How major US stock indexes fared Friday 7/17/2026

Major US stock indexes declined sharply on July 17, 2026, with the S&P 500 down 1%, the Dow Jones Industrial Average down 0.8%, and the Nasdaq composite down 1.4%. The sell-off in AI-related stocks, particularly affecting Nvidia and chip companies, contributed to global market declines, while Brent crude oil prices rose 4.6% amid Iran war concerns.