The purpose of this study is the Effect of Customers value disclosure in The Web site firms on cost of equity in the Tehran Stock Exchange. Economic theory suggests, generally the disclosure of information With the cost equity is a negative relationship, because the disclosure of information reduces the information asymmetry. The cost of equity based on Good and Mohan ram (2003) is calculated. Customers’ value disclosure level in The Web site firms based on the quantitative and qualitative criteria weighted index is calculated. The level of competition in the industry is a factor affecting the relationship between the disclosure of customer value and cost of equity. Size of firm, market-to-book ratio and return on assets of firm are considered as control variables. The sample consisted of 97 firms, listed firms on the Tehran Stock Exchange during the years 2012 to 2015 is. Research hypotheses based on least squares multiple regression model using cross-sectional data were analyzed. The results of the research show that the Customers value disclosure based on quantitative and qualitative items does not affect the cost of equity firms. Also, disclosing the Customers value disclosure based on the quantitative and qualitative items in the competitive industry does not affect the cost of equity.