Masayoshi Son Uses All His Bullets, Selling Assets and Borrowing Big to Back OpenAI

The all‑in bet

Masayoshi Son appears to be wagering SoftBank’s (软银) future on one company: OpenAI. It has been reported that SoftBank Group is pursuing a record-sized, roughly $40 billion, 12‑month bridge loan from a syndicate led by top U.S. banks — reportedly including JPMorgan — to fund further investments in OpenAI. Son has already sold chunks of other holdings, pledged Arm shares as collateral and tapped capital markets; now he is leaning on cheap leverage and illiquid paper to press his advantage in the AI race.

How the financing is structured — and why it matters

The loan would be unusually large for a single short-term corporate facility and, reportedly, will be priced over SOFR amid a higher perceived risk: SoftBank still carries a speculative credit rating (S&P BB+, Moody’s Ba3), meaning the interest spread will be materially above investment‑grade terms. Banks underwriting the deal are effectively taking security in SoftBank’s most liquid asset, Arm — SoftBank owns roughly 90% of Arm, which has been valued at around $160 billion on Nasdaq — plus any OpenAI equity it receives. That arrangement makes lenders more exposed to Arm’s share price than to OpenAI’s early‑stage economics. If Arm’s stock falls, banks could demand additional collateral or repayment — a classic margin‑call danger.

A pattern born of regret

Why such desperation? Son’s behavior is shaped by past mistakes. He famously trimmed an early Nvidia stake and later called the sale one of his biggest regrets as Nvidia became the backbone of the AI hardware boom. Reportedly, SoftBank began a multi‑year pursuit of OpenAI after ChatGPT’s debut: a modest $500 million entry in 2024 followed by a much larger $30 billion lead investment in 2025. SoftBank now reportedly holds roughly 11–13% of OpenAI and plans additional tranches; cumulative exposure has been reported in the tens of billions of dollars. Son is betting on a life‑changing payoff — or a painful collapse.

Stakes and geopolitical angle

This is not just a corporate financing story. It underscores how global AI capital flows are concentrated in U.S. Big Tech and investment banks, and how an Asian conglomerate is levering U.S. markets to chase a privately held Silicon Valley champion. SoftBank’s position is purely financial: OpenAI’s governance structure limits investor control, so Son buys upside without board influence. That raises a question: is this portfolio leverage or a geopolitical signal of confidence in U.S. AI leadership? Either way, if the AI valuation narrative cools or Arm stumbles, SoftBank could face losses larger than previous bruises such as WeWork — and international lenders could be left holding the bill.