SoftBank’s High-Wire Act: 11% Plunge and a $40 Billion Reckoning Looming Over Son’s AI Empire

The numbers tell a story of extremes. SoftBank’s stock cratered more than 11% in Tokyo on June 4, closing at 7,377 yen, yet the annualized 30‑day volatility hit a breathtaking 109.67%. That whipsaw reflects the brutal math underpinning Masayoshi Son’s bet: a portfolio that bets the house on artificial intelligence, financed with staggering debt and a ticking $40 billion clock.

The immediate trigger was a broad sell‑off in US technology names — Nvidia and Broadcom led the rout — but SoftBank’s slide runs deeper. D.A. Davidson analysts call the group a “highly leveraged AI wager.” The concentration is acute: roughly 90% of Arm Holdings and an estimated 13% of OpenAI sit on the balance sheet. Both are unlisted or thinly traded, leaving the stock hostage to sentiment swings in an overheated sector.

The $40 Billion Crossroads

That leverage is about to come due. SoftBank secured an unsecured bridge loan worth $40 billion that matures in March 2027 — barely 21 months away. The company has pledged around $64 billion to OpenAI and is believed to be using its OpenAI stake as collateral for the “Stargate” AI infrastructure project. Credit analysts worry because OpenAI’s valuation, at more than 35 times revenue, would be hard to defend in a downturn.

S&P Global Ratings has already turned cautious, affirming a negative outlook on SoftBank. Total debt stood at 16.3 trillion yen ($104 billion) at the end of 2025. A recent subordinated bond issuance of 260 billion yen carried a coupon of 5.12% — the highest yield on any SoftBank yen bond in years. The market is demanding a premium for the risk.

Diversifying Beyond the Bet

While Son keeps his eye on the AI prize, the group is quietly building a financial‑services moat. PayPay, SoftBank’s payments arm, has agreed to buy 70.2% of T&D Financial Life Insurance for 134 billion yen (about $840 million). The deal, expected to close in October 2027, will be funded from PayPay’s own cash reserves. The aim is to embed life‑insurance products directly into the app, which boasts over 74 million registered users in Japan.

Should investors sell immediately? Or is it worth buying SoftBank?

To free up liquidity, SoftBank recently sold a 3.25% stake in Indian eyewear retailer Lenskart for roughly 28.73 billion rupees. Such asset sales provide breathing room, but they hardly dent the mountain of obligations.

The IPO Pipeline as Pressure Valve

Much of SoftBank’s narrative hinges on blockbuster listings. Anthropic has confidentially filed for an IPO, targeting a valuation of around $965 billion with a planned debut in October 2026. OpenAI is expected to follow. If these listings go smoothly, they could validate SoftBank’s private‑market bets and ease refinancing fears. If they stumble, the bridge loan becomes a very heavy anchor.

Meanwhile, Son is doubling down on physical AI. In France, SoftBank plans to build data centres with total capacity of 5 gigawatts, requiring investment of €75 billion. The first phase, 3.1 gigawatts in Hauts‑de‑France, is scheduled for completion by 2031.

Reading the Technical Signals

After the sharp sell‑off, the stock trades at €40.06 in German listings, down roughly 2% for the week but still up about 19% over the past 30 days. The relative strength index (RSI) has fallen to 57.3, indicating the shares are no longer overbought after the correction. TD Cowen maintains a “Hold” rating, a stance that neatly captures the tension between SoftBank’s long‑term AI story and its short‑term debt crunch.

The critical question is whether SoftBank can refinance that $40 billion bridge loan without drama before March 2027 — or whether the market’s patience runs out before then.