The Halloween Effect in Global Equity Markets

Summary

The document describes the Halloween effect, a seasonal equity timing pattern in which returns have historically been stronger from November through April than from May through October. Its basic rule is to hold global equities during the winter half of the year and move to cash during the summer half. Variants include rotating between Northern and Southern Hemisphere markets or between cyclical and defensive shares. The cited international research reports the pattern in 36 of 37 developed and emerging markets studied, while other papers discuss a global sector rotation approach.

Proposed explanations include seasonal changes in risk aversion associated with seasonal affective disorder and an optimism cycle in which investors become hopeful toward year end before expectations fade. The cited studies do not establish a single convincing cause, and the document stresses that practical use should be supported by research. It describes the approach as a market timing overlay rather than a direct hedge, and says any modified hedging version needs rigorous testing. The excerpt provides no complete performance series, transaction cost analysis, or current validation.

Key ideas

• The basic timing rule holds global equities from November through April and cash from May through October.
• The cited research reports a related seasonal return pattern across many international markets.
• Possible explanations include changing seasonal risk aversion and an investor optimism cycle.
• The evidence does not settle the cause of the effect.
• The approach is described as an equity allocation overlay, and modified hedging uses require rigorous backtesting.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.