ISS have reportedly said Softbank’s offer could provide Sprint with enough capital to upgrade its network in order to compete against larger US rivals AT&T and Verizon.
The announcement comes as Sprint mulls over a rival bid of $25.5 billion from Dish Networks.
ISS has not, however, determined whether Dish’s offer was superior because it has yet to be presented to investors.
Sprint shareholders are set to vote on Softbank’s offer on June 12.
