Information Disclosure in the capital market is an instrument to reduce the Agency costs and asymmetry of information that it affects on expectations and, consequently, shareholders' decisions and it has value relevance with capital market variables. One of the most important items of disclosure in the capital market is disclosure of risk that it is required by the capital market plyers. In this paper, we investigate the relationship between value relevance of disclosure and risk reporting in the listed banks in Tehran Stock Exchange (TSE). We use annual financial statements of 19 listed banks in TSE for a period of 6 years during 1390 to 1395 by estimation three models for explaining the effect of disclosure and risk reporting on price, return and banks value with simple regression analysis through panel data. Results show that disclosure of risk has a positive and significant relationship with price and value of banks, and also has a negative and significant relationship with return. In general, the value relevance of risk disclosure of banks in Iranian capital market is confirmed.

Companies' voluntary disclosure is one of the most important management tools to convey information about the financial performance to investors, creditors and other stakeholders. One of the important reasons of the request for disclosure of information is agency problem and asymmetry of information. This study aims to examine value relevance of voluntary disclosure using models of Olson (1995), Easton and Harris (1991) and the value of firms with regard to the effect of endogeneity of voluntary disclosure variable. For this purpose, the voluntary disclosure index was calculated and tested for 146 companies listed in Tehran Stock Exchange during the period 1388-1392 using content analysis method and the same weighting approach. The results of this research reveal that companies' voluntary disclosure is used in their decision-making and valuation of companies. The results from the study of non-linearity in the relation between voluntary disclosure and firm value confirm the positive significant effect of enhanced voluntary disclosure levels on the value of firms.

The purpose of this study is to investigate the effect of voluntary disclosure on value relevance of earnings per share. The statistical society includes companies accepted in Tehran Stock Exchange (TSE), and the time span of the study is from the beginning of 2007 up to the end of 2010. Based on the assumption that an increased focus on the informational needs of investors should increase the quality of accounting information, we expect that greater voluntary disclosure levels will be associated with greater value relevance of earnings per share as one of the most important accounting information. The results show that voluntary disclosure no significant influence on the value relevance of earnings per share. An important reason for this conclusion can disability of investors and other users of the financial reports to use the accounting information to be disclosed.

High quality accounting information is a necessary condition for well-functioning capital markets and health of overall economy as a whole. It is also very important for investors, companies, and standard setters. Considering this fact, this study examines the effect of disclosure quality on the value relevance of financial statements items. For this purpose, first of all the value relevance of financial statements items and the value relevance of disclosure quality characteristic with future stock return are tested. Then, the effect of disclosure quality on the relationship between financial statements items and future stock return is examined. The statistical population is the listed companies in Tehran Stock Exchange during 1383 to 1391. Panel data regression analysis (Time-Fixed Effect Model and Time-Random Effect Model) and Wald Test are used as the research methods. The results indicate that financial statements items (except operating profit and debt ratio) and financial information reliability and timeliness characteristics have significant relationships with future stock return. Also, the results show that disclosure quality and communication score has no significant effect on the value relevance of financial statements items with future stock return.

In this study, the effect of companies' information disclosure quality on the value relevance of accounting earning in companies listed on the Tehran Stock Exchange has been investigated during the period 2010-2013.175 companies listed in Tehran Stock Exchange have been examined during the mentioned period.The panel/pooled regression analysis has been used to test the research hypotheses. In this study, the reliability and timeliness scores based on the companies' information disclosure status have been used to determine the companies' information disclosure quality as independent variables. Findings showed that according to the price and return model, the reliability of information disclosure has no effect on the value relevance of accounting earnings. However, the timeliness of firm information disclosure has a direct effect on the value relevance of accounting earnings, according to price and return model. Also, the auditor type and the book value have a significant and direct effect on the market value and the company size has a significant and negative effect on market value ratio.

Voluntary disclosure result to increasing value relevance because of increasing decision-making accuracy. In this study to evaluate the different decision making styles a cognitive and behavioral model are used. The field of this research in terms of territory subject to the "theory of information overload" and Processing "Brunswick Leans Model" is placed in behavioral accounting. This research has a quasi-experimental method. Research period are in 2012. For purposes of this study, experimental group (176 respondents) and control group (158 respondents) were classified in the four dominant styles: directive, analytical, conceptual, and behavioral. Also, investors in terms of the brain dominant style and cognitive complexity so as uncertainty about the tolerance level were classified. Evidence was presented that shows left-brain dominant style to spend more time on average to process information. Also, Analytical decision-making style than other styles as well as spend more time to process information. Indeed High complexity styles have Accuracy after Voluntary disclosure presented. But we didn’t find any relationship between Voluntary disclosure and other styles decision-making accuracy. So, we can result Voluntary disclosure don’t have respected to increasing value relevance.

Introduction: This research examines the relationship between environmental disclosure and corporate governance with the relevance to value and performance of the companies listed on the Tehran Stock Exchange. So, it helps the users to make a proper decision for optimal capital appropriation in the capital market, and it results in increasing the transparency of the decision-making environment.Method: The method of this research is correlational. The statistical population of this study contain the companies listed on the Tehran Stock Exchange during 2009-2013, and the sample of the research according to the screening method and after removing the irrelevant observations includes 137 companies. In this research, environmental disclosure and mechanisms of corporate governance have been considered as independent variables, and their relationship with the relevance to value and performance of the company has been examined by using panel data, multiple regression and by SPSS Software Version 19.Results: The results of the research indicate that the quality of environmental disclosure and mechanisms of corporate governance (including the percentage of non-executive managers of the board of directors, the percentage ownership of members of the board of directors, the chief executive officer, and the percentage of ownership of the institutional shareholders) have a direct and significant relationship with the relevance to value of shares of the Stock Exchange companies. Also, the quality of the environmental disclosure has a direct and significant relationship with the performance of shares of the companies.Conclusion: Due to the importance of the environmental disclosure in the field of public health, the results of the research show that even financial criteria are under the influence of environmental disclosure, and a special attention to such disclosure will be able to affect both social and financial requirements simultaneously positively.

This paper investigates Impact of Voluntary Disclosure Level on Value Relevance of Accounting Information, specifically, earnings and book values of Firms Listed in Tehran Stock Exchange (TSE). Based on the assumption that an increased focus on the informational needs of investors should increase the value relevance of the information contained in financial statements, As a consequence, we expect that greater voluntary disclosure levels among companies listed on the TSE will be associated with greater value relevance in earnings and book value information for investors. Statistical sample includes 71 companies during 2007 to 2011. Statistical technique used to test the hypotheses is the Multivariate Regression.The results for the price and returns models provide evidence that earnings and book values are significant factors in the valuation of firms Listed in TSE. Other results show that increasing the voluntary disclosure level, the information content of the book value increased, on the other hand the information content of earnings is the same information at all voluntary disclosure levels.