SoftBank prices record $11.1B junk-bond sale to fund OpenAI stake
SoftBank Group priced about $11.1 billion of dollar- and euro-denominated senior notes—the world’s largest high-yield corporate bond sale on record—to fund the final $10 billion tranche of its OpenAI follow-on investment, expected to close Oct. 1, with dollar coupons as high as 9.75%.
AI-assisted · US Brief desk · Sources listed below
What happened
SoftBank Group has priced roughly $11.1 billion of dollar- and euro-denominated senior notes in what Reuters, citing LSEG data, called the world’s largest high-yield corporate bond sale on record—locking in steep coupons to fund the final $10 billion slice of its OpenAI follow-on investment.
What SoftBank announced: In a Sep 24 company release, SoftBank said the package equals about $11.1 billion, or ¥1,763.2 billion, consisting of $10 billion of USD notes and €1 billion of EUR notes. Dollar tranches are $1 billion at 8.625% due April 1, 2030 (3.5 years), $4.5 billion at 9.250% due April 1, 2032 (5.5 years), and $4.5 billion at 9.750% due April 1, 2034 (7.5 years). Euro tranches are €500 million at 7.125% due October 1, 2030 (four years) and €500 million at 8.000% due October 1, 2032 (six years). Notes are expected to be issued September 29, rated BB+ by S&P Global Ratings Japan and Fitch Ratings Japan, and listed on the Singapore Exchange.
Where the money goes: SoftBank said proceeds will fund the $10 billion payment for the third and final tranche of the $30 billion follow-on investments in OpenAI Group PBC agreed in February 2026—expected to close October 1, 2026—plus general corporate purposes. Concurrently, SoftBank expects to cancel the remaining $10 billion of undrawn capacity under a $40 billion bridge facility signed in March 2026. Reuters put SoftBank’s total OpenAI commitment at $64.6 billion and said the firm will own roughly 13% of OpenAI by next week.
What’s next
Whether the notes settle as scheduled around Sep 29; confirmation that the Oct 1 OpenAI tranche funds and that SoftBank cancels the remaining $10 billion bridge capacity; any further SoftBank asset sales or Arm/OpenAI-backed loans; CDS and secondary spreads after the bonds list in Singapore; and whether other AI-linked high-yield issuers can clear near SoftBank’s coupons. This page supersedes US Brief’s earlier fin-softbank and tech-softbank-debt items that covered pre-pricing indications of interest—those demand signals are now confirmed by SoftBank’s priced, record-sized sale.
More context
Why the coupons are so high: SoftBank has long been a junk-bond issuer, but Reuters noted that a $7.3 billion SoftBank sale in June 2021 yielded only 2.125% to 5.25%. Thursday’s 8.625%–9.75% dollar coupons sit in a market where Treasury yields themselves hit multi-decade highs and where SoftBank’s five-year credit-default-swap spread exceeded 400 basis points this week, versus about 280 in June, Reuters reported. The Japan Times and other market coverage framed the pricing as a steep cost of capital for Masayoshi Son’s AI push.
Record scale in a crowded AI debt wave: Reuters said the deal surpasses French telecom Numericable Group’s $10.9 billion issuance in 2014 as the largest high-yield corporate bond sale globally to date. SoftBank has already issued $14.6 billion in high-yield bonds so far in 2026—63.4% of the Asia-Pacific and Japan high-yield corporate market, per Reuters/LSEG. Separately, LSEG data cited by Reuters show hyperscaler bond sales have more than doubled this year to over $200 billion, with analysts expecting more—competition for capital that itself has helped lift global borrowing costs.
Balance-sheet concentration and IPO delays: SoftBank is also acquiring ABB’s robotics business for $5.4 billion and DigitalBridge for $3.1 billion, Reuters reported, while selling assets and taking loans backed by Arm and OpenAI stakes. Hopes for cash from public listings of OpenAI and data-center unit SB Energy were dented when both delayed IPOs once expected as early as this month, Reuters said. CreditSights’ Mark Chapman wrote that SoftBank credit risks “are material and have increased as concentration has increased and cash flow has come under material strain,” estimating Arm and OpenAI make up three-quarters of group asset value. S&P’s Makiko Yoshimura countered that Arm’s strong share price supports credit quality such that an OpenAI IPO delay need not have an immediate negative impact; Chapman still sees upgrade potential if an OpenAI IPO is “timely and successful.”
