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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Buesinger Robert F.   2. Issuer Name and Ticker or Trading Symbol WESTLAKE CHEMICAL CORP [WLK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP, Vinyl Products (Last) (First) (Middle) 2801 POST OAK BOULEVARD, SUITE 600 3. Date of Earliest Transaction (Month/Day/Year) 03/05/2018 (Street) HOUSTON, TX 77056 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 03/05/2018   M   6,608 A $ 68.09 14,731 D   Common Stock 03/05/2018   M   4,446 A $ 44.42 19,177 D   Common Stock 03/05/2018   M   4,261 A $ 61.865 23,438 D   Common Stock 03/05/2018   S   15,315 D $ 113.05 (4) 8,123 D   Common Stock 03/05/2018   S   4,034 D $ 113 4,089 D

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Employee Option (right to buy)

$ 68.09

03/05/2018

M

6,608

(1)

02/20/2025

Common Stock

6,608

$ 0

0

D

Employee Option (right to buy)

$ 44.42

03/05/2018

M

4,446

(2)

02/18/2026

Common Stock

4,446

$ 0

4,581

D

Employee Option (right to buy)

$ 61.865

03/05/2018

M

4,261

(3)

02/17/2027

Common Stock

4,261

$ 0

8,652

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Buesinger Robert F. 2801 POST OAK BOULEVARD, SUITE 600 HOUSTON, TX 77056			EVP, Vinyl Products

Signatures

Robert F. Buesinger by J. Feng POA		03/06/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2016, 2017 and 2018, respectively.
(2)	The stock options are excercisable in three installments of 33%, 33% and 34% on February 18, 2017, 2018 and 2019, respectively.
(3)	The stock options are excercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively.
(4)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $113.00 to $113.10, 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.

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