SoftBank Group is moving to borrow the equivalent of more than $11 billion in junk bonds, one of the largest deals of its kind, as Masayoshi Son leans harder into OpenAI and leaves the market to price the risk. The financing is meant to help fund SoftBank’s $10 billion payment for the third tranche of its follow-on investment in the ChatGPT maker, a bet that underscores how much capital Son is willing to push toward artificial intelligence even as credit investors stare at a balance sheet getting heavier.
The deal lands at a tricky moment for SoftBank credit. The company’s 2031 dollar bond yield climbed to 8.2% earlier this month from a low of 6.7% in January, and the cost to insure its debt against default has reached the highest level in three years, according to Bloomberg. That backdrop matters because this is not a plain-vanilla refinancing. SoftBank is tapping the high-yield market to help pay for a private-company investment that does not generate near-term cash flow, which is exactly the kind of structure that can test investor appetite when spreads are already sensitive.
The financing package is built around $10 billion of dollar notes across three maturities — 3.5 years, 5.5 years and 7.5 years — plus €1 billion, or about $1.1 billion, of euro notes across 4- and 6-year maturities, according to Reuters and CNBC TV18. The bonds will cancel a previously secured $10 billion bridge loan facility for the OpenAI investment. Bond pricing is expected Sept. 24, with settlement Sept. 29, and the third tranche of the OpenAI follow-on investment is expected to close Oct. 1.
The scale is striking even by SoftBank standards. Bloomberg and The Edge Singapore reported that the conglomerate has committed close to $65 billion to OpenAI. That is a massive concentration of capital in a company that remains private, highly valued and central to the current artificial intelligence trade. For SoftBank, the wager is straightforward: if OpenAI remains the strategic center of AI infrastructure and applications, Son wants his firm seated as one of the biggest backers. For credit investors, the question is whether that upside justifies the added leverage.
SoftBank is rated BB+ by S&P Global Ratings, its highest speculative-grade rating, which gives the issuer access to a broader junk-bond market than lower-rated names. Even so, the company has already sold almost $15 billion of notes across currencies in 2026, making it the biggest junk-rated borrower so far this year, according to Bloomberg and Moneycontrol. That borrowing pace helps explain why investors are watching this new transaction so closely: it is not just another issuance, but another large call on the market’s willingness to fund Son’s ambition.
There is also a simple timing issue. The notes are coming after a stretch in which SoftBank credit has weakened. Higher yields and wider protection costs tell a market story that is less about panic than about caution. Investors are being asked to lend against a company whose strategy is increasingly linked to a single, enormous AI exposure. The proceeds are going out the door as equity in a private business rather than into a project with visible near-term cash generation, a point that BNP Paribas strategist Mana Nakazora highlighted in Tokyo.
“This is a financing decision that tells you how Son values the OpenAI stake relative to the cost of his balance sheet. The market will price the notes on the assumption that the proceeds go out the door as equity in a private company, not into anything that generates near-term cash flow,” Nakazora said.
The underwriting lineup shows the market expects serious distribution power to be required. Citigroup and JPMorgan are lead bookrunners, with Goldman Sachs, Morgan Stanley and Deutsche Bank also involved as coordinators, according to Bloomberg and The Edge Singapore. That roster signals a deal that will be pushed hard across global credit desks, especially since the offering spans both dollars and euros and comes in multiple maturities. In other words, this is not just about one bond; it is about stitching together demand from investors with different currency and duration preferences.
SoftBank’s willingness to use high-yield debt to support OpenAI also says something about how Son is managing capital structure. Instead of relying solely on cash or slower-moving asset sales, the company is reaching into a market that has already rewarded it with large amounts of financing this year. That works when risk appetite is available and when investors still believe the growth story is worth the credit risk. It becomes more complicated when a company keeps leaning on the same funding channel to support a rapidly expanding AI position.
Still, the market has not shut SoftBank out. The company’s ability to come back with another large deal suggests there is enough demand for the story, even if pricing will need to do some work. The fact that the company is moving from a bridge loan to bonds also matters: it replaces a short-term facility with longer-dated public debt, which can reduce immediate refinancing pressure. But that does not eliminate the fundamental question. Investors are still being asked to finance a major equity bet in OpenAI, and they know it.
SoftBank’s OpenAI commitment has become a live test of how far the market will follow Son’s vision. The conglomerate is not just funding a strategic investment; it is doing so in a way that leaves its own credit profile exposed to the success of a private company that is central to the AI boom. That can work if confidence stays high. It can also turn quickly if investors decide the cost of leverage is outrunning the payoff.
For now, the issue is not whether SoftBank can find buyers. It likely can. The real question is what price it must pay to do so, and whether that cost tells the market something uncomfortable about how much risk the group is carrying to stay in front of AI’s biggest story. When pricing arrives Sept. 24, investors will get their clearest answer yet on how much faith remains in Son’s OpenAI play.
