Stock market today: Dow, S&P 500, Nasdaq sink as AI valuation concerns mount amid bleak jobs data

US stocks took a sharp turn lower Thursday morning as concerns about Big Tech continued to dog markets and private jobs data showed a tough month for layoffs in October. The tech-heavy Nasdaq Composite (^IXIC) led the way lower, sliding 1.6%. The S&P 500 (^GSPC) lost 0.9%, and the Dow Jones Industrial Average (^DJI) sank around 0.8%. The market received bearish data on jobs Thursday morning, as a report from the global outplacement firm Challenger, Gray & Christmas showed that last month was the worst O ...