Sigma-Aldrich to Present at Upcoming Investor Conferences


ST. LOUIS, March 4, 2011 - Sigma-Aldrich Corporation (Nasdaq: SIAL) will be presenting at the following investor conferences in March:

o 31st Annual Cowen and Company Healthcare Conference on Tuesday, March 8,
2011, at the Boston Marriot Copley Place, Boston, MA, presenting at
10:15 AM (EST).

o Barclays Capital 2011 Global Healthcare Conference on March 15, 2011, at
the Loews Miami Hotel, Miami, FL, presenting at 10:15 AM (EDT).

Interested parties may listen via live audio broadcast over the Internet available at investor.sigmaaldrich.com/. Users can click the "Webcast" icon to access this file.

About Sigma-Aldrich: Sigma-Aldrich is a leading Life Science and High Technology company. Its biochemical and organic chemical products and kits are used in scientific research, including genomic and proteomic research, biotechnology, pharmaceutical development and as key components in pharmaceutical, diagnostic and other high technology manufacturing. The Company has customers in life science companies, university and government institutions, hospitals, and in industry. Over one million scientists and technologists use its products. Sigma-Aldrich operates in 38 countries and has 7,900 employees providing excellent service worldwide. Sigma-Aldrich is committed to Accelerating Customer Success through Innovation and Leadership in Life Science, High Technology and Service. For more information about Sigma-Aldrich, please visit its award-winning Web site at www.sigma-aldrich.com.

SOURCE Sigma-Aldrich Corporation

CONTACT: Carrie Fields, Investor Relations of Sigma-Aldrich Corporation, +1-314-286-8015, carrie.fields@sial.com

Web Site: www.sigma-aldrich.com

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