This research aims to explore the existence of three well - known seasonal anomalies – the January Effect, the April Effect, and the Halloween Eff ect – as pertains to monthly returns as well as to volatility. Effects on returns and volatility will further be studied within the SET Energy index as well as 9 selected energy stocks from the period April 2005 to July 2016. The objective of this study is to find seasonality hidden within the above Index and stocks, and establish a simple trading strategy to ...