Who is affected: SoftBank equity and credit investors absorbing larger leverage at higher coupons; OpenAI, which is set to receive the final $10 billion follow-on tranche around Oct. 1; other AI-adjacent junk borrowers watching whether SoftBank’s clearing levels become a new reference; and global rates markets already stressed by hyperscaler supply and rising sovereign yields. Tokyo equity holders saw a volatile reopen after a three-day holiday—CNBC reported SoftBank shares jumped more than 7%, while Reuters said the stock ended Thursday up 0.6%.
Uncertainty and competing views: Optimists, including Fitch’s Satoru Aoyama, said they were “positively surprised by the market appetite” and noted that AI-driven debt has now reached the high-yield market at scale after investment-grade hyperscalers led the wave. Skeptics argue rising risk-free yields, CDS widening, and OpenAI/SB Energy IPO delays leave SoftBank exposed if AI monetization or listings disappoint. US Brief does not treat either SoftBank’s credit outlook or OpenAI’s private valuation as settled facts beyond what SoftBank and cited wires disclose.
4 listed sources
- SoftBank Group Corp. press release, Sep 24, 2026 — ~$11.1B / ¥1,763.2B equivalent foreign-currency senior notes; USD $1B 8.625% due Apr 1, 2030 (3.5y), $4.5B 9.250% due Apr 1, 2032 (5.5y), $4.5B 9.750% due Apr 1, 2034 (7.5y); EUR €500M 7.125% due Oct 1, 2030 (4y), €500M 8.000% due Oct 1, 2032 (6y); BB+ (S&P Japan / Fitch Japan); Singapore Exchange listing; expected issue Sep 29, 2026; proceeds for USD 10B third/final OpenAI follow-on tranche (expected close Oct 1, 2026) and general corporate purposes; cancel remaining USD 10B undrawn of USD 40B March 2026 bridge
- Reuters (Anton Bridge; additional reporting Yoruk Bahceli), Sep 24, 2026 — largest high-yield corporate bond sale globally on record (surpassing Numericable’s $10.9B in 2014 per LSEG); SoftBank $14.6B HY issuance YTD = 63.4% of Asia-Pacific/Japan HY; OpenAI commitment $64.6B / ~13% by next week; ABB robotics $5.4B and DigitalBridge $3.1B deals; June 2021 SoftBank bonds yielded 2.125%–5.25%; hyperscaler bond sales >$200B YTD (LSEG); 5y CDS >400 bps vs ~280 in June; Fitch’s Satoru Aoyama appetite comment; CreditSights’ Mark Chapman concentration/cash-flow warning; S&P’s Makiko Yoshimura Arm-support note; shares +0.6% Thursday close after holiday closure
- CNBC, Sep 24, 2026 — SoftBank shares jumped more than 7% Thursday as Japanese markets reopened after a three-day holiday; $10B USD + €1B notes to fund final OpenAI tranche of $30B follow-on; cumulative OpenAI investment $64.6B
- Prior US Brief (fin-softbank; SoftBank’s OpenAI-linked junk debt draws heavy demand), Sep 23–24, 2026 — pre-pricing IOI/demand color now superseded by SoftBank’s priced terms
References listed by US Brief; a source count is not a verification score.
Editorial sourcing notes
Deal size, tranche coupons, ratings, expected Sep 29 issue date, Oct 1 OpenAI tranche close, and bridge-facility cancellation follow SoftBank Group’s Sep 24, 2026 press release. Record high-yield ranking, $64.6B OpenAI commitment/~13% ownership, CDS >400 bps vs ~280 in June, hyperscaler issuance context, and Fitch/CreditSights/S&P analyst color follow Reuters (Anton Bridge). Equity reaction: CNBC reported a >7% jump as Tokyo reopened after holidays; Reuters separately said SoftBank shares ended Thursday up 0.6%—treat as attributed prints, not a single reconciled close. This advances US Brief’s earlier fin-softbank/SoftBank’s OpenAI-linked junk debt draws heavy demand IOI coverage into the priced record sale.
Like US Brief? You can support it with a tip.