Wall Street is tumbling on fears the big U.S. companies that have feasted on the artificial-intelligence frenzy are under threat from a competitor in China

U.S. technology shares dropped sharply on Monday as surging interest in Chinese startup DeepSeek's low-cost artificial intelligence model raised doubts about the sector's lofty valuations. The tumble in global equities prompted a widespread flight to safety,

Wall Street’s main indexes opened lower on Monday (Jan 27), as the surging popularity of a low-cost Chinese artificial intelligence model sparked a selloff in chipmaker Nvidia and other companies that stand to benefit from investments into the technology.