Sigma-Aldrich Corporation to Open NASDAQ Market on Wednesday, February 20, 2008

Sigma-Aldrich Corporation , a leading Life Science and High Technology company headquartered in St. Louis, Mo., will open the NASDAQ Stock Market in a special event on February 20, 2008. The event celebrates the Company's 33-year business and NASDAQ trading anniversary. The Company's CEO, Jai Nagarkatti, and NASDAQ's CEO, Bob Greifeld, will preside at the ceremony.

Launched in 1975 through the combination of Sigma Chemical Company and Aldrich Chemical Company, Sigma-Aldrich has experienced above-market revenue growth, continued dividend increases and 15% compound annual growth in its stock price over its 33-year history. Key drivers of the Company's successful performance include:

About Sigma-Aldrich: Sigma-Aldrich is a leading Life Science and High Technology company. Our biochemical and organic chemical products and kits are used in scientific and genomic research, biotechnology, pharmaceutical development, the diagnosis of disease and as key components in pharmaceutical and other high technology manufacturing. We have customers in life science companies, university and government institutions, hospitals and in industry. Over one million scientists and technologists use our products. Sigma-Aldrich operates in 36 countries and has over 7,800 employees providing excellent service worldwide. We are committed to accelerating Customers' success through leadership in Life Science, High Technology and Service.

For more information about Sigma-Aldrich, please visit our award-winning web site at http://www.sigma-aldrich.com.



CONTACT: Kirk A. Richter, Treasurer of Sigma-Aldrich Corporation,
+1-314-286-8004

Web site: http://www.sigma-aldrich.com/

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