In a press release distributed on August 29, 2013 BM&FBOVESPA announced that, “Companies listed on BM&FBOVESPA and which publish a sustainability report or similar document, or explain why not, rose from 203 to 293 between May 2012 and June 2013. This is an increase from 45.31% to 66.29% of companies that are now in the Report or Explain voluntary initiative that the Exchange launched with the market in December 2011.”
You may read the press release on the BM&FBOVESPA internet site.
The press release provides a hyperlink to a table “that presents the links to the reports of companies publishing this information, the explanations of the companies that do not carry out the practice, and the companies that did not respond.”