S&P 500, Nasdaq post worst day since July as AI trade falters

A hotter-than-expected September CPI print sent AI infrastructure stocks sliding and revived fears of Federal Reserve rate hikes The AI trade had its worst day in months, and inflation was holding the knife. On October 14, 2026, the S&P 500 fell 1.1% and the Nasdaq composite dropped 1.9%. That was the worst session for both indexes since July, and AI stocks led the retreat. The trigger was a September Consumer Price Index reading that came in hotter than Wall Street wanted. For a market that has leaned heavily on the AI growth story, that combination proved uncomfortable.

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