SoftBank Strategy Chief Plans Exit After Just Three Years Pavel Alpeyev, Giles Turner and Takahiko Hyuga, Bloomberg News Katsunori Sago Photographer: Keith Bedford/Bloomberg , Bloomberg (Bloomberg) -- SoftBank Group Corp.âs Chief Strategy Officer Katsunori Sago is planning to leave after less than three years at the company, people familiar with the matter said, as other executives gain prominence at the Japanese investment conglomerate. The Goldman Sachs veteran who joined SoftBank in June 2018 intends to resign by the end of March, one of the people said, asking not to be identified because the details are private. His actual departure may not take place till June, another person said. SoftBank representatives had no immediate comment.