Dealmaking brothers Michael and Yoël Zaoui were key advisers to SoftBank on its $40bn sale of UK chip designer Arm Holdings to US tech firm Nvidia, a megadeal on which the Japanese conglomerate brought in boutique banks.

Zaoui & Co, the advisory boutique set up by former Goldman Sachs and Morgan Stanley bankers Michael and Yoël in 2013, advised SoftBank on the transaction announced on 14 September, according to a person familiar with the matter.