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WESTLAKE CORP Director's Dealing 2013

May 10, 2013

30551_dirs_2013-05-10_d0ab09d9-29cb-420d-b030-5ad52a5b5ecd.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-05-08

Reporting Person: Wallace Stephen (VP, General Counsel, Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-08	Common Stock	M	2594	$27.22	Acquired	27757	Direct
2013-05-08	Common Stock	M	7678	$31.61	Acquired	35435	Direct
2013-05-08	Common Stock	M	3585	$31.61	Acquired	39020	Direct
2013-05-08	Common Stock	S	13857	$89.80	Disposed	25163	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-08	Employee Option (right to buy)	$27.22	M	2594	Disposed	2015-08-31	Common Stock (2594)	Direct
2013-05-08	Employee Option (right to buy)	$31.61	M	7678	Disposed	2017-02-23	Common Stock (7678)	Direct
2013-05-08	Employee Option (right to buy)	$31.61	M	3585	Disposed	2017-02-23	Common Stock (3585)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	200	Indirect