NEW YORK (AP) — A plunge for Nvidia’s stock is pulling the U.S. market lower, threatening to upend the AI boom that has carried Wall Street to record after record in recent years. The S&P 500 fell 0.7% Thursday. The weakness for AI stocks sent the Nasdaq composite down 1.5%, while the Dow Jones Industrial Average added 127 points. Nvidia tumbled 14% after Jensen Huang, its co-founder and face of the brand, resigned as CEO. Other stocks in the AI industry also fell, though some of Nvidia’s rival chip companies rose. Oil prices swung after President Donald Trump said he’s no longer interested in a deal with Iran.