# SoftBank Pays Its Highest Dollar Bond Yields to Fund a $10 Billion OpenAI Payment

The Japanese group raised roughly $11 billion in one of the largest high-yield offerings on record, with dollar tranches priced near 9 percent.

- Published: 2026-09-24T05:14:08.834Z
- Canonical: https://polylog.news/2026-09-24/softbank-pays-its-highest-dollar-bond-yields-to-fund-a-10-bi
- Publisher: Polylog (Global desk)
- Section: markets
- Sources: [The Japan Times](https://www.japantimes.co.jp/business/2026/09/24/companies/softbank-junk-bond-steep-price-pay/), [Financial Times](https://www.ft.com/content/2d87f8bf-d529-4997-90c5-393ef65d280c?syn-25a6b1a6=1), [CoinDesk](https://www.coindesk.com/markets/2026/09/24/dogecoin-down-8-bitcoin-under-usd84-000-as-treasury-yields-hit-highest-level-since-2007)

SoftBank Group sold more than 11 billion dollars of high-yield debt to finance its next payment to OpenAI, and committed to [the highest yields it has ever paid on dollar bonds](https://www.japantimes.co.jp/business/2026/09/24/companies/softbank-junk-bond-steep-price-pay/). The sale priced on a day when benchmark Treasury rates reached two-decade highs, a coincidence of timing that added directly to the cost.

The structure was 10 billion dollars of notes across 3.5-year, 5.5-year and 7.5-year maturities, plus 1 billion euros in four-year and six-year tranches. Demand exceeded [30 billion dollars of orders for the dollar tranches](https://www.ebc.com/forex/softbank-bond-sale-openai-30-billion-demand), letting SoftBank tighten pricing from initial guidance to final coupons of [8.625 percent, 9.25 percent and 9.75 percent](https://finance.yahoo.com/markets/stocks/articles/softbank-launches-11-billion-bond-sale-to-fund-openai-investment) on the three dollar tranches. Proceeds cover a 10 billion dollar payment for the third tranche of SoftBank's follow-on investment in OpenAI, expected to close on 1 October, with the bonds themselves set to settle on 29 September.

The transaction connects two of the market's active themes. The Financial Times described [a global bond sell-off deepening](https://www.ft.com/content/2d87f8bf-d529-4997-90c5-393ef65d280c?syn-25a6b1a6=1) as oil held above 100 dollars, and CoinDesk noted the [weak five-year Treasury auction](https://www.coindesk.com/markets/2026/09/24/dogecoin-down-8-bitcoin-under-usd84-000-as-treasury-yields-hit-highest-level-since-2007) that pushed yields up further. Corporate borrowing to fund artificial-intelligence capital spending is itself one of the forces adding supply to credit markets, so the sector is helping to raise the rate at which it must borrow. At its finalised size, the sale stands as the largest high-yield bond offering on record by an Asia-Pacific or Japanese issuer, [surpassing SoftBank's own 7.35 billion dollar deal from 2021](https://finance.yahoo.com/markets/stocks/articles/softbank-draws-over-20-billion-084641856.html).

This is what capital rationing looks like when the price of capital is allowed to rise. A company converting debt at yields approaching 9 percent into an equity stake in a private company is making an explicit bet that the returns on artificial-intelligence infrastructure will exceed that hurdle within the life of the bonds. Investors bought the paper in scale well beyond what SoftBank offered, so the market is willing to fund the bet. It is charging a great deal more than it did two years ago to do so.

## What this means

SoftBank's cost of funds sets a visible benchmark for the price of debt-financed artificial-intelligence investment. At roughly 9 percent, the required return on that spending rises, which narrows the set of projects that clear. Holders of high-yield credit gain income but take concentrated exposure to a single technology cycle, since one borrower now accounts for an unusually large share of the market. If artificial-intelligence revenue disappoints, the repricing arrives in the credit market first, through spreads, before it reaches equity valuations.

## What to watch

- Where the new SoftBank bonds trade in the secondary market, because a fall below issue price would signal the deal cleared only by paying up.
- Whether other large technology borrowers follow with debt-funded artificial-intelligence commitments at similar yields, which would confirm that the sector's capital spending now depends on the high-yield market.
- Confirmation that the third OpenAI tranche closes on 1 October as scheduled.