Sec Form 4 Filing - Chao James @ WESTLAKE CHEMICAL CORP - 2012-05-29

Insider filing report for Changes in Beneficial Ownership
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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
Chao James
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
X __ Officer (give title below) X __ Other (specify below)
Chairman/10% Owner
(Last) (First) (Middle)
2801 POST OAK BLVD.
3. Date of Earliest Transaction (MM/DD/YY)
05/29/2012
(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 05/29/2012 S 434 D $ 56.98 115,408 D
Common Stock 05/29/2012 S 300 D $ 56.99 115,108 D
Common Stock 05/29/2012 S 500 D $ 57 114,608 D
Common Stock 05/29/2012 S 3,636 D $ 57.01 110,972 D
Common Stock 05/29/2012 S 1,964 D $ 57.02 109,008 D
Common Stock 05/29/2012 S 4,700 D $ 57.03 104,308 D
Common Stock 05/29/2012 S 100 D $ 57.0301 104,208 D
Common Stock 05/29/2012 S 600 D $ 57.04 103,608 D
Common Stock 05/29/2012 S 1,829 D $ 57.05 101,779 D
Common Stock 05/29/2012 S 1,300 D $ 57.07 100,479 D
Common Stock 05/29/2012 S 1,100 D $ 57.08 99,379 D
Common Stock 05/29/2012 S 100 D $ 57.0801 99,279 D
Common Stock 05/29/2012 S 2,800 D $ 57.1 96,479 D
Common Stock 05/29/2012 S 800 D $ 57.11 95,679 D
Common Stock 05/29/2012 S 1,271 D $ 57.15 94,408 D
Common Stock 05/29/2012 S 500 D $ 57.16 93,908 D
Common Stock 05/29/2012 S 1,500 D $ 57.17 92,408 D
Common Stock 05/29/2012 S 200 D $ 57.1701 92,208 D
Common Stock 05/29/2012 S 200 D $ 57.18 92,008 D
Common Stock 05/29/2012 S 100 D $ 57.185 91,908 D
Common Stock 05/29/2012 S 100 D $ 57.19 91,808 D
Common Stock 05/29/2012 S 200 D $ 57.21 91,608 D
Common Stock 05/29/2012 S 200 D $ 57.23 91,408 D
Common Stock 05/29/2012 S 500 D $ 57.27 90,908 D
Common Stock 20,000 I ( 1 ) By Mother ( 1 )
Common Stock 120,875 I ( 2 ) By Brother Albert Chao ( 2 )
Common Stock 46,005,277 I TTWF LP and TTWFGP LLC Trusts
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
Reporting Owners
Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Chao James
2801 POST OAK BLVD.
HOUSTON, TX77056
X X Chairman 10% Owner
Signatures
James Chao by Stephen Wallace POA 05/31/2012
Signature of Reporting Person Date
Explanation of Responses:
( 1 )Even though reporting person and reporting person's mother share a household, the reporting person 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.
( 2 )Even though reporting person and reporting person's brother, Albert Chao, share a household, the reporting person 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.

Remarks:
46,005,277 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.

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