Özet:

January effect means that stock returns are higher in January than in any other month of the year. The aim of this study is to investigate whether there is a January effect on Borsa İstanbul (BIST 100) stock returns and volatility with GARCH, EGARCH and TGARCH models. For this purpose, the daily stock return closing values covering the period of 04.01.2010-18.02.2020 were used. According to the findings, while January effect was observed on stock returns, no effect was found on volatility. In addition, it was determined that negative shocks are more effective than positive shocks in EGARCH and TGARCH models created to determine leverage effect.

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