common Stock (2595)	Direct