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This study is aimed at developing and validating an index designed to measure the level of social disclosure of external social programs of firms listed on the Brazilian stock market.

The index of social disclosure is composed of 13 items distributed in three dimensions: past information, prospective actions, and accessibility. Its validation involved: (a) pre-test, (b) analysis by referees, (c) exploratory factor analysis, (d) Cronbach’s alpha test, and (e) final validation. The sample is composed of 83 Brazilian firms listed on the Brazilian Stock Exchange from 2005 to 2009.

The index presented robustness in all validation stages. It was found that size, industry sector, internationalization, auditing, and listing on social responsible investment funds are decisive factors for increasing the level of social disclosure.

The index of social disclosure evaluates external social programs only. Hence, some types of social information are not captured, such environmental ones. Besides, the sources of information for the index are restricted to annual and sustainability reports, so that information from other sources, such as official announcements and company websites, are not captured.

The social disclosure index developed can be useful to analysts and investors assessing listed firms, as well as to financial-market regulators defining policies applicable to the disclosure of corporate social information.

(a) Construction of a social disclosure index validated and tested in Brazilian firms, which is liable to replication; (b) Utilization of a representative sample of firms listed on an important emerging stock market.