PEMBENTUKAN PORTOFOLIO SAHAM-SAHAM PERUSAHAAN YANG TERDAFTAR DI JAKARTA ISLAMIC INDEX (JII)

he most important goal of this research is to know the optimal portfolio and the optimal composition of capital in the company's shares are listed on Jakarta Islamic Indexs. This research were single indexs model. Single Indexs Model is a model of portfolio analysis uses by account of ERB value and Ci value to get the optimal shares on portfolio. Value of Ci is limiting the value of what was said ERB high. The population of this research is all shares which include on Jakarta Islamic Index, and using purposive sampling methode to get the sample. The sample in this research is shares included in the index JII, with a limited on shares which did not the stock split, reverse stock and new listing period between October to December 2008 and the period from January to March 2009. The results of this research, in the first period October - December 2008 and the two-month period from January to March 2009, the optimal portfolio is not formed, because the value of all shares ERBi smaller than the value of Ci, so that does not produce an optimal composition of capital or the proportion of funds invested in the second period. Keywords: Optimal Portfolio, Investment, Return, Ris