WESTLAKE CORP — Director's Dealing 2021

Mar 9, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2021-03-08

Reporting Person: Buesinger Robert F. (EVP, Vinyl Products)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-03-08	Common Stock	M	8652	$61.865	Acquired	21951	Direct
2021-03-08	Common Stock	M	7861	$65.8125	Acquired	29812	Direct
2021-03-08	Common Stock	S	8652	$92.50	Disposed	21160	Direct
2021-03-08	Common Stock	S	7861	$95.00	Disposed	13299	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-03-08	Employee Option (right to buy)	$61.865	M	8652	Disposed	2027-02-17	Common Stock (8652)	Direct
2021-03-08	Employee Option (right to buy)	$65.8125	M	7861	Disposed	2030-02-14	Common Stock (7861)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $92.50 to $92.52, 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 17, 2018, 2019 and 2020.

F3: The stock options are excercisable in three installments of 33%, 33% and 34% on February 14, 2021, 2022 and 2023.