WESTLAKE CORP — Director's Dealing 2014

Mar 3, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2014-02-28

Reporting Person: RILEY H JOHN JR (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-02-28	Common Stock	M	3549	$24.51	Acquired	12355	Direct
2014-02-28	Common Stock	M	3826	$20.825	Acquired	16181	Direct
2014-02-28	Common Stock	S	7375	$134.7047	Disposed	8806	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-02-28	Employee Option (right to buy)	$24.51	M	3549	Disposed	2019-08-20	Common Stock (3549)	Direct
2014-02-28	Employee Option (right to buy)	$20.825	M	3826	Disposed	2018-08-25	Common Stock (3826)	Direct

Footnotes

F1: The stock options are exercisable in three installments of 33%, 33% and 34% on August 20, 2010, 2011 and 2012, respectively.

F2: The stock options are exercisable in three installments of 33%, 33% and 34% on August 15, 2009, 2010 and 2011, respectively.

F3: In accordance with the Securities and Exchange Commission's No Action Letter dated June 25, 2008, we have aggregated the sales that occurred on February 28, 2014 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $134.678 to $134.84, inclusive. The reporting person undertakes to provide to Westlake Chemical Corporation, any security holder of Westlake Chemical Corporation 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 (3) to this Form 4.