He purpose of this paper is to test the CAPM and APT pricing model for pricing petrochemical companies in Tehran Stock Exchange. In this regard. seasonal data related to stock returns of 18 active chemical and petrochemical companies in the stock market and some important macroeconomic variables as risk factors in the period 1395-1386 were used. First. https://www.roneverhart.com/Pinata-Cookie-Cutter/