SoftBank Shares Crash 11% as Cost of Insuring Its Debt Hits a Four-Year High
SoftBank Group, the Japanese technology investor behind some of the biggest bets in artificial intelligence, had a brutal day on the stock market on Friday, 6 November 2026. Its shares fell 11 percent in Tokyo, and the cost of insuring its debt against default jumped to its highest level in four years.
The sell-off shows how quickly the mood around AI has changed. Only weeks ago, SoftBank was one of the great winners of the AI boom. Now investors are asking a harder question: when will all this spending on AI actually turn into cash?
This article explains what happened to SoftBank, what a credit default swap is, why investors are worried, and whether the company is really in trouble.
What happened on Friday
SoftBank’s shares dropped 11 percent on Friday in Tokyo, closing down 10.8 percent on the day. The fall extended a slide that has now wiped out almost half of the company’s value since the start of September.
At the same time, the bond market flashed a separate warning. The five-year credit default swap (CDS) spread for SoftBank — the cost of insuring its debt against default — rose to as much as 466 basis points, according to Markit data cited by Reuters. That was the widest level since October 2022. It later eased slightly to 457.5 basis points.
The numbers tell a simple story: investors are demanding much more money to take on the risk of lending to SoftBank than they were a few weeks ago.
The selling was part of a wider rout in AI-related stocks. Samsung and SK Hynix plunged in South Korea, Taiwan’s stock market suffered a record fall, and Wall Street had already seen trillions of dollars wiped off global shares as doubts about AI spending spread. SoftBank, as one of the most aggressive AI investors in the world, was caught in the middle of it.
What is a credit default swap — and why does 466 matter?
A credit default swap, or CDS, is a kind of insurance against a borrower failing to pay its debts. A lender buys a CDS contract and pays a regular fee. If the borrower defaults, the contract pays out.
The “spread” is the yearly cost of that insurance, measured in basis points. One basis point is one-hundredth of a percent. A spread of 466 basis points means it costs about 4.66 percent of the insured amount every year to protect against a SoftBank default.
A higher spread means the market thinks the risk of default has gone up, or at least that lenders want more compensation for taking the risk. A lower spread means confidence is high.
Two things are important to understand about the 466 figure:
First, it is not a prediction that SoftBank will go bankrupt. Markit data put the implied probability of default at 30.6 percent. That is a figure produced by a pricing model, not a forecast that the company will fail. It depends on assumptions, including how much lenders would recover if a default happened, and it includes extra premiums for risk and market conditions.
Second, a CDS spread can move fast on fear alone. When markets panic, the cost of insurance jumps even for companies that are still paying their debts on time. There is no sign that SoftBank has missed a payment. The spread is a warning light, not a verdict.
Why investors are worried about SoftBank
SoftBank is seen as a bellwether for the whole AI investment boom. Its fortunes are tied to three big bets, and all three are now under question.
The 64.6 billion dollar OpenAI bet
SoftBank has invested about 64.6 billion dollars in OpenAI, the company behind ChatGPT. It is the largest single bet the Japanese group has ever made on one company.
The problem is timing. OpenAI has pushed back its planned stock market listing to 2027, delaying the day SoftBank might cash in on the investment. OpenAI did close 11 billion dollars in new funding this week at a valuation of 1.25 trillion dollars, which shows investors still believe in the company. But for SoftBank, the payoff keeps moving further away while the bills keep coming.
To fund the OpenAI stake, SoftBank has been issuing debt at unusually high yields. Investors have been looking more closely at its finances all year as its borrowing has grown.
Arm and the chip boom
SoftBank owns about 90 percent of Arm, the British chip designer whose technology sits inside almost every smartphone in the world. Arm’s shares have also been hit by the AI sell-off, which weakens SoftBank’s balance sheet because its stake is worth less.
Data centres and the ABB deal
SoftBank is also financing data centre development through its subsidiary SB Energy, part of the huge infrastructure spending that AI requires. Building data centres is expensive, and the returns take years to arrive.
In a separate blow, China reportedly blocked SoftBank’s 5.4 billion dollar purchase of ABB’s robotics unit. The deal would have added a robotics business to SoftBank’s portfolio. Losing it removes one more source of future growth.
Elon Musk added to the noise on Friday by claiming on X that SoftBank was defaulting on its turbine orders. Neither SoftBank nor any turbine maker confirmed the claim, and Musk named no supplier or source. The claim was not confirmed by anyone involved.
The wider AI sell-off
SoftBank’s troubles did not happen in isolation. The whole AI trade has been wobbling since the US midterm elections, when Democrats won control of Congress and promised tighter rules for AI and data centres.
Investors who had poured money into AI shares for two years began to ask whether the spending would ever pay off. The doubts spread from shares to bonds. Global stocks have lost trillions of dollars in value in the sell-off, and chipmakers from Taiwan to South Korea have been hit hard.
SoftBank is especially exposed because it borrowed heavily to make its bets. When confidence falls, a company with a lot of debt feels the pain first — in its share price and in the cost of insuring its debt.
Is SoftBank actually in trouble?
A high CDS spread does not mean a company is about to fail. Several facts argue against panic.
