Explore the vast range of titles available.

Importance of investment for economical and social growth is as much as introduce as strong leverages in order to achieve development. However, it should be noted that amount of attention to this in positive process can lead to boom of economy and lack of attention to this process leads to economic crisis and negative process. Shareholders or structural ownership is one of important factor of corporate governance and affect motivation of shareholders. Thus, corporate governance has essential effect on efficiency of each company. The main question of the research is stock return and ownership structure on risk of investment. Therefore, in order to answer this question, the authors used 284 samples of companies during 2007-2011 in Tehran Stock Exchange. They used multiple regression in order to test hypotheses. Results indicated that there was not significant relationship exists between ownership structure and risk of investment.