Yields on CoreWeave's 2032 bonds surged to 15% on Oct. 14, 2026, dragging down bitcoin miners that rent out computing power to artificial intelligence customers. The yield to maturity on the company's 9.625% note due in 2032 sat at 14.8%.
TeraWulf, Core Scientific, and Hut 8 all dropped by double digits, with Cipher Digital and IREN close behind.
The CoinShares Bitcoin Mining ETF fell 10.7%, far more than bitcoin itself, which slipped 1.9%.
The Nasdaq Composite lost 1.9% on the day, and server maker Dell cratered 11% after analyst downgrades citing slow enterprise AI adoption.
Borrowed money built the AI data centers
Miners that pivoted to AI hosting financed their buildouts with debt, so the cost of borrowing is a direct operating cost.
Filing data shows IREN carrying $7.59B of debt against $5.90B of cash, while Core Scientific reported $4.30B of debt and $1.77B of cash.
TeraWulf posted negative free cash flow of $2.50B over the trailing 12 months.
Investors view CoreWeave's balance sheet as relatively weak against peers because of heavy borrowing for data center construction.
Tech investor Chamath Palihapitiya flagged the rising yields publicly, drawing a one-word reply "Yikes" from Elon Musk.
Inflation made the debt problem worse
Consumer prices rose 3.7% annually in September, above forecasts, according to the Bureau of Labor Statistics.
Treasury yields climbed on the report, reviving expectations that the Federal Reserve could raise rates again rather than cut.
Bitcoin slipped below $82K after the data landed.
Higher yields raise refinancing costs for every operator that leaned on credit markets to buy chips and build facilities.
Hyperscalers are on track to spend $800B this year on AI infrastructure, and much of the supporting capacity sits with smaller, leveraged providers.
Gartner forecasts that more than 80% of neoclouds, the specialist AI compute providers, won't remain independent by 2030.
Nebius, another neocloud operator, dropped 10% in the same session.
The selloff marked the first real stress test of a financing model that assumed cheap capital would stay cheap.
