Sigma-Aldrich to Present at the Baird 2008 Growth Stock Conference on Tuesday, May 13, 2008


ST. LOUIS, May 6 -- Sigma-Aldrich Corporation (NASDAQ:SIAL) will be presenting at the Baird 2008 Growth Stock Conference on Tuesday, May 13th at 1:20 PM CT in Chicago.

Interested parties may listen via live audio broadcast over the Internet available at ir.sigmaaldrich.com/.

Users can click the "Webcast" icon to access this file.

For the webcast on ir.sigmaaldrich.com/ users will need to have Media Player software, which can be downloaded at http://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 www.sigma-aldrich.com/.

FCMN Contact: carrie.fields@sial.com

Source: Sigma-Aldrich Corporation

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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