# AI Selloff Pulls S&P 500 Down 1.2% as Nasdaq Slides 2.6% The S&P 500 suffered its worst day since July as renewed concern over costly artificial-intelligence investment hit technology shares, while strength elsewhere left the Dow narrowly higher. By The Signal Edition Newsroom | Markets and economy / Markets Published: 2026-10-22T17:58:00Z Updated: 2026-10-22T23:16:00Z Canonical: https://thesignaledition.com/article/nasdaq-ai-selloff-oil-p87fza Image: https://thesignaledition.com/media/1c5b46f345fc8ebeca147e653b165ed9.avif (Screens and trading desks on the floor of the New York Stock Exchange; credit: Source: New York Stock Exchange) ## Key points - The S&P 500 fell 93.74 points, or 1.21%, to 7,663.43 on Oct. 22. - The Nasdaq Composite dropped 694 points, or 2.60%, to 26,008.86, its steepest percentage decline since June 5. - The Philadelphia Semiconductor Index plunged 6.7%, while the Dow edged up 11.89 points. - Most New York Stock Exchange issues advanced, showing that the damage was concentrated in technology and AI-linked shares. ## Technology shares drive the decline U.S. stocks ended sharply lower on Thursday, Oct. 22, as renewed doubts about the cost and eventual payoff of artificial-intelligence investment hit the technology companies that carry heavy weight in the major indexes. The S&P 500 lost 93.74 points, or 1.21%, to close at 7,663.43, while the Nasdaq Composite fell 694 points, or 2.60%, to 26,008.86, according to closing figures reported independently by Reuters and The Associated Press. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) [2](https://apnews.com/article/stocks-wall-street-nasdaq-dow-1970e79d013cbddcae89c53b4b98f384) The Nasdaq recorded its largest one-day percentage decline since June 5. Semiconductor shares absorbed the hardest selling: the Philadelphia Semiconductor Index dropped 6.7%, its steepest fall since June 23, and Intel, Advanced Micro Devices, Sandisk and Marvell each lost more than 8%, Reuters reported. The chip index was more than 26% below its June 22 record close after the session, though it remained up 51.5% for 2026. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) ## Pressure was concentrated rather than universal The headline indexes masked a more divided market. The Dow Jones Industrial Average gained 11.89 points, or 0.02%, to 52,867.98, and the small-company Russell 2000 added 0.1% to 2,784.03. Advancing stocks narrowly outnumbered decliners on the New York Stock Exchange, while losses were broader on Nasdaq, according to Reuters. The Associated Press similarly noted that most U.S. stocks rose even as weakness among the largest technology companies pulled the capitalization-weighted S&P 500 lower. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) [2](https://apnews.com/article/stocks-wall-street-nasdaq-dow-1970e79d013cbddcae89c53b4b98f384) Meta Platforms fell 7% despite beating analyst expectations after reporting its first cash outflow in more than a decade and outlining a share structure intended to help finance AI spending. Tesla declined 3.1% after reducing its 2026 capital-spending forecast. Those reactions reinforced investor concern that enormous AI infrastructure commitments may take longer to generate returns than optimistic valuations assume. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) ## Oil and rates add to uncertainty Geopolitical pressure also shaped the session. Oil prices touched a five-month high after new strikes against Saudi targets, raising concern that energy costs could keep inflation elevated and limit the Federal Reserve's room to reduce interest rates. Treasury yields declined as investors moved toward safer assets. Even after Thursday's retreat, the S&P 500 and Nasdaq Composite were both up 11.9% for the year, according to AP's closing-market tally. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) [2](https://apnews.com/article/stocks-wall-street-nasdaq-dow-1970e79d013cbddcae89c53b4b98f384) A market correction normally means a decline of at least 10% from a recent peak. Thursday's move did not by itself establish that threshold for the S&P 500, so describing the broad index as being in a correction would be premature. Investors will next assess whether the concentrated technology decline spreads to the wider market as more third-quarter earnings arrive and companies provide updated guidance on AI spending, financing costs and expected returns. [1](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) [2](https://apnews.com/article/stocks-wall-street-nasdaq-dow-1970e79d013cbddcae89c53b4b98f384) ## Sources 1. [Reuters: S&P 500, Nasdaq end sharply lower as revived AI doubts ignite tech selloff](https://www.reuters.com/business/nasdaq-futures-drop-over-1-ai-worries-resurface-oil-climbs-2026-10-22/) (2026-10-22) 2. [Associated Press: How major US stock indexes fared Thursday 10/22/2026](https://apnews.com/article/stocks-wall-street-nasdaq-dow-1970e79d013cbddcae89c53b4b98f384) (2026-10-22)