TOKYO :Swiss Bank UBS has re-hired Masazumi Toriyama to head its Japanese unit's global banking division, according to an internal memo seen by Reuters and confirmed by the company on Wednesday. Toriyama, who previously spent 18 years at UBS, will start on August 4, replacing interim head Yasunori Saku, who will become chairman of Global Banking Japan, the memo said. The moves are part of an ongoing expansion targeting a 50 per cent increase in the division's headcount, a UBS spokesperson said.