Related Party Transactions and Outside Related Director Information

Sigma-Aldrich Corporation (SIAL)

3/14/2006 Proxy Information

Mr. Harvey has been Chairman of Sigma-Aldrich Corporation since January 2001 and was Chief Executive Officer for more than five years until December 2005.

3/26/2003, 3/23/2004, 3/29/2005 and 3/14/2006 Proxy Information

No related party transactions or special relationships reported for this company. Director relationships marked "Outside Related" at this firm will most often be former executives of the company. Additional information regarding these relationships will be added during our regular updates.