Sec Form 4 Filing - Jenkins Dorothy C @ WESTLAKE CHEMICAL CORP - 2019-08-16

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Jenkins Dorothy C 2. Issuer Name and Ticker or Trading Symbol WESTLAKE CHEMICAL CORP [ WLK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2801 POST OAK BOULEVARD, SUITE 600 3. Date of Earliest Transaction (MM/DD/YY) 08/16/2019 (Street) HOUSTON, TX77056 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 08/17/2019 M 1,003 A 59,111 D Common Stock 08/17/2019 M 1,409 A 60,520 D Common Stock 92,010,554 I TTWF LP & TTWF GP LLC ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 1 ) 08/16/2019 A 2,387 ( 2 ) ( 2 ) Common Stock 2,387 $ 0 2,387 D Restricted Stock Units ( 1 ) 08/17/2019 M 1,003 ( 3 ) ( 3 ) Common Stock 1,003 $ 0 0 D Restricted Stock Units ( 1 ) 08/17/2019 M 1,409 ( 4 ) ( 4 ) Common Stock 1,409 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Jenkins Dorothy C 2801 POST OAK BOULEVARD, SUITE 600 HOUSTON, TX77056 X X Signatures Dorothy C. Jenkins by J Feng POA 08/19/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Restricted stock units convert into the Issuer's common stock on a one-for-one basis. ( 2 )All of the restricted stock units will vest on August 16, 2020. ( 3 )On August 17, 2016 the reporting person was granted 3,009 restricted stock units vesting in three equal installments beginning on the first anniversary of the grant date. ( 4 )On August 17, 2018 the reporting person was granted 1,409 restricted stock units vesting on the first anniversary of the grant date. ( 5 )92,010,554 shares of Issuer 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 her pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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