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AI Stocks Pull the Indexes Down Despite a Broader Crowd Rising

October 23, 2026 at 6:01 PM EDT · New York time

AI-sector declines helped pull markets lower Thursday as concerns about datacenter and chip costs weighed on technology stocks. The S&P 500 fell 1.2 percent, its worst day since July, and the Nasdaq composite dropped 2.6 percent. Yet most US stocks rose, and the Dow Jones Industrial Average added 11 points. The market's largest technology influences made the overall picture look gloomier than the experience of much of the individual-stock crowd. Oil prices also reached their highest levels since May amid worries about the war with Iran. That supplied another significant source of global market concern alongside the assessment of AI spending. The day was not a clean experiment isolating one cause, even if the technology losses dominated the indexes. For Americans following retirement accounts or broad market funds, the divergence illustrates how an index can fall while a majority of its components advance. Size matters in the calculation, not merely the number of companies having a decent afternoon. The AI industry's infrastructure appetite thus acquired a familiar financial consequence: investors began paying less attention to the inspirational rendering and more attention to the construction bill. Many stocks managed to enjoy the day anyway. They simply lacked sufficient weight to change the expression on the official group photograph.

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