A spokesperson at SoftBank, which bought Arm for $32 billion in 2016, declined to comment on Wednesday.
Arm, whose technology underpins the global smartphone industry and is used in supercomputers, said in March it would pursue a U.S.-only listing this year, ending speculation about a primary or secondary listing in the UK.
In June, Son said that Nasdaq was a favourite exchange for listing Arm, one of the sprawling conglomerate's prize assets.
(Reporting by Kiyoshi Takenaka; Editing by Richard Chang)
