The Value Relevance of Mandatory disclosure: Empirical Evidence from Listed Companies at Tehran Stock Exchange (TSE)

Dissemination of financial and non-financial information in different sections is the duty of firms. Management, creditors, investors and others, use the disclosed information contained in the financial reports to form judgments about the operating performance and financial position of the company. Empirical studies so far conducted by different researchers have revealed that a good disclosure improves analyst's forecasts accuracy about future earnings. The companies disclose information voluntarily or by force. Considering developing economy of Iran, SEO (Securities and Exchange Organization) as capital market authority is setting rules and regulations and all listed companies in Iran emerging market are required to fully comply with mandatory disclosure requirements. Now, the question is whether information disclosed by force improves the relationship between current stock return and future earnings, and provides more information to stockholders. Experimental investigation by using information from a sample consisting of 151 firms from among TSE listed companies during the period 1381 to 1388 (2002-2009) have shown that the disclosures made in firms reports are containing information about the future earnings, which are being utilized by investors in their decisions. In the other word, disclosed information are value relevance.