US stocks today: US stocks open lower as Big Tech earnings rekindle AI spending worries; oil jumps

US stock markets opened sharply lower as Big Tech earnings revived concerns over heavy AI-related capital spending. The Dow Jones fell 463 points (0.89%) to 51755.54, the S&P 500 dropped 80.7 points (1.08%) to 7418.29, and the Nasdaq slumped 445.4 points (1.73%) to 25245.54. Oil prices also jumped, adding to the risk-off mood across global markets and likely weighing on Indian indices at open.