The efficient market hypothesis is one of the most important theories in finance. According to this hypothesis, a stock with sound laws, good functions, high transparencies, and extensive competitions, all valuable information timely, accurately, fully reflected trend prices including current future values enterprises. Unless there are manipulations, it would be impossible for investors gain mo...

the purpose of this article is to present the summary of all the research done on the weak form of efficient market hypothesis. these tests include normality test of return distribution, auto correlation test. run test and filter tests.