SoftBank spent Monday doing two things that do not usually happen on the same day. In the morning, its US data-center developer SB Energy quietly pushed back a Nasdaq IPO that had been slated to price this week at a valuation of $50 billion or more, after bankers could not find enough buyers at that level. Hours later, the parent company launched one of the largest junk-bond sales on record, seeking more than $11 billion from high-yield investors to fund its next check to OpenAI. The equity market said no; SoftBank turned to the debt market and asked for more.
The two moves are tied together by a single counterparty. SB Energy filed its S-1 on September 1, planning to raise between $5 billion and $7 billion under the ticker SBE, with a separate Japanese retail tranche of up to $500 million. The prospectus told investors in plain language that the company is “substantially dependent” on OpenAI, which is simultaneously its anchor tenant and an equity investor. OpenAI holds 17 leases covering roughly 8 gigawatts of planned capacity in Ohio, plus $5.5 billion in warrants that vest after the IPO. Nvidia has agreed to provide a $105 billion financing guarantee for the first phase of that Ohio campus and to buy $1.5 billion of stock in a private placement.
What SB Energy does not yet have is a working data center. The company reported $138.7 million in revenue for the first half of 2026, almost all of it from a legacy solar business, against a net loss of $3.21 billion and an operating loss of $551.6 million. It claims a contracted backlog of about $439 billion, but roughly $357 billion of that is not expected to be recognized until 2034 or later, and building the pipeline requires more than $170 billion of capital spending. Analysts cited in coverage of the deal estimated the company would need another $7 billion of equity beyond the IPO proceeds just to keep funding its customary 10 percent equity slice of each project.
“This concentration means that our near-term revenues, project-level financing arrangements, and development plans are significantly linked to OpenAI’s continued performance under our lease and related agreements,” SB Energy wrote in its filing. The document also flagged a newer kind of risk: “We may face community opposition, local moratoria and hyper-local dissent, including growing public resistance to AI and AI-related infrastructure.”
SB Energy chief executive Rich Hossfeld had pitched Nvidia’s involvement as the thing that made the numbers work. The chipmaker’s participation “helps us to unlock things like investment-grade financing,” he told CNBC when the S-1 was filed. Three weeks later, public-market investors decided that a guarantee from Nvidia and a lease from OpenAI were not enough to justify a $50 billion price for a company whose revenue is a rounding error against its losses.
The bond deal is the other half of the story. According to the term sheet reported by Bloomberg and Reuters, SoftBank Group is offering $10 billion of dollar-denominated senior unsecured notes across 3.5-, 5.5- and 7.5-year tenors, plus 1 billion euros in four- and six-year paper. Pricing is set for September 24 with settlement on September 29. Proceeds are earmarked in part for a follow-on OpenAI investment expected to close next month, which would bring SoftBank’s cumulative outlay in the ChatGPT maker to roughly $64.6 billion for a stake of about 13 percent. If it closes at full size, the sale would be the largest non-financial corporate bond from Asia Pacific and Japan ever, topping the $10.93 billion 7-Eleven raised in 2021.
Why it matters
Masayoshi Son has bet SoftBank on OpenAI more completely than any other outside investor, and Monday showed how the financing plumbing behind that bet is starting to strain. The SB Energy IPO was supposed to be a release valve: a way to recycle SoftBank’s data-center exposure into public equity, hand OpenAI a liquid stake through its warrants, and set a valuation anchor for the wave of AI-infrastructure listings queued up behind it. Instead, the deal is stalled, and SoftBank is leaning harder on junk-rated debt, at a moment when OpenAI itself has said it will not pursue a 2026 IPO and is instead courting private money at a reported $1.2 trillion valuation.
The skepticism is not confined to SoftBank. Holtec International shelved a $900 million nuclear IPO last week, with founder and chief executive Kris Singh describing the market’s turn against the data-center economy as a “perfect storm” for anyone whose story is tied to AI power demand. Nscale filed for a $3 billion listing on the same day SB Energy delayed, and its own prospectus shows Microsoft and Anthropic behind 85 percent of a $103 billion backlog. Investors are increasingly asking the same question of every one of these companies: how much should you pay today for revenue that arrives in 2034, from a tenant that is itself burning cash and still private?
For OpenAI, the implications are direct. Its compute expansion assumes partners like SB Energy can raise tens of billions cheaply. If public equity is closed and the cost of SoftBank’s debt keeps climbing, the cost of building OpenAI’s capacity climbs with it, and the $5.5 billion warrant package that was supposed to align the two companies stays on paper.
What to watch
The immediate tell is the bond pricing on Wednesday, September 24: the coupon SoftBank has to pay, and whether the book fills at $11 billion, will say more about investor confidence in the OpenAI trade than any IPO roadshow. After that, watch whether SB Energy refiles with a lower valuation range or waits for OpenAI’s private round to set a new mark, and whether Nvidia or OpenAI steps in with more direct capital to keep the Ohio timeline intact. And watch the rest of the AI-infrastructure IPO calendar, starting with Nscale: if that deal also slips, the fall window that was supposed to fund the next phase of the build-out will have closed before it opened.
“This concentration means that our near-term revenues, project-level financing arrangements, and development plans are significantly linked to OpenAI’s continued performance under our lease and related agreements.”— SB Energy, S-1 prospectus, SEC filing