Washington on Tuesday said it plans to halt shipments to China of more advanced artificial intelligence chips designed by Nvidia and others. It also restricted a broader swathe of advanced chips and chipmaking tools to a greater number of countries including Iran and Russia, and blacklisted Chinese chip designers Moore Threads and Biren. China's CSI Semiconductor Index (.CSI931865) dropped 1.4% on Wednesday following the announcement, while the STAR Chip Index (.STARCHIP) lost 1.2%. AI stocks were further hit after the U.S. announced further controls on Nvidia chip exports to China, UBS wrote in a note to clients. Moore Threads said it was communicating with all parties involved and evaluating the impact.

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Persons: Janet Yellen, Mark Schiefelbein, Biden, Moore, Yang Wang, Charlie Chai, Xi Jinping, Biren, Shen Yiming, Bernadette Baum, Kirsten Donovan Organizations: Treasury, Rights, Washington, Nvidia, CSI Semiconductor, U.S, UBS, Biren, Thomson Locations: United States, Diaoyutai, Beijing, China, Rights SHANGHAI, BEIJING, U.S, Iran, Russia