WESTLAKE CORP — Director's Dealing 2017

Dec 5, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2017-12-04

Reporting Person: Bender Mark Steven (EVP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-12-04	Common Stock	M	6500	$22.915	Acquired	30567	Direct
2017-12-04	Common Stock	S	6500	$97.831	Disposed	24067	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-12-04	Employee Option (right to buy)	$22.915	M	6500	Acquired	2021-02-18	Common Stock (6500)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $97.35 to $98.17, 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.

F2: The stock options are excercisable in three installments of 33%, 33% and 34% on February 18, 2012, 2013 and 2014.