Stock Trading History of Keffer Richard A

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 Keffer Richard A since year 2005. The trader's CIK number is 1316562. At the time of this reporting, Keffer Richard A is the General Counsel & Secretary of Sigma Aldrich Corp . (stock ticker symbol SIAL). See this page for all insider trading activities at Sigma Aldrich Corp .

Stock purchases, sales, and option exercises reported by insider *Keffer Richard A* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-08-28	SIAL	Sigma Aldrich Corp	Option Exercise	2,600	36.40	94,640
2006-10-31	SIAL	Sigma Aldrich Corp	Purchase	1,000	74.10	74,100

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 Keffer Richard A (General Counsel & Secretary of Sigma Aldrich Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.