How SoftBank Is Using an $11 Billion Bond Sale to Fund OpenAI

SoftBank Group is using the bond market to fund the next stage of its unusually large OpenAI commitment. The company has launched $10 billion of U.S.-dollar senior unsecured notes and €1 billion of euro-denominated senior unsecured notes, with proceeds intended to fund a $10 billion OpenAI payment due October 1 and replace earlier bridge borrowing. 318

In practical terms, the transaction shifts part of the financing from short-dated bank funding into bonds that mature over several years. That gives SoftBank more time to fund its investment, while making its balance sheet more dependent on public-debt investors and the eventual value of its OpenAI stake.

What SoftBank is selling

The proposed issuance is split across five tranches:

• $10 billion of dollar notes maturing in 3.5, 5.5 and 7.5 years
• €1 billion of euro notes maturing in 4 and 6 years

The notes are senior unsecured, meaning they are not backed by specified collateral and rank as general obligations of SoftBank. The term sheet indicated an expected pricing date of September 24 and settlement date of September 29. 318

Selling in both dollars and euros broadens the potential investor base. More importantly, the maturities move the repayment timetable beyond the immediate October OpenAI funding deadline.

The immediate use of proceeds: a $10 billion OpenAI payment

The central purpose is to finance SoftBank’s third $10 billion follow-on investment payment to OpenAI, expected to close on October 1. The offering is also intended to replace an earlier bridge loan used in connection with that funding. 34

SoftBank announced in February that it had agreed to make $30 billion in follow-on investments in OpenAI through SoftBank Vision Fund 2. Once the follow-on investment is complete, SoftBank said its cumulative OpenAI investment is expected to total $64.6 billion, representing approximately 13% ownership.

This makes the bond sale less a new strategic investment than a financing choice: SoftBank is finding more durable funding for an investment commitment it has already made.

How the sale fits into SoftBank’s broader refinancing

The new bonds come after SoftBank moved to repay the balance of a separate $40 billion facility used for OpenAI-related investments and other costs. SoftBank said the remaining $25.9 billion balance would be paid down on September 15 as it sought to refinance with longer-term debt. 17

The company has also obtained an approximately $11.87 billion, two-year loan from around 20 banks to support its OpenAI investment, according to reports. 2

Together, these steps show a layered financing approach: bridge loans and bank facilities can provide speed and flexibility, while public bonds can extend maturities. The trade-off is that unsecured bond financing leaves SoftBank exposed to changes in investor appetite and borrowing costs.

Why investors are focused on leverage and valuation

SoftBank has reported large gains as the value of its OpenAI investment rose. For the January–March quarter, the company reported net profit of ¥1.83 trillion, while the Vision Fund recorded an OpenAI-driven gain of ¥3.1 trillion. 19

Those gains strengthen the reported value of SoftBank’s assets, but they do not by themselves create cash to service debt. OpenAI remains a private company, so the value of SoftBank’s stake is less immediately liquid than a publicly traded holding. That distinction matters when a company funds a major private investment with substantial borrowings.

The key question for bond investors is therefore not simply whether OpenAI’s valuation rises. It is whether SoftBank can comfortably manage the interest costs and maturities of its debt while waiting for a future liquidity event or other cash realization from the investment.

The bottom line

SoftBank’s $10 billion dollar bond sale and €1 billion euro bond sale are designed to ensure it can meet its October 1 OpenAI commitment while replacing short-term bridge funding with debt that matures in 3.5 to 7.5 years. 318

That improves funding certainty in the near term. But it also concentrates more of SoftBank’s capital structure around a large, private OpenAI investment—making the company’s future financing costs and the eventual liquidity of that stake central issues for investors to watch.