Tech stocks tank as a Chinese competitor threatens to upend the AI frenzy; Nvidia sinks nearly 17%

NEW YORK (AP) — Wall Street’s superstars tumbled Monday as a competitor from China threatens to upend the artificial-intelligence frenzy they’ve been feasting on. The S&P 500 dropped 1.5%, dragged down in large part by a 16.9% fall for Nvidia. Other Big Tech stocks also...