Sigma-Aldrich Corporation Named to Euronext Vigeo World 120 Index

St. Louis, Mo., June 24, 2013 /3BL Media/ - Sigma-Aldrich Corporation (Nasdaq: SIAL) was recently named to the Euronext Vigeo World 120 Index, a comprehensive sustainability index that recognizes companies that demonstrate a strong commitment to corporate and social responsibility.

“At Sigma-Aldrich, we understand the importance of paying close attention to what we do and how those activities could impact the environment and our communities,” said Rakesh Sachdev, Sigma-Aldrich President and CEO. “Dedication to good global citizenship benefits the Company, our stakeholders and our employees.  Sigma-Aldrich is proud to be acknowledged for its efforts.”

This is the first time Sigma-Aldrich has been featured on the Euronext Vigeo World 120 Index. The index, a partnership between Vigeo, a leading European leading European ESG research agency and NYSE Euronext, a global operator of financial markets and provider of trading technologies, ranks companies based on their commitment to the environment, government and social issues. Ratings are centered on 38 criteria that include:  respect for the environment; human rights and recognition of companies’ human capital; relations with stakeholders; corporate governance and business ethics; integrity in influencing policy; and efforts to fight corruption.

“In the past few years, Sigma-Aldrich has put even greater emphasis on corporate and social responsibility,” said Steve Walton, Sigma-Aldrich Vice President of EH&S, Compliance and Sustainability. “The Company understands the role we play in the global community and is focused on finding even more ways to make a difference.”

About NYSE Euronext
NYSE Euronext (NYX) is a leading global operator of financial markets and provider of innovative trading technologies. The company's exchanges in Europe and the U.S. trade equities, futures, options, fixed‐income and exchange‐traded products. With approximately 8,000 listed issues (excluding European Structured Products), NYSE Euronext's equities markets – the New York Stock Exchange, NYSE Euronext, NYSE MKT, NYSE Alternext and NYSE Arca – represent one‐third of the world's equities trading, the most liquidity of any global exchange group. NYSE Euronext is in the S&P 500 index. For more information, please visit: http://www.nyx.com.

About Vigeo
Vigeo is the leading European expert in responsible performance. Founded in 2002 and headed by Nicole Notat, Vigeo measures the performances and risks of more than 2000 companies, local authorities and countries in the world with regard to six areas of social responsibility: the environment, human rights, human resources, business behavior and corporate governance. Vigeo’s rating research meets high quality standards and is externally certified to the Arista® standard. Vigeo is present in Paris, Casablanca, Brussels, Milan, London and Tokyo, and has more than a hundred employees. www.vigeo.com

About Sigma-Aldrich
Sigma-Aldrich is a leading Life Science and High Technology company whose biochemical, organic chemical products, kits and services are used in scientific research, including genomic and proteomic research, biotechnology, pharmaceutical development, the diagnosis of disease and as key components in pharmaceutical, diagnostics and high technology manufacturing. Sigma-Aldrich customers include more than 1.3 million scientists and technologists in life science companies, university and government institutions, hospitals and industry. The Company operates in 38 countries and has nearly 9,100 employees whose objective is to provide excellent service worldwide. Sigma-Aldrich is committed to accelerating customer success through innovation and leadership in Life Science and High Technology. For more information about Sigma-Aldrich, please visit its website at www.sigmaaldrich.com.

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Sigma-Aldrich Corporation
Jeffrey Whitford
+ (1) 314-286-7810
jeffrey.whitford@sial.com

Media Relations
Jen McMahon
+ (1) 314-236-0986
jen.mcmahon@sial.com