Sigma-Aldrich Corporation (Nasdaq:SIAL) will be presenting at the following investor conferences in September: KeyBanc Capital Markets 2011 Basic Materials & Package Conference on Tuesday, September 13, at the InterContinental, Boston, MA, presenting at 9:00 AM (Eastern). Morgan Stanley Global Healthcare Conference on Wednesday, September 14, at the Grand Hyatt, New York, NY, presenting at 9:10 AM (Eastern). UBS 2011 Global Life Science Conference on Monday, September 19, at the Grand Hyatt, New York, NY, presenting at 12:00 PM (Eastern). 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.

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.

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