AI in action · Markets
Microsoft Spent Less on AI, and the Neoclouds Paid for It
Microsoft's quarterly capex of $45.2 billion missed the $50.7 billion expected, and CoreWeave and Nebius fell almost 5% after hours. Their debt makes delays costly.
For most of the AI trade, a company spending less than expected would be good news for its shareholders. For the neoclouds, the specialised companies that buy Nvidia chips and rent computing power to bigger tech firms, it is a warning about revenue. When Microsoft reported on Wednesday, October 28, capital spending including finance leases of $45.2 billion for the quarter, up about 30% from a year earlier but below the $50.7 billion analysts had expected according to StreetAccount, CoreWeave and Nebius fell almost 5% in extended trading and IREN about 3%, CNBC reported.
The connection is direct. Microsoft signed a deal worth nearly $20 billion with Nebius for computing capacity through the 2030s and is one of CoreWeave's largest customers. A lower capex figure can mean Microsoft's infrastructure partners are taking longer to deliver data-centre capacity, which would push their revenue later while their debt costs keep running. Microsoft attributed the gap to the timing of payments and a lower mix of finance leases, and said it expects capex above $50 billion with spending rising in the second half of its fiscal 2027. Alphabet's capex of $51.36 billion also came in below the $55.09 billion expected.
The neoclouds were already on edge. On Monday, October 26, Elon Musk predicted that more than 200 neocloud companies will collapse, saying that "debt markets have almost entirely shut off access to money" for firms without substantial revenue outside AI, and the research firm Gartner projects that 80% of neocloud companies will be absorbed or cease operations by 2030. CoreWeave had risen 18% in the three sessions before Microsoft's report, to $63.93 at Wednesday's close, which left it exposed to any disappointment.
The business model explains the sensitivity. Neoclouds borrow heavily, often at floating rates and against the chips themselves, to buy hardware that they rent out on contracts of a few years, so their margins depend on keeping that hardware busy and refinancing on acceptable terms. Rising interest rates make the second part harder, and a customer that delays capacity makes the first part harder. Credit markets show the strain: CoreWeave's five-year credit default swaps were quoted around 1,090 basis points in October, far above the levels on its large customers.
Not everyone reads the miss as a turn in the cycle. Microsoft's Azure revenue grew 48%, faster than its capex, and Wolfe Research sees CoreWeave rebounding into the mid-$70s. But the episode shows where the AI spending chain is most fragile: at the companies that took on debt to sit between the chipmakers and the hyperscalers. A few billion dollars of spending timing at Microsoft is a rounding error for Microsoft; for the firms that depend on that spending, it moves the share price.
Sources: CNBC — CoreWeave and other neocloud stocks drop after Microsoft capex comes in below expectations (Oct 28, 2026); GuruFocus via Yahoo Finance — Why CoreWeave and Nebius shares are sinking after Microsoft earnings (Oct 29, 2026); Yahoo Finance — Why Are Investors Buying Credit Default Swaps to Hedge AI-Related Debt? (Oct 25, 2026)