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ABSTRACT The objective of research was using Single Index Model to make decision for optimal stock investment. The samples consist the elimination of shares in LQ-45 companies totaling 33 (thirty three) shares from 2017 until 2018. The data analysis method use Microsoft Excel with twelve steps to analyze this research. The results of the research are 15 (fifteen) shares forming companies optimizing the stock portfolio. The proportion of funds to get an optimal stock portfolio are ASII with a proportion of 29.70%, KLBF with a proportion of 34.17% and PGAS with a proportion of 36.13%. Expected Return Portfolio formed was 1346.36%, portfolio variance formed was 0.019% and portfolio risk was 0.063%. The result also present that the Single Index Model was able to provide information to investors and prospective investors to get optimal stock investment. The Single Index Model can provide information about funding amount from each stock, expected returns and risks for investors and potential investors. Key word : stock portofolio, LQ-45, single index model, investment risk