News Release Details

BOSTON--(BUSINESS WIRE)--Mar. 23, 2012-- Cabot Corporation (NYSE: CBT) has been added to the Calvert Social Index®, a broad-based, rigorously constructed benchmark for measuring the performance of U.S.-based socially responsible companies.

Cabot has successfully met the sustainable and responsible standards set for the Calvert Social Index, and the Company’s inclusion in the Index affirms its commitment to environmental disclosure and management.

Calvert, a leader in sustainable and responsible investing, studies the 1,000 largest U.S. companies, and conducts sustainability audits on each company in the areas of: governance and ethics, environment, workplace, product safety and impact, community relations, international operations and human rights, and indigenous peoples’ rights. The companies that meet the Index’s sustainable and responsible criteria are selected for inclusion in the Index.

“One of Cabot’s great strengths is that our employees care deeply about the world they live in,” said Cabot President and Chief Executive Officer Patrick Prevost. “We are committed to keeping our people safe, making our operations sustainable, and improving the communities where we live and work.”

“Our latest sustainability report demonstrates our continued progress in this field,” Prevost said. “Cabot’s inclusion in the Calvert Social Index is another confirmation of our commitment to a sustainable future.”

To see more information regarding the Calvert Social Index, go to http://www.calvert.com/sri-index.html.

To learn more about Cabot’s commitment to sustainability, go to Cabot’s 2010/2011 sustainability report, “Sustainability Matters.”

About Cabot Corporation

Cabot Corporation is a global specialty chemical and performance materials company headquartered in Boston, Mass, USA. Cabot’s other major products are carbon black, fumed silica, inkjet colorants, aerogel, elastomer composites, and cesium formate drilling fluids. The company’s website is: http://www.cabotcorp.com.

About Calvert Investments

Calvert Investments is an investment management company that offers mutual funds and separate accounts to institutional investors, retirement plans, financial intermediaries, and their clients. By combining rigorous analysis with independent thinking, our disciplined approach to money management goes beyond traditional factors in order to manage risk and to identify investment opportunities with greater long-term potential. We offer more than 40 equity, bond, cash, and asset allocation investment strategies, many of which feature integrated corporate sustainability and responsibility research. Founded in 1976 and based in Bethesda, Maryland, Calvert Investments managed assets of more than $14 billion as of August 31, 2010. More information is available at www.Calvert.com.

Source: Cabot Corporation

Cabot Corporation
Susannah Robinson, 617-342-6129
Investor Relations
or
Vanessa Apicerno, 617-342-6015
Corporate Communications