Tech shares fall after Nvidia says new US controls on exports of AI chip will cost it $5.5 billion AP NewsNvidia takes $5.5 billion hit as US clamps down on its China chips CNNUS stock futures drop, Nvidia tumbles on new curbs on chip exports to China Yahoo FinanceStocks Tumble as Tech Investors Pull Back The New York TimesEuropean shares fall as ASML warns US tariffs cloud outlook Reuters