WESTLAKE CORP — Director's Dealing 2017

Nov 15, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2017-11-13

Reporting Person: Bender Mark Steven (EVP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-11-13	Common Stock	M	29804	$10.2625	Acquired	74253	Direct
2017-11-13	Common Stock	S	29204	$94.005	Disposed	45049	Direct
2017-11-13	Common Stock	S	600	$94.60	Disposed	44449	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-11-13	Employee Option (right to buy)	$10.2625	M	29804	Disposed	2020-02-26	Common Stock (29804)	Direct

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 November 13, 2017 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $93.50 to $94.50, 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 stock options are exercisable in three installments of 33%, 33% and 34% on February 26, 2011, 2012 and 2013.