Forbes real‑time billionaire list shows SoftBank founder and CEO Masayoshi Son’s net worth dropped 13% in one day, falling $13.2 billion to $87.1 billion and slipping behind Mukesh Ambani and Gautam Adani. SoftBank Group shares have tumbled more than 17% over the past three trading days to ¥7,414, leaving a market capitalisation near ¥42.35 trillion; storage firm Kioxia has overtaken SoftBank, costing it the title of Japan’s largest market cap company.

2026-06-04

Forbes real‑time billionaire list shows SoftBank founder and CEO Masayoshi Son’s net worth dropped 13% in one day, falling $13.2 billion to $87.1 billion and slipping behind Mukesh Ambani and Gautam Adani. SoftBank Group shares have tumbled more than 17% over the past three trading days to ¥7,414, leaving a market capitalisation near ¥42.35 trillion; storage firm Kioxia has overtaken SoftBank, costing it the title of Japan’s largest market cap company.