SoftBank Group has issued approximately $11.1 billion in dollar- and euro-denominated bonds, raising fresh capital as the Japanese technology investment group moves toward the final tranche of its planned investment in OpenAI. The financing, disclosed in a company filing and reported by Reuters on September 24, 2026, includes senior notes across five maturity periods and is part of SoftBank’s broader effort to finance its expanding artificial intelligence investment program.
The bond sale is closely connected to SoftBank’s $30 billion follow-on investment commitment to OpenAI. SoftBank has already funded two $10 billion tranches of that commitment, while the final $10 billion tranche is scheduled for October 2026. If the full commitment is completed, SoftBank’s cumulative investment in OpenAI is expected to reach approximately $64.6 billion, according to SoftBank’s February agreement and its latest disclosures.
The transaction is significant because it shows how a major technology investment company is using the debt markets to support one of its largest AI investments. It also highlights the growing connection between the AI industry’s enormous capital requirements and corporate financing markets. SoftBank, rather than OpenAI, is the borrower in this transaction: the bonds are SoftBank securities, while OpenAI is the investment target.
SoftBank’s latest financing consists of $10 billion of dollar-denominated senior notes and €1 billion of euro-denominated senior notes. Reuters reported that the dollar notes were issued in three tranches: $1 billion with a 3.5-year maturity, $4.5 billion with a 5.5-year maturity and another $4.5 billion with a 7.5-year maturity.
The dollar notes carry annual coupon rates of 8.625%, 9.25% and 9.75%, respectively. SoftBank also issued two €500 million euro-denominated senior-note tranches, with four-year and six-year maturities and yields of 7.125% and 8%, respectively.
The total dollar-equivalent value of the transaction is approximately $11.1 billion. The precise dollar equivalent of the euro portion naturally varies with exchange rates.
For readers unfamiliar with corporate bonds, the basic mechanism is straightforward. A company issues debt securities to investors in exchange for capital. The company agrees to make interest payments according to the bond’s terms and generally repay the principal when the bond reaches maturity.
That means SoftBank is obtaining capital today while taking on future interest and repayment obligations.
The transaction follows another significant financing move by SoftBank earlier in September, when it issued 1 trillion yen, equivalent to about $6.32 billion at the Reuters-reported exchange rate, in corporate bonds aimed at retail investors.
Taken together, the transactions illustrate the scale of capital SoftBank is mobilizing as it expands its AI-focused investment strategy.
The immediate connection to OpenAI comes from SoftBank’s previously announced $30 billion follow-on investment.
In February 2026, SoftBank announced a definitive agreement to participate in OpenAI’s fundraising and make $30 billion of additional investment through SoftBank Vision Fund 2. The investment was structured in three $10 billion tranches. SoftBank completed the first $10 billion tranche in April and planned the second for July and the third for October.
SoftBank’s own disclosures say the consideration for the investment was initially expected to be financed through bridge loans and other financing arrangements and later replaced through existing assets and other financing measures.
That financing plan helps explain the role of the new bonds.
In March, SoftBank entered into a $40 billion bridge facility primarily to raise funds for the OpenAI follow-on investment and for general corporate purposes. The company said borrowings under that facility were expected to be repaid over time using existing assets and other financing measures.
The latest bond issuance provides another form of longer-term financing.
Importantly, the bond proceeds should not be described as an investment made by OpenAI or as debt issued by OpenAI. SoftBank is issuing the bonds and assuming the debt. OpenAI is the company in which SoftBank is investing.
SoftBank’s February 2026 announcement said that it had already invested $34.6 billion in OpenAI through SoftBank Vision Fund 2 since September 2024.
The company then committed another $30 billion in three tranches. Once that entire follow-on investment is completed, SoftBank expects its cumulative investment in OpenAI to reach $64.6 billion, representing an ownership interest of approximately 13%, subject to the terms and completion conditions of the transaction.
The distinction between those numbers is important.
The $34.6 billion figure represents SoftBank’s cumulative investment before the additional $30 billion commitment announced in February.
The additional $30 billion is a separate follow-on investment commitment.
Of that $30 billion, SoftBank’s fiscal 2026 materials state that $20 billion had already been funded through the first two tranches, with the remaining $10 billion scheduled for October 2026.
The latest $11.1 billion bond transaction is therefore closely associated with financing the final $10 billion payment.
The bond issuance itself does not mean that SoftBank has invested $11.1 billion in OpenAI. The two figures serve different purposes: one is the amount of debt securities issued, while the other is the amount of the planned investment tranche.
The reported structure is as follows:
| Currency | Amount | Maturity | Coupon/Yield |
|---|---|---|---|
| U.S. dollar | $1 billion | 3.5 years | 8.625% |
| U.S. dollar | $4.5 billion | 5.5 years | 9.25% |
| U.S. dollar | $4.5 billion | 7.5 years | 9.75% |
| Euro | €500 million | 4 years | 7.125% |
| Euro | €500 million | 6 years | 8% |
A coupon rate is the stated annual interest rate on a bond’s principal amount. For example, an 8.625% coupon on a $1 billion face-value tranche corresponds to a stated annual interest obligation of $86.25 million before considering the precise payment schedule and other terms.
