- SoftBank closed an upsized $11.87 billion two-year loan from about 20 banks, raised from an initial $10 billion target, to help fund its OpenAI investment.
- The loan pushes SoftBank's OpenAI commitment toward $65 billion by October, of which roughly $37 billion is already raised through offshore and domestic bonds and other loans.
- SoftBank shares fell as much as 13 percent on September 14, the steepest single-day drop since July 17, as investors weighed the leverage behind the bet.
SoftBank upsizes an OpenAI loan to $11.87 billion
SoftBank sealed a syndicated loan of $11.87 billion, larger than the $10 billion it originally sought, with roughly 20 banks joining the two-year facility, according to Bloomberg. The financing is one piece of a funding push that Masayoshi Son has assembled to meet a commitment to OpenAI that is now approaching $65 billion, the largest single wager of SoftBank's history and one of the largest private technology bets on record.
| $11.87B | Upsized two-year loan, raised from a $10B target |
| ~20 banks | Lenders in the syndicated facility |
| ~$65B | Total OpenAI commitment SoftBank is funding by October |
| ~$37B | Already raised toward it through bonds and loans |
| 13% | Intraday fall in SoftBank shares on September 14, the worst since July 17 |
Masayoshi Son is financing the OpenAI stake with debt, not cash
The structure matters as much as the size. SoftBank is funding the OpenAI position through a stack of borrowings rather than from cash on hand, layering bond sales and secured loans on top of one another to reach the target. The pieces disclosed so far describe a company leaning heavily on leverage to buy into a single asset.
| Instrument | Size | Structure and status |
|---|---|---|
| New syndicated loan | $11.87B | Two-year facility, ~20 banks, closed September 2026 |
| Margin loan | $10B | Backed by SoftBank's OpenAI stake |
| Junk bond sale | up to $20B | In progress |
| Earlier bridge loan | $40B | Obtained earlier in 2026, $25.9B balance due September 15 |
This is the same playbook Son ran with the Vision Fund, concentrated into one name. Where the Vision Fund spread borrowed capital across dozens of startups, the OpenAI commitment routes the leverage into a single company that does not expect to turn a profit for years and that has now ruled out a near-term public listing. Sam Altman closed the exit himself this month.
I actually think that, given everything happening with safety, right now would be an ill-advised moment to go public. I would say not 2026.Sam Altman, OpenAI CEO, Fortune interview, September 12, 2026
Altman's comment removes the cleanest path SoftBank had to mark and monetize the stake, which makes the debt behind it heavier rather than lighter. The broader financing wave sits alongside the $35 billion compute commitment Anthropic struck with Lambda, a sign that the capital intensity of frontier AI infrastructure is now measured in tens of billions per relationship.
A 13 percent share drop shows the market pricing the leverage
Investors reacted immediately. SoftBank stock fell as much as 13 percent on September 14, its worst session since July 17, even though the loan itself was a success by its own terms, oversubscribed and upsized. The market read the enlarged facility as confirmation of how much debt now stands behind the OpenAI position, and how exposed SoftBank's balance sheet has become to the fortunes of one private company.
The sell-off captures the central risk of the circular financing that now defines the AI build-out. SoftBank borrows to fund OpenAI, OpenAI commits that capital to compute providers, and those providers borrow against future AI demand to build the data centers. Each link is rational on its own, and the chain concentrates risk in a small number of names whose valuations depend on continued frontier progress. A durable slowdown in that progress would strain every link at once.
The repayment most coverage skipped: $25.9 billion due September 15
The number that frames the new loan is the one due the day after it was reported. SoftBank is repaying a $40 billion bridge loan taken earlier in the year, with a $25.9 billion balance falling due on September 15. The fresh $11.87 billion facility is not simply new firepower for OpenAI, it is part of the refinancing machinery that keeps an already heavy debt load rolling forward. Read against that repayment, the upsized loan looks less like expansion and more like the cost of staying in the position.
SoftBank's OpenAI bet may still prove to be the defining investment of the AI era. What this week established is the price of holding it: roughly $65 billion committed, most of it borrowed, refinanced on two-year cycles, and marked to a company that will not go public while the debt behind it is denominated in tens of billions and repriced every time the market questions the pace of AI itself.
Loan terms, the financing stack, and the share reaction are drawn from Bloomberg and Japan Times reporting on SoftBank's September 2026 filings. Sam Altman's remarks are quoted verbatim from his September 12, 2026 interview with Fortune. Figures are as reported at publication and may be revised as SoftBank completes the remaining tranches.
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