Abstarct: This research evaluates the performance of the winning and losing investment portfolios obtained from the efficiency scores of the DEA model, which in this regard are the fundamental internal factors of the input-output variables of the DEA model. The research sample includes 382 companies between 2011 and 2022. In order to calculate the performance scores of the tested companies using the DEA technique, 8 fundamental intra-company variables were used as model inputs and 7 intra-company fundamental variables baxsed on the research background were used as model outputs. The fundamental efficiency scores of the companies separately for each industry and baxsed on the fundamental variables within the company were calculated using the DEA model in MATLAB software and according to the upper and lower decile scores obtained from all the capital market companies during the time period under investigation. , winning and losing portfolios are formed, which are the winning portfolio with strong fundamental efficiency and the losing portfolio with weak fundamental efficiency. Finally, the market performance of two portfolios of winners and losers baxsed on six-month and one-year future returns as well as six-month and one-year adjusted future returns for these two portfolios have been evaluated using statistical tests and random dominance tests. The results of the research show that the future performance of the winning portfolio baxsed on six-month, one-year and one-year adjusted future returns is more significant than the future performance of the loser portfolio baxsed on six-month, one-year and one-year adjusted future returns respectively. This means that the fundamental strategy resulting from internal factors has been successful in obtaining six-month, one-year and adjusted one-year future returns, but the future performance of the winning portfolio is baxsed on the adjusted six-month future return of the future performance of the losing portfolio on the basis of returns. The six-month adjusted future is lower. This means that the fundamental strategy resulting from the internal factors of the company has not been successful in obtaining the adjusted six-month future return.