
Sy Harding’s strategy advanced the “Sell-in-May” concept- also called the Halloween Indicator. His research led to the conclusion that there are better dates for seasonal timing than simply investing at the turn of month in May and November. He also exploited the fact that the favorable and unfavorable seasons did not start and begin on the same day each year much like the seasons in weather.
When I was researching easy-to-execute strategies that could be applied to retirement fund index investing, his seasonal timing strategy leaped to the front of the line and remained there.
