Investigating the Effect of Ownership Focus on Company Performance with Respect to the Quality of Investor Support in Companies Listed on the Tehran Stock Exchange

The main purpose of this study is to investigate the effect of ownership concentration on company performance with respect to the quality of investor support in companies listed on the Tehran Stock Exchange. The statistical sample of the research includes 120 companies listed on the Tehran Stock Exchange during the years 2014 to 2019. The statistical method used to test the hypotheses presented in this research is the "composite data regression model". The research findings show that the concentration of ownership will not significantly increase or decrease the company's performance. Therefore، there is no significant relationship between the concentration of ownership and the performance of companies. On the other hand، it can be seen that the quality of investor support has had a positive and significant effect on the company's performance. Therefore، the concentration of ownership and performance of the company is clearly adjusted to the quality of investor support، so the concentration of ownership of companies in corporate activities and capital distribution in order to invest in business activities، grant facilities، etc. can not affect the company's Tobin Q index. In general، the results show that the theorists of the organization should pay more attention to the power and interests of large shareholders and set up an appropriate oversight mechanism that limits the power of large shareholders.