Sigma-Aldrich Corporation to Present at the Nasdaq 21st Investor Program on Wednesday, May 21, 2008

ST. LOUIS, May 15 /PRNewswire-FirstCall/ -- Sigma-Aldrich Corporation will be presenting at the NASDAQ 21st Investor Program on Wednesday, May 21st at 10:45 AM GMT in London - 5:45 AM US/CDT.

Interested parties may listen via live audio broadcast over the Internet available at http://ir.sigmaaldrich.com. Users can click the “Webcast” icon to access this file. For the webcast on http://ir.sigmaaldrich.com users will need to have Media Player software, which can be downloaded at http://www.microsoft.com/windows/windowsmedia/9series/player.aspx.

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 7,900 employees providing excellent service worldwide. We are committed to accelerating our 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: Debbie Bockius of Sigma-Aldrich Corporation, +1-314-286-8015,
dbockius@sial.com

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

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