The value of the company is very important for the shareholders, investors, managers, creditors and other stakeholders of the company in their assessment of the future of the company and its impact on the estimation of risk and return on investment and stock price. Also, the performance of a super-trusted manager can be examined in many ways because this characteristic Manager's behavior affects many of his decisions and policies. One of the main characteristics of these managers is that they often maintain unrealistic and unattainable goals due to their exaggerated admiration. Striving to achieve these goals drives them to participate. For this reason, overconfident managers are considered to have a large impact on company results. Therefore, the purpose of this research is to investigate whether managers' overconfidence has an effect on the value of companies listed on the Tehran Stock Exchange. The statistical population of companies admitted to the Tehran Stock Exchange between 1390 and 1400 and using the information of 186 companies and the multivariable linear regression method, the hypothesis was tested. According to the results of the research hypothesis test, it was observed that overconfidence of managers has a significant effect on the value of companies admitted to the Tehran Stock Exchange.