WESTLAKE CORP — Director's Dealing 2012

Dec 12, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-12-10

Reporting Person: Buesinger Robert F. (Sr. Vice President, Vinyls)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-10	Common Stock	M	922	$45.83	Acquired	5267	Direct
2012-12-10	Common Stock	S	922	$75.6815	Disposed	4345	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-10	Employee Option (right to buy)	$45.83	M	922	Acquired	2021-02-18	Common Stock (922)	Direct

Footnotes

F1: The stock options, representing the right to purchase a total of 2,766 shares, became (or will become) exercisable in three equal installments on February 18, 2012, 2013 and 2014.