The coupon should not, however, automatically be treated as the complete economic cost of borrowing. The total financing cost can also depend on the issue price, fees, currency effects, repayment terms and other transaction characteristics.
Similarly, maturity tells investors when the principal is scheduled to come due. A longer maturity gives the issuer more time before repayment but can also leave investors exposed to the issuer’s credit and market conditions for a longer period.
SoftBank has increasingly organized its investment strategy around artificial intelligence, with OpenAI at the center of its AI model investments.
The company describes OpenAI as its key partner in the AI-model area, while identifying Arm as an important semiconductor-related asset and data centers and power as core parts of AI infrastructure.
SoftBank’s current strategy therefore extends beyond investing in individual software companies. It includes exposure to different layers of the AI ecosystem, from AI models and semiconductor technology to infrastructure.
OpenAI represents the model and application side of that strategy.
SoftBank’s February agreement said the additional investment would support OpenAI’s continued growth and that the company’s AI strategy included accelerating OpenAI’s research and ecosystem expansion.
The latest bond financing fits into this broader capital-allocation approach. Instead of funding the entire investment solely through existing cash, SoftBank is using debt markets alongside other financing tools.
That approach allows an investment holding company to access capital without immediately selling all of the assets it owns. At the same time, debt creates contractual financial obligations that must be managed over time.
SoftBank itself says it manages its loan-to-value ratio below 25% under normal market conditions, with an upper threshold of 35% in extraordinary circumstances, while maintaining cash sufficient to cover bond redemptions for at least two years.
OpenAI has become one of the most important companies in the generative AI sector through products including ChatGPT and its API services.
SoftBank’s own management materials describe OpenAI as an AI model developer whose technology is being used across areas including text generation, software development and data analysis. SoftBank also said ChatGPT’s weekly active users increased from 500 million in March 2025 to more than 900 million in February 2026.
The economics of frontier AI also help explain why financing has become such an important part of the sector.
Developing increasingly capable AI systems requires substantial spending on computing infrastructure, data-center capacity, energy and specialized hardware. Reuters reported earlier in September that OpenAI expected very large cash requirements through 2030 as it expanded computing and infrastructure spending, citing a Financial Times report based on an OpenAI presentation.
That environment makes access to large pools of capital an important component of the AI business.
SoftBank’s role is different from that of OpenAI itself. SoftBank is allocating capital as an investor, while OpenAI uses capital to develop its technology, products and infrastructure.
For SoftBank, the bond transaction provides capital but also creates financial obligations.
The most direct obligation is interest. Investors who purchase the bonds are entitled to the payments specified by their terms. At maturity, SoftBank generally must repay the principal unless the debt is otherwise refinanced or settled according to the applicable terms.
This creates several financial considerations.
First is interest expense. Higher coupon rates mean larger scheduled interest payments relative to a lower-rate borrowing structure.
Second is maturity risk. The bonds mature at different points between roughly 3.5 and 7.5 years for the dollar notes, while the euro notes mature in four and six years. SoftBank will therefore have obligations spread across multiple dates.
Third is refinancing risk. When debt reaches maturity, an issuer may need sufficient cash or access to new financing to repay it if it does not have enough internal funds.
Fourth is investment exposure. SoftBank is using borrowed capital to support a large investment portfolio, including its OpenAI investment. The value of investments can change over time, while debt obligations remain contractual.
SoftBank has explicitly identified financing risk and changes in the market environment as areas it monitors as its AI investments expand.
These factors do not by themselves establish whether the financing will produce a particular outcome. They describe the financial mechanics that accompany the transaction.
The reported coupon rates are notable because the dollar notes carry coupons ranging from 8.625% to 9.75%.
A high coupon means a larger stated interest obligation for the issuer than a bond with a lower coupon, all else being equal.
Investors may demand different yields on corporate debt depending on factors such as the issuer’s credit profile, prevailing interest rates, market conditions, maturity and the structure of the securities.
The latest transaction should therefore be viewed as a financing decision with both benefits and costs.
SoftBank receives capital that can be deployed toward its investment strategy. In exchange, it takes on interest and principal obligations extending across several years.
The coupon rate should also not be confused with SoftBank’s entire cost of financing. The actual economic cost depends on the full terms of the securities and the prices at which they were issued.
The distinction between SoftBank’s financing and OpenAI’s financing is especially important.
SoftBank issued the bonds. OpenAI did not.
The proceeds are being used by SoftBank to help fund its investment, including the final $10 billion tranche of its previously announced $30 billion commitment to OpenAI. Reuters reported that completion of that investment would bring SoftBank’s cumulative investment to approximately $64.6 billion.
That does not mean OpenAI receives the entire $11.1 billion bond proceeds directly.
Instead, SoftBank is raising capital to meet its own investment obligations.
