How the investors react to the received information plays a crucial role in determining the return of stock exchange market. Supply and demand based upon incorrect decisions lead to the price deviation of inherent values. This paper aims to study the impact of salience phenomenon on disproportionate pricing and investor overreaction in the corporates in Tehran stock exchange. Research methodology is correlative. Statistical sample involves 120 corporates accepted by Tehran stock exchange during 2012-2016. To test the hypotheses, a regression analysis method has been selected. Research findings have indicated that there exists a promising phenomenon in Tehran stock exchange causing the investors overreaction followed by the disproportionate pricing and also, the results have shown that the impact of salience is different on strong and weak information environments.