Traders work on the floor of the New York Stock Exchange (NYSE) on Nov. 13, 2025 in New York City.U.S. markets had their worst day since Oct. 10. That marks a sharp reversal for the Dow Jones Industrial Average, which shed 1.65% to settle at 47,457.22, a day after it closed above 48,000 for the first time. Meanwhile, the S&P 500 lost 1.66% and the Nasdaq Composite tumbled 2.29%.The slump in stocks can partly be traced to a turnaround in sentiment regarding artificial intelligence. Tech behemoths such as Nvi ...