SoftBank Plunges 10% as $6 Billion OpenAI Margin Loan Stalls

SoftBank Group dropped as much as 11% in Tokyo on Tuesday before closing down 8.3%, wiping roughly $8 billion off its market value in a single session. The trigger wasn’t earnings or guidance. It was a Bloomberg report, carried by Reuters, that the company’s talks to raise a SoftBank margin loan backed by its OpenAI stake have stalled.

What began as a $10 billion pitch to creditors has shrunk to $6 billion, and even that looks uncertain. For a firm that has bet its balance sheet on artificial intelligence, the market’s reaction was swift and unsentimental.

The fall lands in the middle of a broader technology sell-off, but SoftBank’s pain is specific. Since September 2024, founder Masayoshi Son has committed up to $30 billion to OpenAI, turning the Japanese conglomerate into the ChatGPT maker’s largest financial backer. To fund it, SoftBank secured a $40 billion loan through a bridge facility in March, arranged by JPMorgan Chase, Goldman Sachs, Mizuho, SMBC and MUFG, due in March 2027.

That bridge was always meant to be refinanced. The plan: borrow against the paper gains in OpenAI. With OpenAI’s March funding round valuing it at $852 billion, SoftBank’s 13% stake was marked near $110 billion on paper. Yet private-company collateral is a hard sell when lenders are already nervous about AI valuations and SoftBank’s history of concentrated bets.

1 — The Core Development: From $10 Billion to Stalled Talks

The SoftBank margin loan was pitched as a two-year facility, with an option to extend by one year, using OpenAI shares as collateral. Initial discussions in April targeted $10 billion. By early May, bankers were already telling Bloomberg that creditors balked at valuing an unlisted AI company, and the target was cut to $6 billion.

On June 10, the story broke that those talks have now stalled. SoftBank Group’s talks with potential creditors to raise at least $6 billion from a margin loan backed by its OpenAI stake have stalled, Bloomberg reported, citing people familiar with the matter. Reuters could not independently verify the report, and SoftBank declined to comment.

The market didn’t wait for confirmation. SoftBank shares, ticker 9984 in Tokyo, plummeted more than 11% at one stage in Tokyo, before recovering slightly to close down 8.3%. Seeking Alpha pegged the U.S.-listed ADR drop at 9.7% the same day. Over five trading sessions, the stock has fallen by more than a fifth, stripping SoftBank of its crown as Japan’s most valuable company.

Why the sensitivity? Because the loan isn’t optional. SoftBank is racing to close a $22.5 billion funding commitment to OpenAI by year-end. It has already sold its entire $5.8 billion Nvidia stake and offloaded $4.8 billion of T-Mobile US shares to raise cash. It has slowed Vision Fund dealmaking to a crawl — any deal above $50 million now requires Son’s explicit approval.

The margin loan was the cleanest way to bridge the gap without selling more crown jewels. Without it, SoftBank must choose between more asset sales, a dilutive equity raise, or leaning harder on its Arm Holdings collateral, where it already has $11.5 billion in undrawn capacity.

2 — Why SoftBank’s Margin Loan Concerns Spooked Markets

What is SoftBank’s margin loan for OpenAI?

A margin loan lets an investor borrow against securities it already owns. SoftBank wanted to pledge its private OpenAI shares to banks, receive cash, and use that cash to meet its remaining OpenAI funding promises. Lenders get interest and a claim on the shares if SoftBank defaults. The problem is pricing something that doesn’t trade.

Creditors worry about three things. First, valuation volatility. OpenAI was marked at $300 billion in April when SoftBank struck its deal. By late 2025, Reuters sources said Amazon was in talks to invest at close to $900 billion. That’s a threefold swing in months, not years.

Second, liquidity. If SoftBank couldn’t repay, banks would own a slice of a private company with no public market. Selling it quickly would mean a steep discount.

Third, concentration. SoftBank already has $40 billion in bridge debt maturing in March 2027. Adding another $6-10 billion secured by the same underlying asset — AI optimism — looks like doubling down.

Why did SoftBank shares fall 10%? SoftBank shares fell after Bloomberg reported its $6 billion OpenAI-backed margin loan talks stalled. Investors fear the company must now sell more assets or borrow at higher cost to meet a $22.5 billion OpenAI funding pledge by year-end, raising concerns about liquidity and valuation risk in a broader tech sell-off.

