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The Halloween Indicator, 'Sell in May and Go Away': Another Puzzle
Ben Jacobsen Massey University - Department of Economics and Finance, Albany; New Zealand Institute of Advanced Study Sven Bouman Saemor Capital July 1, 2001 Abstract: We document the existence of a strong seasonal effect in stock returns based on the popular market saying 'Sell in May and go away', also known as the 'Halloween indicator'. According to these words of market wisdom, stock market returns should be higher in the November-April period than those in the May-October period. Surprisingly, we find this inherited wisdom to be true in 36 of the 37 developed and emerging markets studied in our sample. The 'Sell in May' effect tends to be particularly strong in European countries and is robust over time. Sample evidence, for instance, shows that in the UK the effect has been noticeable since 1694. While we have examined a number of possible explanations, none of these appears to convincingly explain the puzzle.
Keywords: Stock returns, Sell in May, Return predictability, Halloween indicator JEL Classifications: G1 Working Paper SeriesDate posted: April 15, 1998 ; Last revised: October 31, 2009Suggested CitationContact Information
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