WESTLAKE CORP — Director's Dealing 2015

May 12, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2015-05-11

Reporting Person: Teel Lawrence E. (SVP, Olefins)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-11	Common Stock	M	686	$45.6975	Acquired	1580	Direct
2015-05-11	Common Stock	M	898	$30.0525	Acquired	2478	Direct
2015-05-11	Common Stock	S	1584	$70.253	Disposed	894	Direct
2015-05-11	Common Stock	S	541	$70.233	Disposed	353	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-11	Employee Option (right to buy)	$45.6975	M	686	Disposed	2023-02-15	Common Stock (686)	Direct
2015-05-11	Employee Option (right to buy)	$30.0525	M	898	Disposed	2022-02-17	Common Stock (898)	Direct

Footnotes

F1: The stock options are exercisable in three installments of 33%, 33% and 34% on February 15, 2014, 2015 and 2016, respectively.

F2: The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2013, 2014 and 2015, respectively.