Why did the Nasdaq 100 crash more than 550 points today? US stock market Dow Jones, S&P 500 and Nasdaq plunge into deep red as AI's biggest winners become the market's biggest losers

US stock market crash today: The Nasdaq just delivered a sharp reality check to Wall Street. On June 9, 2026, the tech-heavy Nasdaq Composite plunged 2.17%, losing more than 560 points as AI and semiconductor stocks extended their recent sell-off. The S&P 500 fell 1.22%, shedding over 90 points, while the Dow Jones Industrial Average slipped 0.43%, down about 216 points. The Nasdaq 100 suffered the deepest damage, tumbling more than 750 points from its intraday high as investors rushed to lock in profits from the market's biggest AI winners.

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