WESTLAKE CORP — Director's Dealing 2013

Feb 20, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-02-15

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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-02-15	Employee Option (right to buy)	$91.395	A	2810	Acquired	2023-02-15	Common Stock (2810)	Direct
2013-02-15	Restricted Stock Units	$	A	1057	Acquired		Common Stock (1057)	Direct

Footnotes

F1: The stock options are exercisable in installments of 33%, 33%, and 34% on February 15, 2014, 2015 and 2016, respectively.

F2: Each restricted stock unit represents a contingent right to receive one share of Westlake Chemical Corporation common stock.

F3: The restricted stock units will vest three years from the date of grant (February 15, 2016).