The purpose of this research was to analyze the amount of company`s information through the annual accounts and audit reports, in order to assess whether it is enought to meet the needs of users of accounting. This study was based on the audit reports and the annual accounts of the companies of the Madrid Stock Exchange and Eurostoxx50 (2004-2007). In addition, the statistical techniques were applied in order to test the established hypotheses. It has been proven that the annual accounts and the audit reports present sufficient information of the companies to satisfy the needs of the users. It is suggested that regulators in accounting matters expand the requirements on the dissemination of mandatory information, to obtain greater transparency of the data disseminated; Also, in relation to companies, more initiatives in the dissemination of voluntary information.