WESTLAKE CORP — Director's Dealing 2013

Mar 18, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-03-14

Reporting Person: Hansen David R (Sr VP Adminstration)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-14	Common Stock	M	2979	$20.525	Acquired	18031	Direct
2013-03-14	Common Stock	M	1618	$14.235	Acquired	19649	Direct
2013-03-14	Common Stock	S	2000	$96.36	Disposed	17649	Direct
2013-03-14	Common Stock	S	300	$96.361	Disposed	17349	Direct
2013-03-14	Common Stock	S	100	$96.37	Disposed	17249	Direct
2013-03-14	Common Stock	S	196	$96.371	Disposed	17053	Direct
2013-03-14	Common Stock	S	200	$96.38	Disposed	16853	Direct
2013-03-14	Common Stock	S	200	$96.431	Disposed	16653	Direct
2013-03-14	Common Stock	S	100	$96.48	Disposed	16553	Direct
2013-03-14	Common Stock	S	300	$96.481	Disposed	16253	Direct
2013-03-14	Common Stock	S	100	$96.53	Disposed	16153	Direct
2013-03-14	Common Stock	S	400	$96.531	Disposed	15753	Direct
2013-03-14	Common Stock	S	1	$96.641	Disposed	15752	Direct
2013-03-14	Common Stock	S	400	$96.642	Disposed	15352	Direct
2013-03-14	Common Stock	S	200	$96.65	Disposed	15152	Direct
2013-03-14	Common Stock	S	100	$96.66	Disposed	15052	Direct
2013-03-14	Common Stock	S	1000	$96.50	Disposed	14052	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-14	Employee Option (right to buy)	$20.525	M	2979	Disposed	2020-02-26	Common Stock (2979)	Direct
2013-03-14	Employee Option (right to buy)	$14.235	M	1618	Disposed	2019-02-13	Common Stock (1618)	Direct