Portfolio Diversification and Net Selectivity Performance of Mutual Funds in Iran by Using Fama Decomposition Model

T he main purpose of this paper is to analyze the performance of mutual funds in Iran by using Fama decomposition model (1972). Thus, daily data of 55 mutual funds during a four-year period from 21/3/2014 to 21/3/2018 were investigated. To achieve this goal, firstly, the performance of mutual funds was broken down into Fama components, and it was shown that the diversification performance and risk performance of mutual funds were negative, but net selectivity performance was positive. Finally, the panel method was used to investigate the effect of Fama's components on the performance of mutual funds. The results indicated that the effect of Fama's components on the performance of mutual funds is positive, and the effects of the net selectivity and risk are more than diversification.