The Dow Jones Industrial Average lost 305 points Monday to 51,841, while the S&P 500 slipped 0.2% and the Nasdaq edged down 0.05%.
Apple fell 2.1% after hitting record highs Friday, with likely profit-taking in the iPhone maker weighing on the blue-chip index.
Oil added to the cautious tone: front-month WTI crude rose 0.9% to $82.49 a barrel and the 2-year Treasury yield climbed to 4.208%.
Big Tech earnings now dominate the near-term outlook, with Tesla and Alphabet due Wednesday, Microsoft and Meta on July 29, and Apple and Amazon on July 30.