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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1262823	Westlake Chemical Corp	WLK	Industrial Organic Chemicals (2860)	760346924

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1299505	James Chao	2801 Post Oak Blvd. Houston TX 77056	Director	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2012-08-22	33,802	$14.24	124,710	No	4	M	Direct
Common Stock	Disposition	2012-08-22	33,802	$69.03	90,908	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Option (right to buy)	Disposition	2012-08-22	33,802	$0.00	33,802	$14.24

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2012-02-13	2019-02-13	No	4	M	Direct

Footnotes

The number of shares of common stock held by the reporting person was incorrectly reported on the first transaction shown on the reporting person's original Form 4 filed August 24, 2012 (and correspondingly on each subsequent transaction shown on such Form 4), and was also incorrectly reported on the subsequent Forms 4 filed by the reporting person on December 10, 2012, December 11, 2012, December 12, 2012 and January 10, 2013.
In accordance with the Securities and Exchange Commission's No Action Letter dated June 25, 2008, we have aggregated the sales that occurred on August 22, 2012 for ease of reporting. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $69.00 to $69.0801, 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 (2) to this Form 4. The transactions were shown individually on the reporting person's original Form 4 filed August 24, 2012.
The derivative securities were previously reported as being acquired instead of disposed of. In addition, the number of derivative securities beneficially owned following reported transaction was previously incorrectly reported as 149,644.