The Calvert Social Index™ is a broad-based, rigorously constructed benchmark for measuring the performance of large, US-based socially responsible companies.

Calvert starts by taking the 1,000 largest companies in the US, representing stocks listed on the NYSE and NASDAQ-AMEX and ranks them in descending order based on their three-month average market capitalization.

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Calvert's Social Research Department conducts an audit including product safety, environment, workplace issues, international operations and human rights, community relations and weapons contracting on each company in the base of 1,000 companies. The stocks that meet Calvert's social criteria make up the Calvert Social Index.