SoftBank Expands Arm-Backed Margin Loan to $25 Billion

SoftBank is building a larger pool of financing around its most valuable equity holdings as it pursues AI investments. The latest step is a reported $5 billion increase in its margin loan secured by Arm Holdings shares, bringing the facility to $25 billion. 17

That is not a $25 billion cheque earmarked for one acquisition or investment. It is a collateral-backed source of group liquidity that can support SoftBank’s broader funding needs. The trade-off is clear: more funding flexibility, but greater sensitivity to Arm’s share price and to the availability of refinancing when other AI-related commitments come due.

What changed with the Arm facility

SoftBank had arranged a $20 billion margin loan against its Arm stake by August 2026. 18 In September, it reportedly renegotiated the facility and signed an amendment with creditors that increased the amount to $25 billion. 17

The collateral is shares in Arm, SoftBank’s listed chip-design subsidiary. A margin loan is secured borrowing: lenders rely on the value of the pledged shares, rather than solely on the borrower’s general creditworthiness. If the collateral value falls enough relative to the amount borrowed, the borrower may need to add collateral, repay debt, or otherwise restore the agreed loan-to-value ratio.

The reporting on the $25 billion amendment confirms the increase and the Arm-share collateral, but it does not publicly establish the final pricing, maturity, drawdown level, lender roster, or the scale of lender demand. Those details should not be inferred from the headline facility size. 17

Why Arm-backed borrowing matters to SoftBank’s AI strategy

The expanded facility gives SoftBank another way to raise cash without immediately selling Arm shares or relying entirely on unsecured bonds. Reuters reported in August that investors were already questioning how SoftBank would fund its growing commitments, with about $30 billion of obligations due in the second half of 2026 and a $40 billion bridge loan scheduled to mature in March 2027. 18

Arm-backed debt is therefore part of a wider corporate financing stack, not project finance linked dollar-for-dollar to a particular AI transaction. Its role is to improve overall liquidity while SoftBank funds and refinances investments associated with OpenAI and its wider AI strategy.

The other major pieces of the funding stack

SoftBank has been actively replacing or supplementing bridge financing with several instruments:

• Repayment of the OpenAI bridge loan: SoftBank said it would repay the remaining $25.9 billion outstanding on a $40 billion loan used to finance its OpenAI investment. The repayment was part of a plan to refinance with longer-term debt. 3
• A $10 billion OpenAI-backed margin loan: In August, SoftBank agreed to a two-year facility collateralized by its OpenAI stake. Goldman Sachs Bank USA, JPMorgan Chase Bank, Mizuho Securities USA, Apollo Global Funding and Sumitomo Mitsui Banking Corp. were named as mandated lead arrangers. 4
• Additional bank borrowing: SoftBank later secured an $11.87 billion, two-year loan, above an earlier $10 billion target, with commitments from roughly 20 banks, according to people familiar with the matter. 8
• Potential bond financing: SoftBank has also discussed a potential $10 billion to $20 billion bond offering to refinance OpenAI-related borrowing. 19

Earlier attempts to borrow against the OpenAI stake ran into lender concerns over valuing a private company. Reuters reported that SoftBank offered a corporate guarantee if the OpenAI collateral proved insufficient. 2 A separately reported proposed two-year refinancing loan carried an indicative margin of roughly 275 basis points over SOFR, though that pricing applied to the reported proposed facility—not the newly expanded Arm margin loan. 1

Why investors are concerned

The central risk is a collateral-and-refinancing loop. Arm is publicly traded, so its value is visible and liquid—but also volatile. A material fall in its share price can reduce the headroom available under an Arm-backed margin loan just when SoftBank may want liquidity most.

OpenAI creates a different version of the same problem. SoftBank’s separate OpenAI-backed borrowing depends on a private-company holding whose valuation is harder for lenders to assess. That was a stated obstacle in earlier loan discussions. 2 A delayed public listing would not make the stake worthless, but it could leave SoftBank with less certainty about a near-term, liquid route to monetize or validate the collateral.

SoftBank is trying to manage this exposure by diversifying its funding sources: secured loans against Arm and OpenAI, repayment of bridge debt, new bank facilities, and possible bonds. But the strategy also means that market sentiment around AI, Arm’s share price, OpenAI’s valuation, and SoftBank’s credit quality can affect one another.

The key takeaway

SoftBank is not simply adding $25 billion of new debt for a single AI investment. It is expanding a collateral-backed liquidity facility secured by Arm while assembling a broader refinancing package for its AI commitments.

The $25 billion Arm facility strengthens funding capacity, but it also makes Arm’s market value more consequential to SoftBank’s financial flexibility. Until the new facility’s detailed terms are disclosed, the most defensible conclusion is that SoftBank has increased its available financing firepower—while increasing the importance of collateral values and successful long-term refinancing. 1718