The purpose of this study was to find viable shares in the optimal portfolio as well as the proportion of funds from each of these stocks formed with the Markowitz Model. This research method uses literature research design. Data collection techniques are documentation. While the analysis of research data is started with the processing and preparation of data until interpreting the meaning of data. The population in this study was all companies listed in the LQ Index 45 as of December 31, 2019.

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... While the sample is Companies that never exited the LQ 45 Index during the period 2015-2019. The results of this study showed that the shares of LQ Index 45 companies in the period 2015 – 2019 which formed an optimal portfolio based on the Markowitz model of 150 stock portfolios. From the overall weighting obtained the results of a portfolio of shares 40% ADRO & 60% BBCA, 50% ADRO & 50% BBCA and 60% ADRO & 40% BBCA are optimal portfolios for aggressive investor profiles, furthermore 40% BBCA stock portfolio & 60% UNVR, 50% AKRA & 50% BBCA, 60% BBCA & 40% GGRM are optimal portfolios for conservative investor profiles. While the stock portfolio of 40% BBCA & 60% BBTN, 50% BBCA & 50% BBTN and 60% BBCA & 40% BBTN is the optimal portfolio for the profile of moderate investors