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History Says the Nasdaq-100 Does This in September. AI Investors Should Take Note.

Past patterns suggest that investors are heading into a rough month, but holding steady and staying in the market pays off over the long run.

History Says the Nasdaq-100 Does This in September. AI Investors Should Take Note.

Published August 28, 2026 · Category: Finance

Overview

Historically, September has been one of the worst months for stocks, with the S&P 500 (SNPINDEX: ^GSPC) averaging a decline each September from 1928 to 2023. That's not to say there haven't been profitable Septembers, but the average return being a decline suggests it's worth being prepared for a potentially bumpy month. In September 2022, for example, the S&P 500 dipped by 9.3%.

Looking at the Nasdaq-100, an index comprised of the 100 largest non-financial companies listed on the Nasdaq stock exchange, we also see that conditions have become noticeably bumpy around September in recent years. The historical performance of that index is worth paying attention to for artificial intelligence (AI) investors, as it currently includes tech heavyweights such as Advanced Micro Devices, ASML, Micron Technology, and Nvidia.

Details

Here's what the data tells us, as well as what history suggests is the best move to make during what's typically a turbulent month.

Continue reading

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.