Explain the Pattern of Family Ownership on the Performance of Listed Companies in Tehran Stock Exchange

The main target of this research is to explain the pattern of family ownership on the performance of listed companies on the Tehran stock exchange from the year 2006 to 2011.In this research family Ownership has been surveyed as an independent variable and the influence of it on the Return on asset as the criteria of Firm performance has been studied. Firms in which at least 20% of their exchange is handling with individual or group families member or at least one of the relatives are board of directors of executive manager has been counted as family firms. The result of analyzing 95 Firms during 2006 till 2011 on 95% level of confidence shows that: The rate of family Ownership has the positive and direct influence of the performance of firms (ROA).From the family Ownership rate of 50% and higher, family Ownership has direct and meaningful influence of the performance of the firms and this is not valid for lower rates. Also with the increasing of the rate of family Ownership the coefficients amount has increase which shows that with increasing the rate of family Ownership its influence intensity of it on the Firm performance increases. The existence of family Ownership has the positive and direct influence of the performance of Firms (ROA).