Mostafa Damankhorshid - Department of accounting, Aliabad Branch, Islamic Azad University, Aliabad, Iran
Ahmad Abdollahi - Faculty member of accounting Department, Golestan institute of Higher Education, Gorgan Iran

Disclosure of information reduces information asymmetry between managers and owners andlimits the opportunities for earnings management. On the other hand, institutional investors cantransmit confidential information from management to other shareholders, but to validate suchmonitoring, institutional investors should continue to invest for a period of time that is longenough and moreover, maintain sufficient stocks to reduce the free-rider problem. The presentpaper aims to investigate the relationship between information asymmetry, earnings managementand investment fund monitoring in companies listed on the Tehran Stock Exchange; accordingly,three hypotheses have been proposed and tested. The research population consists of 84companies listed in the Tehran Stock Exchange, whose data related to a 5-year period (2007-2011) have been collected and analyzed. The results of this study confirmed the first hypothesisand rejected the second and third hypotheses. According to the findings, the level of earningsmanagement is directly and significantly related to the ratio of market value to book value,ownership concentration, state ownership, and financial needs of the sample companies. Also, ingeneral, investment funds have no role in balancing managers’ financial reporting behavior whilethe separation of samples into two groups including companies with high and low informationasymmetry showed that in companies with low information asymmetry, ownership of investmentfunds leads to higher levels of earnings management

ownership concentration, short-term investment fund, long-term investment fund,information asymmetry, earnings management