SB Energy Slows $50 Billion IPO as Debt Yields Near 10%

SB Energy has slowed preparations for an initial public offering that had been discussed at a $50 billion valuation, according to a September 22 Financial Times report. The SoftBank-backed developer's $4.9 billion debt package has met weak demand, with yields hovering around 10%.

The planned listing has become a stress test for the financing side of the AI buildout. Nvidia Corporation (NASDAQ:NVDA) has already invested $1.5 billion in SB Energy and committed another $1.5 billion tied to the IPO. American Electric Power Company (NASDAQ:AEP) sits on the other side of the same buildout through AEP Ohio's regional power partnership around SB Energy's large Ohio campus.

The contracts are huge, but the capital bill is larger

SB Energy says it has signed roughly 8.8 gigawatts of IT lease capacity. That figure includes the PORTS-Pike campus in Ohio, built for OpenAI. Nvidia serves as the exclusive AI-compute provider for that site and is providing credit support for an initial 4.25 gigawatts, with an option covering another 3.75.

That arrangement works for Nvidia because it converts a developer's financing into future demand for GPUs, networking and systems. The risk lies in the scale of the guarantee structure. Nvidia has disclosed maximum guarantee exposure that can reach $105 billion under defined conditions. The economics therefore become intertwined with OpenAI's ability to meet its lease obligations.

American Electric Power benefits from the electricity and transmission side of the same buildout. AEP has about 69 gigawatts of contracted load additions through 2030, with roughly 90% tied to data centers. The SB Energy and SoftBank regional plan includes cooperation with AEP Ohio.

Large-load tariffs, collateral and termination provisions can protect utility shareholders. But proposed demand is not the same thing as completed generation and transmission. Regulatory approvals and construction timing will decide when that load turns into earnings.

The bond market is asking for proof

Institutional investors have not abandoned either company. Insider Monkey's database counted 285 Nvidia hedge-fund holders in Q2 2026, up from 275 in Q1. Fisher Asset Management increased its stake by about 3% over the same period.

AEP had about 65 hedge-fund holders in Q2, up from roughly 62 in Q1. GQG Partners remained the largest disclosed hedge-fund holder on Insider Monkey's page with 10.26 million shares, after reducing its position by 32%. The filings predate the IPO slowdown.

What the slowdown actually signals

The IPO slowdown does not mean AI demand has disappeared. It says investors are starting to distinguish between contracted demand and financeable returns. Nvidia can still sell the compute. AEP can still earn on grid investment, even if SB Energy's equity valuation comes down.

But the message from credit markets is blunt. When a developer with OpenAI, SoftBank and Nvidia behind it still has to pay close to double-digit debt yields, the cost of capital has officially become part of the AI thesis.