WESTLAKE CORP — Director's Dealing 2012

Dec 11, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2012-12-07

Reporting Person: Chao James (Director, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-07	Common Stock	M	30193	$20.525	Acquired	146035	Direct
2012-12-07	Common Stock	S	8696	$75.23	Disposed	137339	Direct
2012-12-07	Common Stock	S	5077	$75.25	Disposed	132262	Direct
2012-12-07	Common Stock	S	1600	$72.26	Disposed	130662	Direct
2012-12-07	Common Stock	S	300	$75.27	Disposed	130362	Direct
2012-12-07	Common Stock	S	1200	$75.3	Disposed	129162	Direct
2012-12-07	Common Stock	S	1300	$75.31	Disposed	127862	Direct
2012-12-07	Common Stock	S	500	$75.33	Disposed	127362	Direct
2012-12-07	Common Stock	S	2200	$75.34	Disposed	125162	Direct
2012-12-07	Common Stock	S	5220	$75.35	Disposed	119942	Direct
2012-12-07	Common Stock	S	400	$75.39	Disposed	119542	Direct
2012-12-07	Common Stock	S	100	$75.4	Disposed	119442	Direct
2012-12-07	Common Stock	S	200	$75.43	Disposed	119242	Direct
2012-12-07	Common Stock	S	200	$75.44	Disposed	119042	Direct
2012-12-07	Common Stock	S	300	$75.48	Disposed	118742	Direct
2012-12-07	Common Stock	S	200	$75.495	Disposed	118542	Direct
2012-12-07	Common Stock	S	200	$75.5	Disposed	118342	Direct
2012-12-07	Common Stock	S	400	$75.51	Disposed	117942	Direct
2012-12-07	Common Stock	S	200	$75.53	Disposed	117742	Direct
2012-12-07	Common Stock	S	100	$75.55	Disposed	117642	Direct
2012-12-07	Common Stock	S	200	$75.58	Disposed	117442	Direct
2012-12-07	Common Stock	S	100	$75.59	Disposed	117342	Direct
2012-12-07	Common Stock	S	300	$75.65	Disposed	117042	Direct
2012-12-07	Common Stock	S	100	$75.66	Disposed	116942	Direct
2012-12-07	Common Stock	S	100	$75.67	Disposed	116842	Direct
2012-12-07	Common Stock	S	100	$75.68	Disposed	116742	Direct
2012-12-07	Common Stock	S	900	$75.71	Disposed	115842	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-12-07	Employee Option (right to buy)	$20.525	M	30193	Acquired	2020-02-26	Common Stock (30193)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20000	Indirect
Common Stock	150040	Indirect
Common Stock	46005277	Indirect

Footnotes

F1: The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F2: The stock options, representing the right to purchase a total of 47,390 shares, became (or will become) exercisable in three equal
installments on February 26, 2011, 2012, and 2013.