Nvidia is in talks to co-sign OpenAI's lease on a 10-gigawatt campus rising over a decommissioned uranium enrichment plant in Piketon, Ohio. A second deal would finance up to 350 billion dollars in chip purchases. By Monday morning Nvidia shares were down 4.5% and the cost of insuring its bonds had posted its sharpest intraday jump since those contracts began actively trading in November.

There is a building in Pike County, Ohio, called X-330. It is the last process building still standing at a plant that enriched uranium for the American nuclear arsenal until 2001. Demolition is not scheduled to start until 2030.

Around it, on 3,700 acres of federal land, SoftBank's energy subsidiary is assembling what would be the largest data center campus ever announced: 10 gigawatts of compute, roughly double the total capacity of Northern Virginia, the world's biggest data center hub, in a county of about 28,000 people.

On Sunday, the Wall Street Journal reported who is expected to fill it, and how the bill gets paid. Nvidia is negotiating to guarantee roughly $250 billion of the financing behind OpenAI's tenancy. Bloomberg and Reuters confirmed the reporting the same weekend.

Nothing is signed. Terms are still moving and the Journal notes the talks could fall apart. But the structure under negotiation is unusual enough to be worth reading closely, because of what it is not.

Nvidia would not own the campus. Nvidia would not take equity. Nvidia would promise to pay if OpenAI cannot.

That distinction is the entire story. A guarantee exists because a lender wanted one, and a lender wants one when it does not believe the borrower can pay. OpenAI, despite the 852 billion dollar valuation set by its March 2026 raise and an annualized revenue run rate around 25 billion, holds no investment-grade credit rating. The long-dated lease and construction debt a half-trillion-dollar campus requires is effectively closed to it. Nvidia is the workaround.

The market noticed within hours.

The Guarantee Is a Liability, Not a Bet

Nvidia has been putting money into its own customers for two years, and until now every arrangement carried some upside.

The September 2025 letter of intent to invest $100 billion in OpenAI was milestone-linked, releasing capital only as each gigawatt of compute came online, which gave Nvidia a valve it could close. When that arrangement was restructured into a direct equity stake in February 2026, Nvidia at least owned something.

A financing guarantee has neither property. Nvidia gets no rent, no appreciation, no board seat, no claim on OpenAI's growth. If OpenAI pays its obligations, the guarantee earns Nvidia exactly nothing. If OpenAI defaults, Nvidia absorbs the loss.

The reported structure covers the lease and the construction debt. It explicitly does not cover the chips. Nvidia is separately discussing financing OpenAI's purchase of up to $350 billion of its own hardware, a second instrument stacked on the first.

Add them together and Nvidia's exposure under discussion reaches 600 billion dollars, all of it supporting one customer's ability to keep buying Nvidia products. Counting these alongside Nvidia's other outstanding commitments, Bloomberg put the running total at more than 750 billion dollars.

The Site Was Chosen for Its Power, Not Its Real Estate

The campus, branded the PORTS Technology Campus, plans 10 gigawatts of data center capacity paired with 9.2 gigawatts of on-site natural gas generation. The gas plants are the point. Because the campus makes its own electricity, it sidesteps the ratepayer backlash that has turned data centers into a local election issue across the country.

SoftBank broke ground on March 20, 2026, alongside U.S. Energy Secretary Chris Wright, Commerce Secretary Howard Lutnick, and Interior Secretary Doug Burgum. Phase 1 delivers 800 megawatts and targets completion around 2028. Full build-out targets the end of the decade.

Because the land is federal and decommissioned, the Commerce Department controls the power supply, and Japan has pledged a 33 billion dollar natural gas plant to serve it under a bilateral trade framework. That is not a normal landlord arrangement, and it is one reason antitrust and national security review are near-certain at this scale.

OpenAI is described as the leading tenant candidate. It is not the only one. Anthropic, Google, and Microsoft have also reportedly discussed the site with Lutnick.

The Bond Market Repriced Nvidia Before Lunch

Nvidia shares fell 4.5% in late morning trading on Monday, July 27.

The more revealing move happened in credit. Prices on credit default swaps tied to Nvidia bonds, which function as default insurance for bondholders, recorded their largest intraday increase since the contracts began trading actively in November, according to ICE Data Services figures cited by Bloomberg.

Credit default swaps do not care about narrative. They price the probability that Nvidia does not pay. On the day Nvidia was reported to be assuming a quarter-trillion-dollar contingent obligation, that probability got more expensive to insure against.

SEPTEMBER 2025

Nvidia signs a $100 billion letter of intent with OpenAI

Capital release tied to compute milestones. Analysts immediately raise circular-financing concerns.

FEBRUARY 2026

The commitment is restructured into a $30 billion equity stake

Smaller, but Nvidia now owns a position with potential upside rather than a promise.

MARCH 20, 2026

Construction begins at the former Portsmouth uranium site

Three U.S. cabinet secretaries attend. Phase 1 targets 800 megawatts by roughly 2028.

