Born 1957 Japan (Korean descent). UC Berkeley Economics. Founded SoftBank 1981. Vision Fund 1: $100B (2017, largest ever). Invested: ARM, Boston Dynamics, Cruise, Humane ($230M). In 2026 Son went all-in on AI: SoftBank committed $30B+ to OpenAI (securing a $40B bridge loan in Mar 2026), SB Energy joined the $500B Stargate initiative with a 1.2GW Texas data-center campus, and SoftBank agreed to buy ABB's robotics unit for $5.4B. It is preparing to float Roze AI — a robotics + data-center-construction business — in a US IPO targeting a ~$100B valuation (possibly H2 2026); Son calls the AI revolution '50x bigger than the dot-com boom.'