First, SoftBank owns far more than it owes. According to the company’s own investor materials, at 30 June 2026 it held investment assets worth 83.11 trillion yen, against net debt of 10.81 trillion yen, leaving a net asset value of 72.30 trillion yen. Its loan-to-value ratio — debt compared with the value of its assets — was just 13 percent. Those are historical figures from June, and they do not show the full picture of cash and liabilities today, but they show the company is not short of assets.
Second, its biggest holdings are real businesses. Arm designs chips used around the world. OpenAI is the leading AI company, valued at 1.25 trillion dollars in its latest funding round. These are not worthless assets, even if their prices have fallen.
Third, a CDS spread of 466 basis points, while high, is a market price that can fall as quickly as it rose. If SoftBank’s results next week reassure investors, or if the AI sell-off calms down, the cost of insuring its debt could come down sharply.
The real test comes on Tuesday, 10 November 2026, when SoftBank reports its results for the second quarter of its 2026 financial year, covering the six months to 30 September. Investors will be watching its debt levels, its cash position and what its boss, Masayoshi Son, says about the OpenAI bet.
What happens next
Three things will decide whether Friday was a warning or the start of something worse:
- SoftBank’s results on 10 November. The numbers will show how much debt the company is carrying and how its investments are performing.
- OpenAI’s path to a listing. If the 2027 listing goes ahead as planned, it could unlock tens of billions of dollars for SoftBank. Any further delay would add to the pressure.
- The wider AI market. SoftBank’s shares and its CDS spread will move with the global mood on AI. If investors decide the AI boom is still real, the panic will fade. If the doubts deepen, the pressure on debt-heavy AI investors will grow.
For now, the message from the market is clear. Investors still believe AI will change the world. They are no longer sure it will make money fast enough to justify the borrowing that funded it — and SoftBank, the boldest borrower of them all, is where that doubt is showing up first.
Frequently asked questions
Why did SoftBank shares fall 11 percent?
SoftBank’s shares fell 11 percent in Tokyo on Friday, 6 November 2026, as worries about the profitability of AI investments spread through global markets. The shares have now lost almost half their value since the start of September.
What is a credit default swap?
A credit default swap (CDS) is a contract that insures against a borrower failing to pay its debts. The buyer pays a regular fee, and the contract pays out if the borrower defaults. The spread is the yearly cost of that insurance.
What does a 466 basis point CDS spread mean?
SoftBank’s five-year CDS spread rose to 466 basis points, the widest since October 2022. That means it costs about 4.66 percent of the insured amount per year to protect against a SoftBank default. Markit data put the implied default probability at 30.6 percent, but that is a modelled figure, not a forecast that the company will fail.
How much has SoftBank invested in OpenAI?
SoftBank has invested about 64.6 billion dollars in OpenAI. It also owns about 90 percent of chip designer Arm and finances data centre development through its subsidiary SB Energy.
Has SoftBank defaulted on any debt?
No. There is no sign SoftBank has missed a debt payment. The rising CDS spread shows investors want more compensation for the risk of lending to the company, not that a default has happened. A claim by Elon Musk that SoftBank was defaulting on turbine orders was not confirmed by SoftBank or any supplier.
When does SoftBank report its results?
SoftBank is scheduled to report results for the second quarter of its 2026 financial year on Tuesday, 10 November 2026, covering the six months ended 30 September 2026.
Conclusion
Friday was a bad day for SoftBank, and the numbers explain why investors are nervous. Its shares fell 11 percent, it has lost almost half its value since September, and the cost of insuring its debt hit a four-year high as its 64.6 billion dollar bet on OpenAI waits for a payoff that has now been pushed to 2027.
But a high CDS spread is a warning, not a death sentence. SoftBank still owns valuable assets, including its Arm stake and its OpenAI holding, and its debt is small compared with the value of what it owns. The company’s results on 10 November will show whether the market’s fear is justified — or whether, like other panics before it, this one passes.
Sources
- Reuters, “SoftBank credit risk jumps to 4-year high, shares tumble as AI fears roil market” (6 November 2026): https://985theriver.com/2026/11/05/softbank-credit-risk-jumps-to-4-year-high-as-ai-fears-roil-market/
- Reuters via SRN News, “SoftBank credit risk jumps to 4-year high as AI fears roil market” (6 November 2026): https://srnnews.com/softbank-credit-risk-jumps-to-4-year-high-as-ai-fears-roil-market/
- BusinessToday, “SoftBank Credit Risk Hits Four-Year High As AI Profitability Concerns Deepen” (6 November 2026): https://www.businesstoday.com.my/2026/11/06/softbank-credit-risk-hits-four-year-high-as-ai-profitability-concerns-deepen/
- Finimize, “SoftBank’s AI Bet Hit A New Stress Test” (6 November 2026): https://finimize.com/content/softbanks-default-insurance-cost-hit-a-four-year-high
- Poland Insight, “SoftBank Shares Fall 10.8% as AI Financing Risk Rises” (6 November 2026): https://polandinsight.com/softbank-ai-financing-risk-cds-26395/
This article is for general information and education only. It is not legal or financial advice.
