Reported 23 Sept 2026 Capital

SoftBank borrowed 11.1 billion dollars to pay OpenAI, at the highest interest rate it has ever paid.

On September 23 SoftBank priced 11.1 billion dollars of bonds in dollars and euros to fund its equity commitment to OpenAI, the largest high yield bond sale on record by an Asia-Pacific issuer, with coupons running from 8.625 percent on the shortest dollar tranche to 9.75 percent on the longest. Order books passed 20 billion dollars, so the demand was there, and the yields are still records for the company.

The caveat that matters is that SoftBank has published nothing itself: every term here comes from the deal's term sheet as reported, and the money is not committed until the notes settle on September 29.

Until now

Edition 028 carded SoftBank borrowing more than 11 billion dollars at junk ratings to make its next OpenAI payment. The size was marketed, the cost was not established, and the fuse asked what yield the market would demand.

Now

Treat 9.75 percent for seven and a half years as the published cost of lending against an OpenAI payment, and read every later financing in this chain against that number.

The size was already carded. On September 21 this brief recorded SoftBank marketing more than 11 billion dollars of junk-rated notes to fund its next payment to OpenAI, and the open question was what the market would charge. The answer is 8.625 percent for three and a half years, 9.25 for five and a half, and 9.75 for seven and a half, with euro money at 7.125 and 8 percent. Demand was not the problem: more than 20 billion dollars of orders came in against 11.1 billion of paper, and the deal priced inside its own talk, meaning lenders accepted less than the banks first floated. Both things are true at once. The book was twice covered, and the coupons are the highest the company has ever paid.

What makes the number matter is what sits underneath it. SoftBank is not borrowing to build anything; it is borrowing to hand equity money to a private company, 10 billion dollars of it due on October 1, against a commitment reported at 65 billion. The lenders are being asked to take a seven and a half year view on a payment schedule whose other end is a company that does not publish accounts. The market's answer is that this costs 9.75 percent, roughly double what a large Japanese conglomerate paid for long money a year ago, and the insurance on SoftBank's debt has moved the same way, from about 200 basis points in October 2025 to above 400 now. Treat 9.75 percent for seven and a half years as the published cost of lending against an OpenAI payment, and read every later financing in this chain against that number.

How it got here

Sep 21
SoftBank launches more than 11 billion dollars of junk-rated notes to fund its next OpenAI payment. Carded in Edition 028 as Reported.
Sep 23
Books pass 20 billion dollars; the deal prices at 11.1 billion with coupons of 8.625, 9.25 and 9.75 percent in dollars and 7.125 and 8 percent in euros.
Sep 23
The five-year credit default swap spread on SoftBank passes 400 basis points, against about 280 in June.
Sep 29
Settlement due, two days before the 10 billion dollar OpenAI instalment the proceeds are raised against.
Who has to react
OpenAI, whose funding now has a published interest rate attached to it that anyone can quote; every other borrower financing AI commitments, from neoclouds to data centre developers, who will be shown this curve by their own banks; SoftBank shareholders, who watched the insurance cost on the company's debt double in a year; the rating agencies at S&P and Fitch, who have BB+ on a balance sheet adding 15 billion dollars of bonds in nine months; Japanese institutional buyers, who took 500 million euros of this at 7.125 percent; and the short sellers who have been pricing the gap between SoftBank's borrowing cost and the returns it is borrowing to chase.

The evidence

Reported. The tranche sizes, maturities and coupons come from the transaction's term sheet as carried by Reuters and corroborated by Bloomberg and the Seoul Economic Daily; SoftBank Group's own press release page listed nothing later than September 9 when we read it this morning, so no issuer document has been seen and no prospectus has been located. Verification event: settlement on September 29, 2026, at these sizes and coupons, which is already the dated fuse standing on Edition 028's card. Until then the terms are treated as reported and the deal as unsettled.

ObservedWednesday September 23, 2026. SoftBank Group priced 11.1 billion dollars of senior notes across dollars and euros, described in the reporting as the largest high yield bond sale on record by an Asia-Pacific issuer.

