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The "September Effect" Is in Full Swing, With Stocks Slumping Left and Right. Here's How History Says Investors Should Respond.

The effect is real. Here's what you can do about it.

The "September Effect" Is in Full Swing, With Stocks Slumping Left and Right. Here's How History Says Investors Should Respond.

Published September 20, 2026 · Category: Finance

Overview

Beware the September effect!

Of all the calendar-related stock market phenomena -- like the Santa Claus rally in December or its follow-up January effect of small-cap stock pops -- none is as feared as this dreaded annual scourge.

Details

OK, that may be overstating it, but not by much. September is, in fact, the only month of the year during which both the Nasdaq Composite (NASDAQINDEX: ^IXIC) and the S&P 500 (SNPINDEX: ^GSPC) have a negative average return, finishing the month down more often than not.

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Source

Originally published at www.fool.com.

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Disclaimer: This article is for informational purposes only and does not constitute investment advice. Data may be delayed up to 15 minutes. Past performance is not indicative of future results. Consult a licensed financial advisor before making investment decisions.