Corporate Offices

Sigma-Aldrich Corporation
3050 Spruce Street, St. Louis, Missouri 63103
800-521-8956, Fax: 314-286-7874
e-mail: sig-ald@sial.com, Web site: sigma-aldrich.com

Transfer Agent

ComputerShare
Chicago, Illinois, 312-588-4991

Annual Meeting

Date: May 7, 2002
Time: 11:00 a.m.
Place: Sigma-Aldrich Life Science and High Technology Center
2909 Laclede Ave.
St. Louis, MO 63103

General Information

Shares traded on NASDAQ National Market System
Trading symbol: SIAL
Options traded on the Chicago Board Options Exchange

10-K

A copy of the Company's Form 10-K annual report, as filed with the Securities and Exchange Commission, may be obtained without charge by writing to the Secretary, Sigma-Aldrich Corporation, P.O. Box 14508, St. Louis, Missouri 63178

© 2002 Sigma-Aldrich Co. Sigma-Aldrich brand products are sold exclusively through Sigma-Aldrich, Inc.
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