Abstract The main objective of the present study is to evaluate the effect of accounting conservatism on long-term stock return after initial offering in the Tehran Stock Exchange. The present study is descriptive-correlational in terms of the type of study. The statistical population includes the listed companies on Tehran Stock Exchange during 2003-2013 and a total number of 69 companies with initial public offering was assessed for this purpose. For the purpose of this study, four hypotheses were formulated using the ordinary least squares regression method and were analyzed using SPSS and Eviews statistical software. The results of the study indicate a positive relationship between conservatism in the year before public offering and long-term stock return after initial public offering. However, the results show that there is no significant relationship between conservatism in the year of initial public offering and long-term return of stock after initial public offering. Other results also suggest that in the information asymmetry setting there is a positive relationship between conservatism in the year before initial public offering and long-term return of stock after the initial public offering. In addition, in the information setting there is also a positive relationship between conservatism in the year of initial public offering and long-term stock return after the initial public offering. Since no other study is conducted on this topic in Iran so far, the present project can contribute greatly to the issue.

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