WESTLAKE CORP — Director's Dealing 2013

Mar 13, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-03-11

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-11	Common Stock	M	1439	$60.105	Acquired	5784	Direct
2013-03-11	Common Stock	M	922	$45.83	Acquired	6706	Direct
2013-03-11	Common Stock	S	600	$93.76	Disposed	6106	Direct
2013-03-11	Common Stock	S	100	$93.77	Disposed	6006	Direct
2013-03-11	Common Stock	S	100	$93.78	Disposed	5906	Direct
2013-03-11	Common Stock	S	461	$93.79	Disposed	5445	Direct
2013-03-11	Common Stock	S	600	$93.8	Disposed	4845	Direct
2013-03-11	Common Stock	S	200	$93.81	Disposed	4645	Direct
2013-03-11	Common Stock	S	100	$93.8103	Disposed	4545	Direct
2013-03-11	Common Stock	S	100	$93.815	Disposed	4445	Direct
2013-03-11	Common Stock	S	100	$93.8168	Disposed	4345	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-11	Employee Option (right to buy)	$60.105	M	1439	Disposed	2022-02-17	Common Stock (1439)	Direct
2013-03-11	Employee Option (right to buy)	$45.83	M	922	Disposed	2021-02-18	Common Stock (922)	Direct