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Stock Trading History of Van Den Dool Gerrit

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 Van Den Dool Gerrit since year 2005. The trader's CIK number is 1201803. At the time of this reporting, Van Den Dool Gerrit is the Other of Sigma Aldrich Corp (stock ticker symbol SIAL).

Stock purchases, sales, and option exercises reported by *Van Den Dool Gerrit* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-11-01	SIAL	Sigma Aldrich Corp	Option Exercise	38,400	34.11	1,309,884

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 Van Den Dool Gerrit (Other of Sigma Aldrich Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.