Neocloud Stocks and Debt: CoreWeave's $35B Bet vs Nebius

Neocloud stocks have become the place where AI bubble fears show up first. CoreWeave, Nebius and IREN each lost more than 30% of their value in October, CNBC reported, as bond investors started charging CoreWeave distressed-level prices to borrow. The short answer to whether these companies are a weak link: some are much more exposed than others. CoreWeave carried about $35.1 billion of debt against $5.0 billion of equity at the end of June, while Nebius had $8.5 billion of debt, almost fully covered by cash.

A neocloud is a cloud company built almost entirely to rent out GPUs, mostly Nvidia chips, to AI labs and big tech companies that need more computing power than they can build themselves. Unlike Microsoft, Amazon or Alphabet, a neocloud has no search, retail or software business to pay for its data centers. It funds them with borrowed money, new shares and customer prepayments, and repays that money from rental contracts. That structure is why the group has turned into a test of how much leverage the AI build-out can carry.

October was the worst month for neocloud stocks

The selloff started before the Big Tech earnings that hit the Nasdaq at the end of the month. By October 21, CoreWeave was down 36% for the month, Nebius 33% and IREN 38%, according to CNBC. CoreWeave's market value had fallen to about $31 billion, from a peak of about $90 billion.

Elon Musk, whose SpaceX sells computing capacity and competes with the neoclouds, gave the fear a slogan on October 25. Replying to investor Chamath Palihapitiya on X, Musk argued that debt markets had almost shut off funding for companies without substantial revenue outside AI data centers.

CoreWeave and Nebius have very different balance sheets

The two largest listed neoclouds both grew revenue at triple-digit rates in the second quarter. The way they paid for that growth could hardly be more different. CoreWeave's balance sheet at June 30 showed $31.4 billion of recourse debt and $3.7 billion of non-recourse debt, for a total of about $35.1 billion, against $5.5 billion of cash and $5.0 billion of stockholders' equity. That is roughly seven dollars of debt for every dollar of equity, as TheStreet calculated in a comparison of the two companies.

Nebius ended June with $8.5 billion of debt and $8.0 billion of cash, so its net debt was only about $0.5 billion. Its shareholders' equity was about $10.3 billion, which puts debt at under one times equity. Nebius has leaned more on equity: it raised $2.8 billion from selling treasury shares in the second quarter, its cash flow statement shows.

Prepayments are the other difference. Nebius reported almost $6.0 billion of deferred revenue at the end of June, $5.0 billion of it non-current, up from about $1.6 billion at the end of 2025. Deferred revenue is cash customers have paid in advance for capacity they have not used yet, so it funds construction without adding interest costs. Marc Boroditsky, Nebius's chief revenue officer, told CNBC that Nebius is not carrying the kind of debt that its rivals are.

Interest costs are growing faster than CoreWeave's revenue

CoreWeave's growth is real. Revenue more than doubled to $2.58 billion in the second quarter, and the company reported a revenue backlog of about $104 billion, not counting more than $25 billion of new commitments signed in early third quarter. Active power reached 1.5 gigawatts and contracted power about 3.7 gigawatts.

The cost of financing that backlog is rising faster. Net interest expense was $640 million in the quarter, up 140% from $267 million a year earlier, while revenue rose 112%. CoreWeave posted an operating loss of $49 million and a net loss of $626 million. Capital spending was $6.4 billion in the quarter and $14.1 billion in the first half. In the same quarter CoreWeave issued $13.5 billion of new debt and repaid $3.9 billion.

Customer concentration adds to the risk. More than two-thirds of CoreWeave's revenue last year came from Microsoft, CNBC reported, citing the company's annual report. Baird estimates that CoreWeave may need about $30 billion of new funding in 2027, according to CNBC.

The credit market is pricing distress

Bond investors have moved faster than stock analysts. CoreWeave's unsecured debt yields about 15%, and its five-year credit default swap spread stood at 1,145 basis points, up 179% over the past year and 39% in October alone, CNBC reported on October 21. Spreads at that level are generally read as a sign of distress. CNBC's sources also said the high-yield bond market was effectively on hold until after the midterm elections, which matters for companies that refinance often.

Other neoclouds are feeling the same pressure. Firmus scrapped a planned IPO in October, and the UK neocloud Nscale, which filed to list on the New York Stock Exchange in September, faces questions about whether it will proceed, CNBC reported. Not everyone is bearish. Goldman Sachs upgraded CoreWeave to buy, writing that not all neoclouds are created equal, and banks including JPMorgan and Barclays point to loans backed by GPUs and to investment-grade customers such as Microsoft and Meta, TheStreet noted. Nvidia chief executive Jensen Huang has called demand for neocloud capacity off the charts.

What the AI Bubble Index shows

The AI Bubble Index read 62.9 after the October 30 close, in the Normal band, down from 64.1 a week earlier. The systemic risk family, which tracks stress in the financial system around the AI trade, reads 68.2, and the Fragility axis is 68, slightly above Euphoria at 66.3. The sentiment and attention family is the highest at 91.8. The index does not track individual neocloud bonds, so it does not measure CoreWeave's credit directly; it shows that broad market fragility is now as much a part of the picture as euphoria. The methodology explains how the axes are built, and the dashboard shows the families day by day.

The telecom build-out is the closer comparison

The neoclouds fit an old pattern better than they fit the dot-com stocks themselves. In the late 1990s, carriers borrowed heavily to lay fiber for traffic that was expected to arrive soon, and the borrowers were hit hardest when demand came later than planned. Our dot-com bubble timeline traces how that unfolded, and our guide to AI investment risks lists the financing risks to watch now.

The difference today is that the neoclouds' main customers are some of the richest companies in the world, and their contracts are signed in advance. The risk is less that demand vanishes than that it arrives on a different schedule from the debt payments. The same squeeze is visible one level up: Big Tech capex now exceeds its operating cash flow, as we covered in our report on Big Tech stock buybacks falling 83% and our analysis of AI capex and cash flow.