Key Highlights

● AI-cloud stocks retreated after Microsoft pointed to a lower capital-spending commitment.

● Microsoft's capex of $45.2 billion fell short of the roughly $50 billion expected.

● Microsoft blamed delayed third-party capacity and said Demand exceeds available supply.

● Alphabet suffered its worst day since its 2004 IPO, erasing about $500 billion.

Nebius Group (NASDAQ:NBIS) slid on Thursday as AI-cloud stocks retreated after Microsoft (NASDAQ:MSFT)'s Quarterly Report pointed to a lower capital-spending commitment than Wall Street had expected.

When the biggest customer spends less

For the companies that rent out artificial-intelligence computing power, few signals matter more than how much the tech giants plan to spend. On Thursday, October 29, that signal pointed the wrong way for Nebius.

The stock slid during the session as AI-cloud names fell after Microsoft pointed to a lower capital-spending commitment, according to one source. CoreWeave (NASDAQ:CRWV), another so-called neocloud provider, also declined.

Nebius is often grouped with CoreWeave as a neocloud: a company that builds data centers packed with high-end graphics processors and leases that capacity to AI developers and large technology firms. The Business depends on hyperscalers and AI labs continuing to pour money into computing power.

What Microsoft said

Microsoft reported its fiscal first-quarter results on Wednesday evening, beating forecasts for Revenue and earnings. But its Capital expenditures, including finance leases, came in at $45.2 billion, below the roughly $50 billion analysts had expected, according to market data.

Microsoft attributed the shortfall to delayed third-party capacity, according to media reports. Chief financial officer Amy Hood said customer demand "continues to exceed available supply."

That explanation cuts two ways for neoclouds. Delays in third-party capacity could mean slower near-term revenue for providers that Supply it. At the same time, demand running ahead of supply suggests the appetite for AI computing remains strong. On Thursday, the market focused on the lower number.

Financing worries in the background

One market commentary pointed to a wider concern hanging over the group: tight financial conditions for companies spending heavily on data centers. Building AI infrastructure requires enormous upfront investment, often funded with borrowed money.

Treasury yields remained elevated, though the 10-year yield eased on the day, and the Federal Reserve kept its focus on inflation. Fed Chair Kevin Warsh took a different view of overall financial conditions on Wednesday: "I'm unwilling and unable to call them tight."

The AI trade took a hit

Nebius's decline was part of a broader retreat from AI-linked stocks. Alphabet (NASDAQ:GOOGL) suffered its worst day since its 2004 IPO, erasing about $500 billion of market value, after a revenue miss and negative free Cash Flow revived concerns about AI spending. One report said the results "reignited concerns over mounting AI costs."

The Nasdaq Composite tumbled 365.13 points to 26,184.72, and the PHLX Semiconductor index ended a four-day winning streak. The S&P 500 slipped 23.59 points to 7,720.39.

Yet the broader market held up well. The Russell 2000 climbed 28.71 points to 2,859.22, and more than 400 S&P 500 members rose as investors rotated into health care, financials and real estate.

One market analyst said "markets are no longer rewarding companies simply for investing heavily in AI," according to media reports.

The bigger picture

Not everyone sees the buildout slowing. The chief executive of Vertiv (NYSE:VRT) said on Wednesday that the industry is "in the middle of the largest infrastructure buildout." Alphabet kept its 2026 capital-spending guidance of $195 billion to $205 billion, and Amazon (NASDAQ:AMZN) reaffirmed its $220 billion plan.

What to watch

The next signals for Nebius will come from the spending plans of its largest potential customers. Microsoft has guided to capital expenditures above $50 billion for its next quarter, and investors will track whether delayed capacity comes online.

Financing conditions matter too. The Fed's December 8–9 meeting, where markets lean toward a rate increase, will shape borrowing costs for capital-intensive AI infrastructure companies. Any updates from Nebius on contracts, capacity additions or funding will be closely watched.