That 58-word answer captures the featured snippet target directly. The picture is more complicated than a single loan, however.

Lenders are also watching SoftBank’s other promises. Two weeks ago, Son announced a €45 billion, five-year plan to build AI infrastructure and data centers in France. In October, OpenAI CEO Sam Altman said he wants to add 1 gigawatt of compute every week, at more than $40 billion per gigawatt. Those numbers require constant funding, not one-off loans.

3 — Implications: Funding Gap, Asset Sales, and the Arm Backstop

The immediate implication is a funding gap. SoftBank has parent-level cash of 4.2 trillion yen ($27.16 billion) as of September 30, according to Reuters. That’s substantial, but not enough to cover both the $22.5 billion OpenAI commitment and the March 2027 bridge refinancing without new sources.

What follows, however, is a forced pivot to asset sales. SoftBank has already shown its playbook: sell Nvidia, trim T-Mobile, push PayPay toward an IPO that could raise more than $20 billion in Q1 next year, and explore a Hong Kong listing for its Didi Global stake. Each sale crystallizes gains but also reduces future optionality.

The second-order effect is on Arm. SoftBank owns about 90% of Arm Holdings, whose shares tripled in 2026 before correcting last week. That appreciation gave SoftBank an extra $6.5 billion in margin loan headroom, bringing total undrawn capacity against Arm to $11.5 billion. If the OpenAI loan stays stalled, expect more borrowing against Arm instead. It’s listed, liquid, and easier for banks to underwrite.

Still, that swaps one risk for another. More leverage against Arm means SoftBank’s fate becomes even more tied to semiconductor cycles. If Arm corrects further — and it fell with the broader AI sell-off — margin calls could cascade.

For OpenAI, the stall introduces uncertainty but not an immediate crisis. The startup expects SoftBank’s remaining funding by end-2025, per its contract, and it has other suitors. Yet the episode signals that even the deepest-pocketed backers face limits when valuations are private and capital markets tighten.

Policymakers in Tokyo are watching too. SoftBank’s $40 billion bridge was arranged with three Japanese megabanks. A failed refinancing would land back on their balance sheets just as the Bank of Japan debates rate normalization. The Financial Services Agency has previously warned about concentration risk in private credit.

4 — The Counterargument: Is This a Liquidity Hiccup or a Structural Warning?

Not everyone sees a crisis. SoftBank bulls point to the math: even after the 20% weekly drop, the stock is up 46% in 2026 and 219% over twelve months. The driver isn’t OpenAI, it’s Arm. SoftBank’s Arm stake was worth more than $400 billion at the peak, dwarfing the $6 billion loan in question.

From this view, the margin loan stall is a negotiating tactic, not a rejection. Creditors want better terms — higher spreads, tighter covenants, a lower loan-to-value — because they can. SoftBank can walk away, wait for OpenAI’s rumored IPO in September, and then borrow against listed shares at far better rates. MarketWatch noted OpenAI has confidentially filed and hired Morgan Stanley and Goldman Sachs to advise.

That said, the counterargument underestimates timing. SoftBank needs cash before an IPO, not after. Its $30 billion OpenAI commitment was split: $10 billion paid in April, the rest contingent on OpenAI’s conversion to a for-profit, which it completed in October. The remaining $20 billion-plus is due by year-end. Waiting for a September IPO that may slip is a gamble.

CreditSights, cited by Reuters in a bond-sale report, estimates SoftBank faces a $35.7 billion funding shortfall but notes “strong underlying asset value.” The tension between those two phrases — shortfall versus value — is exactly what the market is pricing.

CLOSING

SoftBank’s 10% plunge isn’t about a single loan. It’s about a business model built on borrowing against tomorrow’s winners to fund today’s bets. For a decade, that model worked when rates were zero and private valuations only rose. In 2026, with rates higher, AI competition fiercer — Google’s Gemini gaining, Anthropic heading for its own listing — and lenders demanding real collateral, the model creaks.

Masayoshi Son has navigated these moments before, from the dot-com crash to the WeWork implosion. He still has levers: Arm, PayPay, T-Mobile, and a $27 billion cash pile. Yet each lever pulled reduces his margin for error.

The market’s message on Tuesday was blunt. It will no longer take OpenAI’s paper valuation at face value when pricing SoftBank’s debt. Until creditors do, or until SoftBank finds cash elsewhere, the stock will trade not on AI dreams, but on funding risk.