StocksMediumUpdated•Originally published 16 October 2026•Updated 16 October 2026•
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S&P 500 and Nasdaq Slide Amid AI Sector Selloff
Key Facts
1The S&P 500 and Nasdaq indices dropped sharply in the final hour of trading as an AI-related selloff weighed on equities.
The S&P 500 and Nasdaq indices dropped sharply during the final hour of the trading session. MarketWatch reported that the decline was driven by selling pressure in the artificial intelligence sector, which dragged down broader equity markets in late-day trading.
This downward movement follows broader volatility in technology-related equities, where NDAQ closed at $93.5 on October 15, 2026. The stock saw a session high of $93.75 and a low of $92.12 during that day's trading prior to the most recent sector-wide selloff.
Latest Updates · 1
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Update: The S&P 500 fell 1.95% for the week ending October 16, 2026. This decline marks the index's worst weekly performance since late June.