A rise in borrowing costs hit expansion-stage data center stocks harder than the broader infrastructure sector, exposing the financing risk behind the market's enthusiasm for artificial intelligence capacity.
The source report recorded IREN down about 7%, with TeraWulf and Core Scientific each down roughly 5%. The Global X Data Center & Digital Infrastructure ETF fell only 0.4%, while the S&P 500 proxy was down 0.3%. These were intraday readings, but the gap suggests investors were distinguishing between diversified operators and companies still funding large projects before all of the associated revenue arrives.
IREN illustrates the trade-off. The company controls land, grid connections and a development pipeline that could support substantial AI computing capacity. Those assets are scarce and potentially valuable, but turning them into revenue requires GPUs, buildings, cooling systems and customer commitments.
The company's fiscal 2026 filing gives the financing concern more precision. IREN disclosed $3.6 billion of investment-grade GPU financing for a Microsoft contract at a 6% rate. It also disclosed $2.4 billion of financing led by Blue Owl and PIMCO for a Mackenzie expansion at a 9% fixed rate, covering 90% of the relevant GPU capital expenditure. The higher rate attached to the non-investment-grade customer deployment shows how customer quality and contract structure affect the cost of growth.
IREN also reported $128.8 million of fiscal 2026 AI Cloud Services revenue and $14 billion of cash, committed GPU financing and customer prepayments. That liquidity reduces immediate funding pressure, but it does not remove execution risk. Projects must still arrive on time, customers must perform, and financing costs must leave an acceptable return after operating expenses.
The original article linked the selloff to a 10-year Treasury yield near 5.3%. Rising benchmark yields can compress valuations and make incremental borrowing more expensive, but they do not prove that every project has become uneconomic.
Investors should compare contracted revenue and customer prepayments with the amount and price of capital committed to each deployment. Signed contracts can narrow the funding gap; equity issuance can widen dilution. For IREN, the central question is whether the revenue ramp arrives fast enough to justify the cost of building ahead of demand.