Why investors shouldn’t be spooked by fears of an October stock-market crash

The idea that October is uniquely dangerous for stocks is a well-worn piece of market folklore, rooted in memorable episodes such as 1929 and 1987. But a calendar month, on its own, is not a market fundamental. It carries no earnings information, no policy signal and no change in economic conditions. That makes October-related selling a useful example of how sentiment can diverge from underlying value.

For markets, the more relevant question is what such episodes do to prices. When fear of a seasonal crash prompts investors to sell indiscriminately, it can push valuations away from what company fundamentals would justify — a gap that historically has drawn buyers rather than repelled them. In other words, the belief itself can create the conditions it warns against, briefly and unevenly.

What to watch: whether October weakness is broad-based or concentrated in a few names, and whether it arrives alongside genuine changes in earnings, rates or credit conditions. Absent those, seasonal anxiety is a sentiment story, not a fundamental one.