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Stock Trading History of Yousaf Shahed

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Yousaf Shahed since year 2005. The trader's CIK number is 1223027. At the time of this reporting, Yousaf Shahed is the President, Research Biotech of Sigma Aldrich Corp (stock ticker symbol SIAL).

Stock purchases, sales, and option exercises reported by *Yousaf Shahed* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-08-01	SIAL	Sigma Aldrich Corp	Sale	2,000	46.00	92,000
2007-07-30	SIAL	Sigma Aldrich Corp	Option Exercise	141,008	35.98	5,074,069
2006-12-08	SIAL	Sigma Aldrich Corp	Option Exercise	1,500	36.50	54,750

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Yousaf Shahed (President, Research Biotech of Sigma Aldrich Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.