The main purpose of this paper is to investigate the effect of business risk on pricing models in petrochemical companies. In this regard, the financial information of the companies that had shares admitted to trading on the Tehran Stock Exchange during 2011-2015, was collected. The research method is descriptive and correlational. The econometric method namely panel data was used for hypothesis test. According to the results of F-Limer and Hausman tests, fixed effects model was chosen as the most efficient econometric technique in this study. The results show that all the research variables namely operational leverage, sales risk, operational risk, firm size, return on asset to capital ratio and future growth opportunities (except financial leverage) had a positive and significant effect on pricing of the companies’ stocks. Business risk and types of it made a positive and significant different on stock pricing.
