WESTLAKE CORP — Director's Dealing 2013

Mar 26, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-03-25

Reporting Person: Bender Mark Steven (Sr VP, CFO and Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-25	Common Stock	M	235	$27.22	Acquired	28850	Direct
2013-03-25	Common Stock	M	922	$36.1	Acquired	29772	Direct
2013-03-25	Common Stock	M	3272	$25.42	Acquired	33044	Direct
2013-03-25	Common Stock	S	4429	$95.00	Disposed	28615	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-25	Employee Option (right to buy)	$27.22	M	235	Disposed	2015-08-31	Common Stock (235)	Direct
2013-03-25	Employee Option (right to buy)	$36.1	M	922	Disposed	2016-03-15	Common Stock (922)	Direct
2013-03-25	Employee Option (right to buy)	$25.42	M	3272	Disposed	2015-06-15	Common Stock (3272)	Direct