This paper presents an empirical study on the effects of various factors on firm value including capital structure, firm size, asset growth, etc. The proposed study gathers the necessary information from selected firms listed on Tehran Stock Exchange over the period 2006-2010. In our study, all firms maintained the same fiscal calendar and there were active during the period of study. The results of our study indicate that there was a meaningful relationship between capital structure and firm value. In addition, there was a meaningful relationship between asset growth and increase on firm value. However, our study did not show any meaningful relationship between firms’ size as well as revenue growth and firms’ value.