WESTLAKE CORP — Director's Dealing 2013

Aug 5, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2013-08-01

Reporting Person: LUKENS MAX L (VP, General Counsel, Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-08-01	Common Stock	M	8935	$20.525	Acquired	34098	Direct
2013-08-01	Common Stock	M	1261	$60.105	Acquired	35359	Direct
2013-08-01	Common Stock	M	2590	$45.83	Acquired	37949	Direct
2013-08-01	Common Stock	S	12786	$105.7149	Disposed	25163	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-08-01	Employee Option (right to buy)	$20.525	M	8935	Disposed	2020-02-26	Common Stock (8935)	Direct
2013-08-01	Employee Option (right to buy)	$60.105	M	1261	Disposed	2022-02-17	Common Stock (1261)	Direct
2013-08-01	Employee Option (right to buy)	$45.83	M	2590	Disposed	2021-02-18	Common Stock (2590)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	200	Indirect

Footnotes

F1: In accordance with the Securities and Exchange Commission's No Action Letter dated June 25, 2008, we have aggregated the sales that occurred on August 1, 2013 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $105.6000 to $105.9050, inclusive. The reporting person undertakes to provide to Westlake Chemical Corp., any security holder of Westlake Chemical Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4.