WESTLAKE CORP — Director's Dealing 2014

Aug 25, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2014-08-22

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-08-22	Common Stock	M	10785	$22.915	Acquired	110911	Direct
2014-08-22	Common Stock	M	31594	$10.2625	Acquired	142505	Direct
2014-08-22	Common Stock	S	42379	$93.5737	Disposed	100126	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-08-22	Employee Option (right to buy)	$22.915	M	10785	Disposed	2022-02-18	Common Stock (10785)	Direct
2014-08-22	Employee Option (right to buy)	$10.2625	M	31594	Disposed	2021-02-26	Common Stock (31594)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	40000	Indirect
Common Stock	92010554	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 22, 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 $93.31 to $93.74, 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.

F2: 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.

F3: 92,010,554 shares are held through TTWF LP, a Delaware limited partnership. Two trusts for the benefit of members of the Chao family, including the reporting person, are the managers of TTWFGP LLC, a Delaware limited liability company that is the general partner of TTWF LP. The limited partners of TTWF LP are five trusts, principally for the benefit of members of the Chao family, including the reporting person, and two corporations owned, indirectly or directly, by certain of these trusts and by other entities owned by members of the Chao family, including the reporting person. The reporting person shares investment and voting power with respect to the shares beneficially owned by TTWF LP. The reporting person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein.

F4: Values and amounts reflect the results of a two-for-one stock split on March 18, 2014.

F5: The stock options are exercisable in three installments of 33%, 33% and 34% on February 18, 2012, 2013 and 2014, respectively.

F6: The stock options are exercisable in three installments of 33%, 33% and 34% on February 26, 2011, 2012 and 2013, respectively.