Sigma-Aldrich Corporation Declares Increased Quarterly Dividend; Announces Live Webcasts Of Presentations At Two Upcoming

  Sigma-Aldrich Corporation Declares Increased Quarterly Dividend; Announces
          Live Webcasts Of Presentations At Two Upcoming Conferences

PR Newswire

ST. LOUIS, Feb. 13, 2013

ST. LOUIS, Feb. 13, 2013 /PRNewswire/ -- Sigma-Aldrich Corporation (NASDAQ:
SIAL), a leading Life Science and High Technology company (the "Company"),
announced an increase of 7.5% in its quarterly cash dividend to $0.215 per
share. The increased dividend was approved by the Company's Board of
Directors on February 12, 2013 and is payable on March 15, 2013 to
shareholders of record at the close of business on March 1, 2013.

The Company also announced it will be presenting at the following investor
conferences in February:

  oLeerink Swann Global Healthcare Conference 2013 on Thursday, February 14,
    2013 in New York City, presenting at 12:00 P.M. (Eastern).
  o2013 Citi Global Healthcare Conference on Monday, February 25, 2013 in New
    York City, presenting at 9:35 A.M. (Eastern).

Interested parties may listen via live audio broadcast and view the
presentation slides over the internet available at
http://investor.sigmaaldrich.com/. Users can click the "Webcast" icon to
access the files.

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 and genomic research, biotechnology, pharmaceutical
development, the diagnosis of disease and as key components in pharmaceutical
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 nearly 9,000 employees
providing excellent service worldwide. The Company 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

Website: http://www.sigmaaldrich.com
Contact: Debi Fakes, Investor Relations, Sigma-Aldrich Corporation,
+1-314-286-8015, Debi.fakes@sial.com