U.S. equity markets experienced a notable downturn on Thursday, November 6, 2025, as resurgent worries over artificial intelligence (AI) valuations weighed heavily on investor sentiment. All three major indexes closed lower, marking a shift from earlier mixed trading sessions. The tech-heavy Nasdaq Composite led the declines, falling 1.9%, while the benchmark S&P 500 dropped 1.1%, and the blue-chip Dow Jones Industrial Average shed 0.8%. This broad-market retreat underscores a cautious mood as investors scr ...