On February 10, 2009, SEC issued the final rule mandating that the 500 largest public companies start to file their financial results using XBRL. The effective date of the new rule is April 13, 2009, which means that most of the largest public issuers are required to file their quarterly results using XBRL for fiscal period ending on or after June 15. By 2010, all accelerated filers must comply with the new rule and by 2011 all public companies will have to file using XBRL.