Why the ‘Halloween Indicator’ isn’t working — and what smart investors are doing instead

The "Halloween indicator" — the adage to sell in May and return after October — has disappointed its followers this year. Rather than drifting lower through the summer months, equities delivered gains, meaning investors who stepped aside missed part of the rally. The episode is a reminder that seasonal patterns are tendencies drawn from historical averages, not guarantees, and that acting on them can mean forgoing returns when the pattern fails to repeat.

Market relevance lies in what the divergence says about the drivers behind prices. Seasonal folklore offers no view on earnings, interest rates or valuation, which are the factors that typically shape medium-term outcomes. When a calendar rule and fundamentals point in different directions, the calendar usually tells you less.

What to watch: whether the pattern reasserts itself into year-end, and whether investors continue rotating toward diversified, fundamentals-aware approaches rather than timing entries and exits around dates. For most portfolios, the lesson is about process — not prediction.