This study applies descriptive research and quantitative approach upon 18 company's shares as the research samples. The samples are determined purposively after considering whether the shares listed in LQ-45 were included in the index, regular give dividends, and not doing the stock split during 2012-2014. Single Indeks Model is used in data analyzing. Fundings show that the optimal portfolio formed based on the highest stock price consists of 6 companies's stock are BBCA(34,00%), BBRI(45,18%), BBNI(14,91%), CPIN(2,78%), UNVR(1,00%), and BMRI(2,13%). This portfolio is resulting 1,74% return with 0,43% risk. Meanwhile, the optimal portfolio formed based on the lowest stock price consists of 4 companies's stock are UNVR(25.23%), BBCA(50.69%), BBRI(14.53%), and SMGR(9.55%). This portfolio is resulting 1,87% return and having 0,39% risk. The optimal portfolio formed based on close price consist of 6 companies's stock are UNVR(19,99%), BBCA(27,93%), BBRI(27,70%), BBNI(12,23%), INDF(3,85%), and BMRI(8,31%). This portfolio is resulting 1,85% return with 0,49% risk. Based on the research result, stocks of UNVR, BBCA, and BBRI are always chosen as the candidates of optimal portfolio.