Sigma-Aldrich Corporation Annual Shareholder's Meeting

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Tue Apr 19, 2011 12:09pm EDT 

ST. LOUIS, Mo., April 19, 2011 (GLOBE NEWSWIRE) -- Sigma-Aldrich Corporation
(Nasdaq:SIAL) will hold its Annual Meeting of Shareholders on Tuesday, May 3,
2011, at 11:00 a.m. Central Time (12:00 p.m. Eastern Time).

  Date:       May 3, 2011      
  Time:       11:00 AM CT      

Webcast and slide presentation can be accessed at Sigma-Aldrich Corporation's
website at http://investor.sigmaaldrich.com.

Sigma-Aldrich is a leading Life Science and High Technology company committed to
Enabling Science to Improve the Quality of Life. Its chemical and biochemical
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 7900 employees providing excellent service worldwide. For more
information about Sigma-Aldrich, please visit its award-winning Web site at
http://www.sigma-aldrich.com.

CONTACT: Carrie Fields
         Investor Relations
         +1 314 2868015
         carrie.fields@sial.com
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