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SoftBank Surges to Top of Japan After €75 Billion France AI Data-Center Push

Investor buying has priced Masayoshi Son’s concentrated stakes in Arm and OpenAI while exposing financing, governance, competitive risks

Overview

  • SoftBank announced up to €75 billion to build AI data centers and compute clusters in France, a move the company frames as a major bet on next‑generation AI infrastructure.
  • Masayoshi Son publicly called the AI era far larger than the dot‑com boom and said market pullbacks would be buying opportunities for his long‑term thesis.
  • The stock rally that followed pushed SoftBank’s market value above Toyota and boosted Son’s estimated net worth, with investors crediting gains in Arm and OpenAI exposure.
  • Analysts warn the gains rest on concentrated, partly illiquid positions and on funding that has relied on loans and asset sales, raising leverage and governance concerns.
  • Key things to watch are delivery of the France buildout, Arm’s ability to scale chip sales, OpenAI’s path to a public listing, and competitive pressure from Anthropic and open‑source models.