SoftBank Group is trading 6.77% down at ¥3,980.00; reports linked the November 5 decline to concerns about tighter U.S. data-center rules. - The broader AI and semiconductor selloff added pressure, as investors worried regulation could slow infrastructure investment. - Reports said China may block SoftBank’s proposed ABB robotics acquisition, while Arm’s outlook disappointed investors. - Available coverage does not establish which factor drove the full move.