ABSTRACT This study aims to determine the differences in portfolio performance on the Bisnis-27 and Jakarta Islamic Index 70 (JII70) stocks during the period 2020- 2021 using the Markowitz model. The research method used in this study is a comparative method. This study uses secondary data. The population in this study is 27 shares of the Bisnis-27 Index and 51 shares of the Jakarta Islami…