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St. Louis, MO - September 28, 2015 Sigma-Aldrich and Merck KGaA, Darmstadt, Germany, Making Progress Toward Completion of Planned Acquisition

Sigma-Aldrich Corporation (NASDAQ: SIAL) announced today it is making progress toward closing the planned acquisition of the Company by Merck KGaA, Darmstadt, Germany. The closing is now expected within the next two months.

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St. Louis, MO - September 22, 2015 Sigma-Aldrich Named to Dow Jones Sustainability Indices

Only St. Louis-Based Company on List, Earns Ranking for Third Consecutive Year

Sigma-Aldrich Corporation (NASDAQ: SIAL) was recently named to the Dow Jones Sustainability Indices (DJSI), a list of leading companies from around the world in terms of their social, environmental and economic performance. Sigma-Aldrich, which has been named for three consecutive years, is the only St. Louis-based company to receive this designation. 

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St. Louis, MO - September 17, 2015 Sigma-Aldrich Announces Exclusive Distribution Agreement with IROA Technologies, LLC

Provides Researchers with Global Access to IROA Technologies' Mass Spectrometry Metabolite Library of Standards

Sigma-Aldrich Corporation (NASDAQ: SIAL) announced today it has signed an exclusive global distribution agreement with IROA Technologies, LLC to distribute IROA's Mass Spectrometry Metabolite Library of Standards™ (MSMLS). The agreement partners IROA's MSMLS product portfolio and software with the industry-leading eCommerce and supply chain capabilities of Sigma-Aldrich.

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St. Louis, MO - September 16, 2015 Aldrichimica Acta Ranked First in Organic Chemistry by Impact Factor

Sigma-Aldrich (NASDAQ: SIAL) announced today that the Aldrichimica Acta, its highly acclaimed chemistry review journal, recently received an Impact Factor score of 17.083 and was ranked number one among 54 international journals in the field of Organic Chemistry. This is the 11th year in a row in which the Acta has ranked number one in this category. Impact Factor data and other journal metrics are published by Thomson Reuters, which tracks more than 8,000 international science journals annually and offers objective statistical data for ranking journals by relative importance within their subject categories.

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