SoftBank CEO Masayoshi Son

SoftBank CEO Masayoshi Son

Junko Kimura/Bloomberg

Masayoshi Son, chairman and chief executive officer of SoftBank Corp., has transformed SoftBank, founded in Tokyo in 1981 as a wholesaler of packaged computer software, into a full-fledged telecommunication operator via acquisitions, including that of the Japanese unit of Vodafone Group Plc.