Masayoshi Son: The Tech World's Unstoppable Force

Early last year, Cheng Wei, founder and chief executive of the Chinese ride-hailing juggernaut Didi Chuxing, tried to resist taking money from legendary investor Masayoshi Son. Cheng told the SoftBank Group chief he didn't need the cash because his company had already raised $10 billion, according to people familiar with the matter. Fine, Son said, then suggested he might direct his support to one of Didi's rivals. Cheng relented and took the investment: $5 billion in the largest fundraising...