Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Mattina Michael J.
2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2015
3. Issuer Name and Ticker or Trading Symbol
WESTLAKE CHEMICAL CORP [WLK]
(Last)
(First)
(Middle)
2801 POST OAK BLVD
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr. VP, Polyethylene
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

HOUSTON, TX 77056
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 7,910
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units   (2)   (2) Common Stock 892 $ (1) D  
Restricted Stock Units   (3)   (3) Common Stock 660 $ (1) D  
Restricted Stock Units   (4)   (4) Common Stock 644 $ (1) D  
Employee Option (Right to Buy)   (5) 02/17/2022 Common Stock 1,334 $ 30.0525 D  
Employee Option (Right to Buy)   (6) 02/15/2023 Common Stock 1,582 $ 45.6975 D  
Employee Option (Right to Buy)   (7) 02/14/2024 Common Stock 2,054 $ 63.9775 D  
Employee Option (Right to Buy)   (8) 02/20/2025 Common Stock 2,148 $ 68.09 D  
Employee Option (Right to Buy)   (9) 02/23/2017 Common Stock 15,358 $ 15.805 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Mattina Michael J.
2801 POST OAK BLVD
HOUSTON, TX 77056
      Sr. VP, Polyethylene  

Signatures

Michael J. Mattina by J. Iglesias POA 04/13/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Each restricted stock unit represents a contingent right to receive one share of Westlake Chemical Corporation common stock.
(2) The restricted stock units will vest three years from the date of grant (February 15, 2016).
(3) The restricted stock units will vest three years from the date of grant (February 14, 2017).
(4) The restricted stock units will vest three years from the date of grant (February 20, 2018).
(5) The stock options are exercisable in three installments of 33%, 33%, and 34% on February 17, 2013, 2014 and 2015, respectively.
(6) The stock options are exercisable in three installments of 33%, 33%, and 34% on February 15, 2014, 2015 and 2016, respectively.
(7) The stock options are exercisable in three installments of 33%, 33%, and 34% on February 14, 2015, 2016 and 2017, respectively.
(8) The stock options are exercisable in three installments of 33%, 33%, and 34% on February 20, 2016, 2017 and 2018, respectively.
(9) The stock options are exercisable in two equal installments on February 23, 2012 and August 23, 2016.

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