JUNE 8, 2026

OpenAI files confidentially for an IPO

Reporting since has pointed toward a 2027 listing rather than September. Either date forces public disclosure of exactly this kind of obligation.

JULY 26, 2026

The Wall Street Journal reports the $250 billion guarantee talks

Bloomberg and Reuters confirm the same weekend. Separate chip financing of up to $350 billion is also under discussion.

JULY 27, 2026

Nvidia falls 4.5% and its credit insurance spikes

Credit default swaps on Nvidia bonds post their largest intraday increase since active trading began in November.

The Short Sellers Already Named This Pattern

Two of the most prominent bears in the market responded publicly within a day, and both attacked the structure rather than the size.

Michael Burry, who disclosed and expanded a short position in Nvidia on July 24, posted on X:

"Around and around we go. Nvidia to guarantee $200 billion of ChatGPT's spending on $NVDA chips."

Michael Burry, investor, on X (July 2026)
His figure of 200 billion is lower than the 250 billion reported by the Wall Street Journal.

Jim Chanos, the short seller best known for calling Enron, went at the ratio:

"So we are at the point in the cycle where $NVDA has to provide financing guarantees for roughly 2/3rds of the cost of the chips it is selling to the data center project…?! Lol, ok." — Jim Chanos, on X (July 2026)

The argument both are making is about accounting, not sentiment. Nvidia books chip sales as revenue. OpenAI books the campus as infrastructure behind its revenue projections. Cloud partners book the contracted workloads as backlog. Three companies report growth from what critics argue is one pool of capital moving in a loop. Bloomberg analyses in 2026 identified more than 800 billion dollars in arrangements of this shape across the AI supply chain, a pattern we covered when big tech's AI spending began outrunning its cash flow.

A guarantee makes the loop tighter than an investment does. An investor can stop writing checks. A guarantor cannot walk away from a signature.

The Other Side Says the Circle Is Doing Its Job

The defense is not that the circularity is imaginary. The defense is that this is how capital-intensive infrastructure has always been financed.

Anthropic CEO Dario Amodei made the case at the New York Times DealBook Summit on December 3, 2025:

"One player has capital and has an interest, because they're selling the chips, and the other player is pretty confident they'll have the revenue at the right time, but they don't have $50 billion at hand. So I don't think there's anything inappropriate about that in principle." — Dario Amodei, CEO of Anthropic (DealBook Summit, December 2025)

The strongest version of that argument is empirical. The 2001 telecom collapse left dark fiber unlit in the ground. GPU capacity is consumed the day it is energized. OpenAI's weekly user base runs real inference on real silicon and generates real revenue. Nvidia reported 75.2 billion dollars in data center revenue in the first quarter of fiscal 2027 alone, at gross margins of about 75%, from a customer base far broader than OpenAI. Nortel and Lucent had no such business underneath their vendor financing.

Nvidia also spent Monday demonstrating that it is not betting on a single lab. The same day the guarantee reports landed, the company announced an investment and partnership with Safe Superintelligence, the startup founded by OpenAI co-founder Ilya Sutskever, saying it had obtained "rare access into the company's closely guarded research." The arrangement will let Safe Superintelligence increase its compute by an order of magnitude.

Neither Nvidia nor OpenAI commented on the Ohio reports on Monday.

What This Changes for People Who Buy Compute

The practitioner consequence is not abstract, and it is not about Nvidia's stock price.

Capacity gets more concentrated. A single tenant with a guarantor can lock a 10-gigawatt campus for a decade. Everyone else queues behind that contract.
Pricing gets less transparent. When the chip vendor guarantees the customer's lease, the market price of compute is partly a financing decision, not purely a supply-and-demand outcome.
Counterparty risk moves upstream. Teams have spent two years diversifying across model providers. This structure means the financial health of the chip vendor and the model lab are now coupled in ways procurement teams have not had to model before.
The disclosure is coming. OpenAI filed confidentially for an IPO on June 8, 2026. A contingent obligation of this size becomes a line item that public investors, and everyone reading the S-1, will finally get to see.

That last point matters most. Everything known about this deal today comes from people who were not authorized to speak about it. An IPO turns that into a document.

The Bottom Line

Strip the numbers down and the situation is simple. The most valuable chip company on earth is preparing to co-sign the lease of its biggest customer, because that customer cannot get the loan on its own, so that the customer can buy more chips from the company doing the co-signing.

Every participant can defend their piece. SoftBank gets a tenant. OpenAI gets a campus it operates rather than rents, at the same moment it is preparing a trillion-dollar public listing. Nvidia gets a decade of demand for the Vera Rubin platform. Ohio gets construction jobs on land nobody else wanted.

What nobody has explained is who absorbs the loss if the demand curve bends. The guarantee answers that question, and the answer is Nvidia. Its bondholders spent Monday deciding what that answer is worth.

Chanos put the arithmetic more plainly than any analyst note: two-thirds of the cost of the chips, guaranteed by the company selling them. Lol, ok.