AI Debt Panic Drags Down Neocloud Sector, Short Sellers Pocket $6 Billion This Month
nashnova research
Short sellers betting against Neocloud and data-center stocks have booked roughly $6 billion in paper profits this month, as markets reprice the sustainability of debt-fueled AI infrastructure expansion.
How much have the shorts made — and where?
According to ORTEX data, short interest across CoreWeave, IREN, Nebius, Applied Digital, and Core Scientific totals roughly $17 billion in shorted share value.
Short interest as a share of free float ranges from 20% to 26% — This means → roughly one in every four to five tradable shares has been borrowed and sold short, a highly concentrated bet.
Nebius generated the largest paper gain at roughly $2.94 billion this month; CoreWeave followed at about $1.7 billion.
Why are CoreWeave and Nebius the main battleground?
CoreWeave's short interest rose from 19.6% of float at the start of the month to 23.7%; the stock has fallen nearly 30% in that span.
Nebius short interest climbed from 15.4% at the start of 2026 to 20% — a steeper build-up.
Yet Nebius shorts are still sitting on roughly $3.33 billion in year-to-date paper losses. In plain terms = these bears were badly squeezed by earlier rallies and are only now clawing back losses — they are far from breaking even.
What about the other three names?
Data-center operators IREN and Applied Digital delivered a combined $1.2 billion-plus in paper profits for shorts.
Core Scientific short interest stands at 23.1% of float, but paper profits this month are only about $115 million. This means → the stock has dropped less, limiting the short-side payoff.
What does cheap borrow cost signal?
Stock-borrow fees for all five names are currently low.
In plain terms = shorting a stock requires borrowing shares first; borrow cost is essentially the "rent." When rent is cheap, shorts face little pressure to close positions and walk away.
This reflects a structural overhang — bears can hold their bets at minimal friction cost, keeping sustained downward pressure on valuations.
What is the market really worried about?
The core sell-off thesis: these Neocloud companies are heavily reliant on debt financing to fund AI expansion, and any shortfall in revenue growth would quickly surface as debt-service strain.
This reflects a broader shift — the market is moving from "AI narrative drives the valuation" to "can cash flow actually cover interest payments."
The scale of short positioning and the low cost of maintaining it suggest this skepticism is not event-driven but a structural challenge to the business model's sustainability.
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