** Shares of U.S. AI stocks fall premarket amid a broader selloff with chipmakers leading declines

** Shares of Nvidia NVDA.O, Advanced Micro devices AMD.O, Broadcom AVGO.O, Marvell Technology MRVL.O, Micron Technology MU.O and U.S.-listed shares of TSMC 2330.TW fall between 3% and 4%

** If losses hold, NVDA set to extend its four-day losing streak

** AI cloud firms Microsoft MSFT.O, Salesforce CRM.N, Oracle ORCL.N and Snowflake SNOW.N fall between 1.5% and 2.5%

** World share markets fell sharply on Monday after U.S. President Donald Trump said tariffs would essentially cover all countries

** AI server makers Hewlett Packard Enterprise HPE.N, Dell DELL.N and Super Micro Computer SMCI.O fall between 2% and 4%

** Up to last close, S&P 500 .SPX index is down 5.1% YTD

(Reporting by Zaheer Kachwala in Bengaluru)

((Zaheer.Kachwala@thomsonreuters.com))