ST. LOUIS, May 2, 2011 /PRNewswire/ -- Sigma-Aldrich Corporation (NASDAQ: SIAL) will be presenting at the following investor conferences in May:

    --  Deutsche Bank 26th Annual Health Care Conference on Wednesday, May 4,
        2011, at the Intercontinental Boston, Boston, MA, presenting at 10:00 AM
        (ET).


    --  Baird's 2011 Growth Stock Conference on Tuesday, May 10, 2011, at the
        Four Seasons Hotel, Chicago, IL presenting at 11:15 AM (CT).

Interested parties may listen via live audio broadcast over the Internet available at http://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 40 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 http://www.sigma-aldrich.com.

SOURCE Sigma-Aldrich Corporation