Voluntary disclosure, Institutional investors, Concentration of ownership

One of the literature accounting and financial management, corporate governance, because it is believed that the mechanism of corporate governance receiver capabilities are used That have a direct impact on the ability of investors to force management to efficient use of existing resources in organizations are. The main role of financial reporting, effective in delivering information to people outside the organization credible and timely manner. Managers can use their knowledge about the company's business activities to improve the effectiveness of financial faces, as a means of conveying information to investors and potential creditors, use one of the modes of transmission of information, disclosure of which would be financed through faces. In this study, the relationship between ownership concentration and the percentage of institutional ownership has been dealt with voluntary disclosure data on the five-year period between the years 1389-1393 the firms listed in the Tehran Stock Exchange has been extracted. In order to analyze and test data, statistical software was used Excel and Eviews. The results of tests indicate that the concentration of ownership and the percentage of institutional ownership have a significant relationship with the voluntary disclosure.