WESTLAKE CORP — Director's Dealing 2016

Feb 18, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CHEMICAL CORP (WLK)
CIK: 0001262823
Period of Report: 2016-02-15

Reporting Person: Chao Albert (Director, President & CEO, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-02-15	Common Stock	M	14246	—	Acquired	268633	Direct
2016-02-17	Common Stock	F	3931	$43.52	Disposed	264702	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-02-15	Restricted Stock Units	$	M	14246	Disposed		Common Stock (14246)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	40000	Indirect
Common Stock	111532	Indirect
Common Stock	92010554	Indirect

Footnotes

F1: Restricted stock units convert into Issuer's common stock on a one-for-one basis.

F2: On February 15, 2013, the reporting person was granted 14,246 restricted stock units vesting on the third anniversary of the grant date.

F3: The person reporting 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.

F4: 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.