SoftBank secures OpenAI-backed margin loan from major banks

SoftBank just convinced a group of Wall Street’s biggest names to lend it $10 billion against shares in a company that isn’t even publicly traded yet. The two-year margin loan, finalized on August 6, is backed entirely by SoftBank’s stake in OpenAI.

The syndicate behind the deal reads like a who’s-who of global finance: Goldman Sachs, JPMorgan Chase, Mizuho Securities, Apollo Global Funding, and Sumitomo Mitsui Banking Corp.

The road to $10 billion was anything but smooth

Negotiations began in spring 2026 with a $10 billion target, but lender anxiety about slapping a firm valuation on a private company’s shares quickly became a problem. By mid-2026, the loan had been trimmed to roughly $6 billion as banks got cold feet about what OpenAI shares were actually worth in a liquidation scenario.

SoftBank CEO Masayoshi Son went back to the table in July. The key concession that unlocked the full $10 billion was a corporate guarantee from SoftBank itself, essentially telling lenders that if OpenAI’s valuation cratered, the parent company would backstop the difference.

The corporate guarantee matters because it shifts risk in a meaningful way. Without it, lenders would be stuck holding illiquid private shares in a worst-case scenario. With it, they have a claim against SoftBank Group’s broader balance sheet, which includes publicly traded assets like its massive Arm Holdings position.

Son’s AI spending spree in context

SoftBank has committed over $60 billion to OpenAI and related AI infrastructure projects. The company also has a $40 billion bridge loan maturing in March 2027 and a separate $20 billion margin loan backed by its stake in Arm Holdings.

OpenAI confidentially filed for a US IPO in June 2026, which means these currently illiquid private shares could become tradeable public equity in the relatively near future. An IPO would dramatically simplify the collateral picture for the banks involved in this loan, giving them shares they could actually sell on the open market if SoftBank defaulted.

For SoftBank, the loan provides liquidity without forcing the company to sell any of its OpenAI stake.

What this means for investors

The deal is a signal about where the traditional finance world stands on private AI assets as collateral. Banks are willing to lend against them, but only with significant protections like corporate guarantees.

SoftBank now has tens of billions in loans tied to assets whose valuations depend on continued AI momentum. Son’s $40 billion bridge loan comes due in March 2027, and refinancing that in a less friendly market would be, to put it mildly, uncomfortable.

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