SoftBank is seeking to issue over $11 billion in junk bonds—the largest such offering in history—to double down on AI investments. What key information warrants attention?

The significance of this deal extends far beyond its sheer size. First, consider its bond structure. The U.S. dollar tranches have maturities of 3.5 years, 5.5 years, and 7.5 years; the euro tranches mature in 4 and 6 years. This 'barbell' maturity profile itself merits scrutiny: the short end at 3.5 years suggests the issuer needs to replace short-term bridge loans with longer-dated debt as soon as possible, thereby easing refinancing pressure; the long end stretched to 7.5 years reflects a bet on the return horizon for AI investments. Yet the problem lies in the fact that OpenAI’s commercialization timeline is outside SoftBank’s control. SoftBank’s credit rating stands at BB+ from both S&P Global Ratings and Fitch—representing the highest tier within the speculative-grade category. This means coupon rates for these bonds will be priced relative to benchmarks for similarly rated Asian issuers. For reference, SoftBank’s May 2024 U.S. dollar bond issuance carried an 8.25% coupon for the 5.5-year tranche. Meanwhile, the yield on SoftBank’s existing dollar bonds maturing in 2031 has surged from 6.7% in January to 8.2% in September. This rising yield trend signals a continuous deterioration in market pricing of SoftBank’s credit risk. More critically, where does this bond issuance sit within SoftBank’s overall financing mix? To date, SoftBank has committed nearly $65 billion to OpenAI. In March, it secured a $40 billion bridge loan for this purpose—and just repaid $25.9 billion of the outstanding balance on September 15. The bond issuance is merely one method to repay short-term debt. At the same time, SoftBank is simultaneously increasing leverage across multiple fronts: margin loans collateralized by Arm shares have ballooned from an initial $8.5 billion to $25 billion, with approximately 72% of Arm’s equity—769 million shares—pledged as collateral. Apollo Global is currently negotiating with SoftBank to raise another loan from $5.4 billion to $9 billion. Connecting these dots reveals that SoftBank has added nearly $21 billion in new debt this year alone for AI-related investments, while bond-market funding approaches $15 billion—making it the largest high-yield borrower globally in 2026. At the credit-risk level, several signals deserve separate attention. SoftBank’s 5-year CDS spread serves as the most direct 'thermometer' of credit markets. It stood at roughly 218 basis points at the start of the year, spiked to 370 bps by late March, and hit a new annual high of 378.46 bps on September 15. For context, SoftBank’s CDS spread is now the widest among Japanese corporations—about 100 bps wider than Nissan Motor’s. In March, S&P downgraded SoftBank’s outlook from 'Stable' to 'Negative', citing concerns that additional OpenAI investments could impair the company’s liquidity and asset quality. Although Fitch affirmed its BB+ rating, its 'Stable' outlook hinges on SoftBank maintaining its loan-to-value ratio within a reasonable range—a threshold SoftBank itself has acknowledged may be 'temporarily breached' in the future. There is also an easily overlooked structural issue: OpenAI remains unlisted, and Masayoshi Son’s equity stake cannot be monetized. OpenAI CEO Sam Altman has explicitly stated that the company will not pursue an IPO this year. This means SoftBank’s $65 billion investment is locked-up liquidity—it cannot exit via public markets, nor can it readily find a buyer at a fair price in private markets.

SoftBank seeks over $11 billion in junk-bond financing; its OpenAI bet and Arm-collateralized loans are escalating leverage risk.

SoftBank Group is seeking to issue over $11 billion in high-yield bonds (i.e., junk bonds) to fund continued investments in artificial intelligence assets—including OpenAI. As bond financing proceeds alongside Arm-share collateralized loans and other funding channels, SoftBank’s leverage continues to rise, drawing market attention to its rising funding costs and mounting pressure around investment exits. On September 21, Bloomberg reported—citing informed sources—that the issuance comprises $10 billion in U.S. dollar bonds and €1 billion (approximately $1.14 billion) in euro-denominated notes. Proceeds will partially finance SoftBank’s additional investment in OpenAI, expected to close next month; bond pricing is anticipated to be finalized this Thursday. So far this year, SoftBank has raised nearly $15 billion in the bond market, making it one of the largest high-yield issuers globally since 2026. Meanwhile, market pricing of SoftBank’s debt has come under clear pressure. Its dollar bonds maturing in 2031 recently surged to yields of up to 8.2%, sharply higher than the January low of 6.7%; its credit default swap (CDS) costs have also climbed to multi-year highs. Against the backdrop of ever-expanding AI investment scale, rising funding costs and uncertainty surrounding asset exit timing are jointly testing SoftBank’s financial planning. Over $11 billion in junk bonds in the works to keep fueling OpenAI investments The proposed SoftBank issuance includes three U.S. dollar tranches totaling $10 billion, and two euro tranches totaling €1 billion. Citigroup serves as the lead bookrunner and global coordinator for the dollar portion; Goldman Sachs, JPMorgan Chase, and Morgan Stanley act as joint global coordinators. For the euro portion, JPMorgan serves as the lead bookrunner, with Goldman Sachs and Deutsche Bank participating as coordinators. SoftBank’s total committed investment in OpenAI has approached $65 billion. Its persistent ramp-up has steadily widened its financial exposure to OpenAI. In March, SoftBank arranged a $40 billion bridge loan to fund further OpenAI investments—and has recently repaid $25.9 billion of the outstanding balance. This bond financing signals that SoftBank continues to rely on newly incurred debt to fund its OpenAI investments. As individual investment sizes swell, the capital lock-up period for AI assets—and the timing and feasibility of future exits—increasingly shape SoftBank’s own financing needs. Expansion of Arm-collateralized loans and multi-channel financing push leverage higher

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