S&P said a listing for chip designer Arm, which has become a primary preoccupation for the group's chief Masayoshi Son, would improve asset liquidity

SoftBank has reportedly picked Goldman Sachs, JPMorgan Chase, Barclays and Mizuho Financial Group to lead the US listing.

The China business is the exclusive distributor of Arm chip technology in China and develops and sells its own chip designs based on Arm