Pengujian Efisiensi Pasar Pada Pasar Modal Indonesia Periode Juni 2009 - Juni 2015 (Studi Pada Indeks Harga Saham Gabungan)

This study aims to test the capital market in Indonesia is weak form efficient during the period June 2009 – June2015 by examining the evaluation of movement from the return of JCI. The object of this study were daily, weekly,and monthly returns obtained from the closing price of the composite stock price index during the study period. Thetwo conventional ways, run-test and autocorrelation test are used to prove the evidences of weak form marketefficiency. Beside those two methods, unit root test also added to analyze JCI. The result of the research shows inthat period the movement of JCI return is random so it’s categorized as weak form efficient market. The run-test ofthree returns resulted of random movement during the period June 2009 – June 2015. The autocorrelation test ofthree returns resulted that there was no autocorrelation either positive or negative, it shows that the current returnmovement isn’t influenced by the previous return so that’s random. Different from the previous two tests, unit roottest conclude that three returns are stationary so they don’t move randomly. The non-randomness of three returnscan be due to deviations in the efficient market testing called noise. It’s difficult for stock analysts to determine theworthiness of a stock price if the stock price information is incomplete and incorrect. The implication of this studythat efficient market needed precise, accurate, and fast information.Keywords: market efficiency, Indonesia capital market, Jakarta composite inde