Junk bond buyers just bankrolled SoftBank's last $10 billion payment to OpenAI
Five tranches of BB+ senior notes, disclosed 24 September with an expected issue date of 29 September, fund the third and final $10 billion installment of SoftBank's $30 billion OpenAI commitment. The coupon is contractual; the equity it buys owes nothing on any schedule.
Vincent Jiang · 3 min read
SoftBank Group's new senior notes carried an expected issue date of 29 September, and the $10 billion they raise is expected to close at OpenAI on 1 October, finishing a $30 billion commitment struck in February 1. Five tranches totalling about $11.1 billion, or 1,763.2 billion yen, priced in dollars and euros, every one of them rated BB+ by S&P Global Ratings Japan and Fitch Ratings Japan: below investment grade 1.
The scale the market swallowed
On LSEG data, it is the largest high-yield corporate bond sale on record, passing Numericable's $10.9 billion from 2014 2. SoftBank shares jumped more than 7 percent on the announcement 3. Completion lifts cumulative OpenAI investment to $64.6 billion, roughly 13 percent of the company 2.
The coupon is a clock; the stake has none
The dollar tranches are $1.0 billion at 8.625 percent due 2030, $4.5 billion at 9.250 percent due 2032 and $4.5 billion at 9.750 percent due 2034; the euro tranches are €500 million at 7.125 percent due 2030 and €500 million at 8.000 percent due 2032 1 4. The three dollar tranches sum to exactly $10,000 million, the precise payment the release names, a dollar-for-dollar match first flagged by FourWeekMBA 4.
On the disclosed coupons that leg carries a weighted average near 9.41 percent, about $941 million of interest a year, payable each April and October into 2034 1 4. The OpenAI stake those notes buy owes nothing on any schedule. That is the structure, not a forecast.
One BB+ issuer, five coupons: euro paper prices up to 1.5 points under dollars
Data
| Value | |
|---|---|
| €500M due 2030 | 7.13% |
| €500M due 2032 | 8% |
| $1.0B due 2030 | 8.63% |
| $4.5B due 2032 | 9.25% |
| $4.5B due 2034 | 9.75% |
The same credit prices cheaper in euros
At the 2030 maturity the same BB+ issuer pays 7.125 percent in euros against 8.625 percent in dollars, a 1.5-point gap; at 2032 it is 8.000 against 9.250 1. Currency and tenor set the price, not the rating.
Insuring SoftBank's five-year debt passed 400 basis points this week, up from about 280 in June, and CreditSights puts Arm plus OpenAI at three-quarters of group asset value 2. If the coupon outruns the stake, the loss lands on SoftBank's shareholders; the noteholders keep a fixed claim either way.
Financed twice over: on Arm, then the bond market
The OpenAI commitment is now financed twice over: loans backed by Arm and OpenAI holdings 2, including the roughly $25 billion margin facility against Arm shares that The Inference detailed on Tuesday 5, and now the bond market 1. SoftBank also expects to cancel the remaining $10 billion of its $40 billion March bridge facility 1.
The buyers showed up anyway
"I was positively surprised by the market appetite," said Fitch's Satoru Aoyama 2. S&P's Makiko Yoshimura wrote that Arm's strong share price means the delayed OpenAI IPO does not immediately damage SoftBank's creditworthiness 2. The demand is real, and so is the schedule attached to it.
What to watch
The OpenAI close lands 1 October 1. After that the coupon dates arrive twice a year while the equity answers to none. Noteholders bought a clock, and Masayoshi Son bought an option.
How this brief was made
01Gathered & sourced277 channels · 2,267 articles▾
Agents swept 277 channels and ingested 2,267 articles, then de-duplicated and ranked them for signal.
02Verified & cross-validated5 claims · 18 data feeds▾
Every one of 5 load-bearing claims was checked against primary sources, with 18 live data feeds reconciling the figures and charts.
- 1MarketScreener / S&P Capital IQ, repost of SoftBank Group Corp., Issuance of Foreign Currency-Denominated Senior Notes, 24 September 2026
- 2Reuters (Anton Bridge) via Gulf Times, SoftBank raises $11.1bn in world's biggest high-yield corporate bond sale, 24 September 2026
- 3Crypto Briefing, SoftBank raises $11.1B through massive bond sale to fund OpenAI investment, 24 September 2026
- 4FourWeekMBA, SoftBank's $11.1 Billion Notes Fund OpenAI's Final Tranche, 30 September 2026
- 5Yahoo Finance / Insider Monkey, SoftBank Is Raising $11 Billion for OpenAI. Its Arm Stake Backs a $25 Billion Loan Facility, 23 September 2026
03Reviewed & edited1 human editor▾
One editor read the draft against the evidence, tuned the framing, and signed off before it shipped.
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AI-generated from this story and its cited sources. Not investment advice.
