Sigma-Aldrich Corporation (SIAL) Chief Executive Officer to Ring the NASDAQ Stock Market Opening Bell


ADVISORY, Feb. 19, 2008 (PRIME NEWSWIRE) --



 What:
 Dr. Jai Nagarkatti, CEO of Sigma-Aldrich Corporation (SIAL), will
 preside over the NASDAQ opening bell to celebrate two Company
 milestones: the first year of sales exceeding $2 billion, and 33 years
 on the NASDAQ.

 Where:
 NASDAQ MarketSite - 4 Times Square - 43rd & Broadway - Broadcast Studio

 When:
 Wednesday, February 20, 2008 at 9:30 a.m. ET

 Contacts:
 Sigma-Aldrich:
 Garry Clark; 917.972.6855
 gclark@ricochetpr.com

 NASDAQ MarketSite:
 Jolene Libretto; 646.441.5220
 Jolene.Libretto@nasdaq.com

Feed Information:

The opening bell is available from 9:20 a.m. to 9:35 a.m. on Galaxy 26 - uplink IA6 C band / transponder 24, downlink frequency 4180 horizontal. The feed can also be found on Waterfront fiber 1623. If you have any questions, please contact Jolene Libretto at (646) 441-5220.

Radio Feed:

An audio transmission of the opening bell is also available from 9:20 a.m. to 9:35 a.m. on uplink IA6 C band / transponder 24, downlink frequency 4180 horizontal. The feed can be found on Waterfront fiber 1623 as well.

Webcast:

A live webcast of the NASDAQ Opening Bell will be available at: http://www.nasdaq.com/reference/marketsite_about.stm.

Photos:

To obtain a hi-resolution photograph of the Market Open, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market open of your choice.

About Sigma-Aldrich Corporation (SIAL):

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 36 countries and has 7,900 employees providing excellent service worldwide. Sigma-Aldrich is committed to Accelerating Customer Success through Leadership in Life Science, High Technology and Service. For more information about Sigma-Aldrich, please visit its award-winning web site at http://www.sigma-aldrich.com.