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The S&P 500 Has Fallen in 56% of Septembers Since 1928. Here's What That Means for Artificial Intelligence (AI) Stocks.

Don't fret too much about the possibility of another September slump.

The S&P 500 Has Fallen in 56% of Septembers Since 1928. Here's What That Means for Artificial Intelligence (AI) Stocks.

Published August 31, 2026 · Category: Finance

Overview

Some investors dread the end of the summer, mostly because of the so-called "September Effect," which shows that, on average, the market tends to decline during that month.

Indeed, Bank of America research finds that in 56% of the Septembers since 1928, the S&P 500 has fallen, and that over that period, the index has averaged a return of about negative 1.17% in Septembers.

Details

And even AI stocks aren't immune. The September Effect typically spans sectors, and it's coming at a time when some investors are already growing wary of the artificial intelligence trade.

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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.