The whole observation, as recorded

Three dollar tranches: 1 billion dollars at three and a half years with a coupon of 8.625 percent, 4.5 billion at five and a half years at 9.25 percent, and 4.5 billion at seven and a half years at 9.75 percent. Two euro tranches of 500 million euros each: four years at 7.125 percent and six years at 8 percent. Order books passed 20 billion dollars during bookbuilding. Initial price talk was above where the deal landed, 8.75 to 8.875 percent on the shortest dollar tranche and 9.75 to 9.875 on the longest, which is where the record-yield figures carried in the day's coverage came from; the deal priced inside its own talk. S&P Global and Fitch both rate SoftBank BB+, the highest speculative grade rung. Stated use of proceeds: SoftBank's equity commitment to OpenAI, reported at 65 billion dollars, and merger and acquisition activity. SoftBank has now issued close to 15 billion dollars of bonds this year and is the largest speculative grade issuer in the market. Its five-year credit default swap spread passed 400 basis points this week, against about 280 basis points in June and about 200 in October 2025, so the cost of insuring its debt has roughly doubled in a year. Settlement is due September 29, two days before the 10 billion dollar OpenAI instalment the money exists to fund. Edition 028 carded this deal on September 21 at launch, when the size was marketed and the price was not known. The price is now known.

Established

SoftBank priced 11.1 billion dollars of senior notes on September 23, 2026, in three dollar tranches and two euro tranches.
The coupons are 8.625, 9.25 and 9.75 percent in dollars and 7.125 and 8 percent in euros, and order books passed 20 billion dollars.
The stated use of proceeds is SoftBank's equity commitment to OpenAI, reported at 65 billion dollars, and merger and acquisition activity.
SoftBank's five-year credit default swap spread passed 400 basis points this week, against about 280 in June and about 200 in October 2025.

Not established

That the money has moved. The notes settle on September 29 and nothing is paid to anyone before that; a deal can be pulled between pricing and settlement.
That these are the terms SoftBank filed. No issuer announcement or prospectus has been seen; the terms come from the deal's term sheet as reported by Reuters.
That the market doubts OpenAI. A BB+ borrower pays BB+ prices, and SoftBank's spread reflects SoftBank's whole balance sheet, including a debt load that has nothing to do with OpenAI.
That 65 billion dollars is committed on published terms. The figure is reported and the payment schedule behind it has never been published by either party.

Why it weighs this much

Signal strength

CostHigh

CommitmentHigh

ReversibilityIrreversible

PersistenceYears

Cost is high and unambiguous, because the cost is the action: at these coupons SoftBank has contracted to pay roughly one billion dollars a year in interest on this issue alone, for as long as seven and a half years. Commitment is high because a priced bond with a signed term sheet is not a plan, it is a schedule of payments. Reversibility is irreversible once the notes settle, which is the one qualification on this card and the reason it is Reported rather than verified until September 29; a deal can still be pulled between pricing and settlement, though it very rarely is. Persistence is years by the maturities themselves, and the seven and a half year tranche outlives most of the assumptions being made about AI returns today.

What to watch

strengthens Another AI-linked borrower prices high yield debt at a wider spread to benchmarks than its own previous issue, or a data centre or neocloud deal is pulled on price, by December 31, 2026.
weakens SoftBank's five-year credit default swap spread returns below 300 basis points, or the company issues again inside these levels, by December 31, 2026.

The words

High yield bond: A bond from a borrower rated below investment grade, which pays more because the lender is taking more risk. Also called a junk bond. SoftBank is rated BB+, the top rung of that category.
Coupon: The fixed annual interest the borrower pays, as a percentage of the amount borrowed. A 9.75 percent coupon on 4.5 billion dollars is about 439 million dollars a year for seven and a half years.
Credit default swap spread: The annual cost of insuring against a borrower defaulting, quoted in basis points, where 100 basis points is one percent. SoftBank's has gone from about 200 to above 400 in under a year.
Initial price talk: The yield range a bank floats to test demand before a bond is priced. Pricing inside the talk, as here, means demand was strong enough to lower the cost.

Your call

If the notes settle at these terms, which explanation do you believe?

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