This structure is common to the basic distinction between an investor and its portfolio company. An investor can raise money through debt, equity sales, asset sales or other financing mechanisms and then deploy those resources into investments.
In this case, the financing capacity of SoftBank is an important part of how the company is executing its OpenAI investment commitment.
SoftBank has a long history of investing in technology companies, but its current strategy places considerably greater emphasis on AI.
The company’s Vision Fund structure gave it a platform for large-scale technology investments across multiple sectors. Its more recent strategy has increasingly focused on AI-related businesses and infrastructure.
SoftBank’s current management materials identify AI model development, semiconductors, data centers and power as key areas in the company’s strategy.
The company also continues to emphasize Arm as a major part of its semiconductor exposure.
OpenAI sits within that strategy as a major AI-model investment. SoftBank’s February agreement established the $30 billion follow-on investment, while its earlier investment activity had already created a substantial position.
The scale of the latest financing demonstrates how capital-intensive that strategy has become.
SoftBank is not relying on one funding mechanism. Its 2026 financing activity has included bridge financing, corporate bonds and other measures intended to support its investment program.
SoftBank’s current relationship with OpenAI developed through investments beginning in 2024.
According to SoftBank, it had invested $34.6 billion cumulatively in OpenAI as of the end of fiscal 2025. The company then announced another $30 billion commitment in February 2026.
The new commitment was divided into three $10 billion tranches.
SoftBank completed the first tranche on April 1, 2026, and its own disclosures indicate that the second tranche was subsequently funded in July. The remaining $10 billion is scheduled for October 2026.
SoftBank’s February agreement also stated that the investment would involve preferred shares that would automatically convert into common shares in connection with an IPO or related listing transaction, subject to the transaction terms.
The planned cumulative investment of $64.6 billion should therefore be understood as the result of the earlier $34.6 billion investment plus the additional $30 billion commitment, assuming completion of the planned transactions.
Several developments will provide additional information about SoftBank’s financing and OpenAI investment strategy.
One is the completion of the final $10 billion OpenAI tranche, scheduled for October 2026 under SoftBank’s announced timetable. The company’s disclosure notes that the closing dates could be accelerated in certain circumstances, including an OpenAI public listing transaction.
Another is SoftBank’s broader debt position.
Investors can also monitor future bond issuance, refinancing activity, cash levels and the company’s loan-to-value ratio. SoftBank has said that maintaining financial discipline while making large AI investments is a priority.
Developments at OpenAI will also remain relevant because SoftBank’s investment exposure is tied to the value of its holdings.
Finally, AI infrastructure spending remains an important part of the broader industry backdrop. Capital requirements for computing, data centers, chips and power can influence the financing needs of AI companies and the investors supporting them.
SoftBank issued the bonds to raise capital for its investment and AI strategy. Reuters reported that the proceeds will be used to fund the final $10 billion tranche of SoftBank’s $30 billion follow-on investment commitment to OpenAI.
Yes. Reuters reported that the bonds will be used to fund the final $10 billion tranche of SoftBank’s previously announced $30 billion OpenAI commitment.
SoftBank said its cumulative OpenAI investment was $34.6 billion before its latest $30 billion follow-on commitment. Once that additional commitment is completed, the cumulative amount is expected to reach approximately $64.6 billion.
The February 2026 agreement calls for a further $30 billion investment in three $10 billion tranches. Combined with the previously accumulated $34.6 billion, the expected cumulative investment is approximately $64.6 billion after completion.
The three dollar-denominated tranches carry coupons of 8.625%, 9.25% and 9.75%. The two euro-denominated tranches have reported yields of 7.125% and 8%.
The dollar notes mature in 3.5, 5.5 and 7.5 years. The euro notes mature in four and six years.
Yes. SoftBank is using debt financing as part of the funding strategy for its OpenAI investment. The company had previously arranged a $40 billion bridge facility primarily for the follow-on investment and said it planned to replace bridge financing with other funding measures over time.
The bond proceeds are raised by SoftBank. Reuters reported that they will be used to fund SoftBank’s final $10 billion investment tranche in OpenAI. The bond issuance should therefore not be described as OpenAI issuing or borrowing the money.
SoftBank identifies AI as a central part of its investment strategy, with OpenAI as a key AI-model investment and Arm as an important semiconductor asset. The company is also focused on AI infrastructure, including data centers and power.
SoftBank has been an investor in OpenAI since 2024 and announced a further $30 billion investment commitment in February 2026. The additional investment is being made through SoftBank Vision Fund 2.
Issuing bonds creates debt obligations for SoftBank, including interest payments and repayment of principal according to the securities’ terms. SoftBank has stated that it manages its financial policy through measures including loan-to-value controls, cash management and financing arrangements.
Key developments include completion of the final OpenAI investment tranche, SoftBank’s future financing and debt activity, its liquidity and loan-to-value position, and developments affecting the value and financing requirements of AI investments. These are observable financial and corporate developments rather than guarantees about future investment performance.