THE INVESTIGATION OF SELL IN MAY AND GO AWAY AND JANUARY EFFECTS IN BORSA ISTANBUL: EVIDENCE FROM BIST 100

According to the efficient market hypothesis, financial markets are rational because financial actors are rational. This assumption means that investors cannot beat the market by obtaining abnormal returns. The two basic paradigms of finance field are rationality and the expected utility theory. With the studies carried out, it is documented that the individuals are not as rational as they are assumed and the market anomalies arose as a result of the transactions realized in the markets. In this study, it has been investigated whether the January Effect and Sell in May and Go Away are valid and whether it continues to be observed in Borsa ？stanbul. In the study, the methods of previous studies and the monthly data of BIST100 index for the period 1990-2017 were used. As a result of the study, it is seen that January returns in Borsa Istanbul do not differ significantly from other months, whereas Sell in May and Go Away Effect is valid