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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
1298632	R David Hansen	2801 Post Oak Blvd Houston TX 77056	Sr Vp Adminstration	No	Yes	No	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	Disposition	2012-08-06	24,342	$67.15	16,001	No	4	S	Direct

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

Footnotes

A sale transaction was erroneously reported on the reporting person's original Form 4 filed August 8, 2012. The line item reporting that 9,845 shares of common stock were sold at $67.0765 per share was actually a summary of certain other lines and was not, itself, a transaction. Therefore, the number of shares of common stock held by the reporting person was incorrectly reported with respect to 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 11, 2012 and March 4, 2013. In addition, the line item reporting that 500 shares of common stock were sold at $500 per share was incorrect. The $500 should have been $67.23.
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 6, 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 $67.01 to $67.255, 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 8, 2012.