SoftBank Eyes Up to $20 Billion Offshore Bond Sale to Refinance Its OpenAI Bet

One day after news broke of its record ¥1 trillion retail bond in Japan, SoftBank Group Corp. is already working on something far bigger. According to a Bloomberg report published August 26, 2026, the Japanese conglomerate is in talks with investment banks about a potential $10 billion to $20 billion offshore bond offering — denominated in both dollars and euros — that could land as early as September.

The proceeds would partly repay the $40 billion bridge loan SoftBank secured earlier this year to fund its investment in OpenAI. If the deal hits the upper end of that range, it would be the largest bond sale by any Asian company in 2026 — and it would confirm, in the most literal sense, that the bill for the AI buildout is now being passed to global credit investors.

The details

Citing people familiar with the matter, Bloomberg reports that the offering could be denominated in dollars and euros, with talks ongoing and details subject to change. A SoftBank spokesperson offered a carefully hedged confirmation: “We are considering various options to refinance the bridge loan, but nothing has been decided, including the amount for each.”

Two structural details stand out. First, SoftBank is exploring a 144A format for the first time in more than a decade — a structure that allows notes to be sold directly to institutional investors in the United States, opening a far deeper pool of capital than its usual offshore deals. Second, this would be SoftBank’s second trip to the offshore bond market this year: in April it sold a combined $3.6 billion in dollar- and euro-denominated bonds, including a 10-year dollar tranche that carried a record 8.5% coupon. Yields on those dollar notes were trading around the same level this week.

That 8.5% figure is the number that should make investors pause. SoftBank is junk-rated, and refinancing a $40 billion bridge facility with debt costing 8.5% means the company is paying roughly $3.4 billion a year in interest for every $40 billion rolled — before a single dollar of return materializes from the AI stakes it is financing.

The financing pyramid around OpenAI

To understand why SoftBank needs this money, follow the commitments. In February 2026, OpenAI announced $110 billion in new investment at a $730 billion pre-money valuation, with $30 billion from SoftBank. SoftBank’s own disclosures show it had invested an aggregate $34.6 billion in OpenAI through Vision Fund 2 as of February, and it has committed to raising that total to roughly $64.6 billion — deploying $10 billion tranches in April and July, with more scheduled through October. The company is slated to invest close to $65 billion in OpenAI by October, funded increasingly by loans rather than asset sales.

The financing stack is elaborate. SoftBank liquidated its entire $5.8 billion Nvidia stake and other positions to redirect capital. In June it tried to borrow $6 billion against its OpenAI stake and watched its shares fall 9% on the news. In July it renewed talks for a $10 billion margin loan backed by that stake, adding concessions to get lenders comfortable. On August 6, the deal finally closed — arranged by Goldman Sachs and JPMorgan at a reported 7.88% interest rate, nearly triple what a margin loan against publicly traded stock would cost, with covenants that may require SoftBank to post cash or repay early if the private valuation moves against it. Even at a conservative 13% loan-to-value against OpenAI, the loan demonstrates both that the stake can support liquidity before an IPO — and how expensive that liquidity is.

Now add the domestic retail machine: the ¥1 trillion ($6.3 billion) retail bond announced this week, priced September 4 at an indicative 4.3–4.9% coupon, is SoftBank’s third retail sale of 2026. Japanese savers, dollar institutional investors, euro institutional investors, margin lenders — every channel is being tapped, simultaneously, for the same underlying bet.

The $410 billion question

SoftBank is not alone in turning to credit markets for AI. According to data compiled by Bloomberg, companies have borrowed more than $410 billion so far this year in bond markets alone for data centers and other AI investments. Some firms are even turning to junk-bond investors for AI-related funding that would qualify as investment-grade, simply because competition for capital has become that intense — and US tech firms are planning trillions more in AI infrastructure spending in the coming years.

This is the AI financing story of 2026 in miniature. Equity valuations — OpenAI at $730 billion, NVIDIA’s market cap, the Stargate joint venture’s $500 billion infrastructure plan — are underwritten by the assumption that compute begets capability begets revenue. But the buildout is being financed with debt priced today, and that debt has to be serviced regardless of when, or whether, the revenue arrives.

The irony is that the collateral backing much of this paper is itself an unrealized gain. SoftBank’s Vision Fund booked a $46 billion yearly gain in May, driven largely by the rising paper value of its OpenAI stake. Loans against that stake, bonds repaying loans against that stake — the whole structure works beautifully as long as the private valuation keeps climbing. A down round, a stalled IPO window, or a sovereign-wealth slowdown anywhere in the chain would force the same reckoning banks already signaled in June, when they balked at seven-year SoftBank debt.

What to watch

Three markers will tell us where this is going. The September pricing of the ¥1 trillion retail bond comes first, on September 4 — watch the final coupon. Second, whether the $10–20 billion offshore deal actually prices in September, and at what spread over the April tranche’s 8.5%. And third, October, when SoftBank’s cumulative OpenAI investment is slated to approach $65 billion — every dollar of it borrowed, sold, or pledged against a company that has yet to go public.

Masayoshi Son has staked the conglomerate’s future on superintelligence arriving before its creditors do. The offshore bond market is about to get its chance to price that belief.