Microsoft stock (NASDAQ: MSFT) plunged over 11% on Thursday despite beating Wall Street on revenue and earnings in the second quarter.
The sharp sell-off came despite a record surge in AI capital spending.
But, investors seem more concerned about the modest cloud growth that raised serious questions about timing and returns on its massive infrastructure bet.
The Microsoft stock dropped more than 7% in after-hours trading on Wednesday and fell over 11% as the markets opened on Thursday.
For a company that has beaten earnings five straight quarters, this reaction signals that Wall Street’s appetite for “beats” has fundamentally shifted.
AI CapEx: The bill comes due
The central tension is around Microsoft’s spending of $37.5 billion on capital expenditures in the October-December quarter alone, a staggering 66% year-over-year increase and roughly $3 billion higher than expected.
About two-thirds of that spending went to GPUs and other compute chips for data centers.
In just the first two quarters of fiscal 2026, Microsoft has already invested $72.4 billion in infrastructure, more than Amazon spent annually on capex in most years.
Management framed this as long-term positioning. CEO Satya Nadella told investors:
We are only at the beginning phases of AI diffusion across the enterprise.
CFO Amy Hood emphasized that not all capex flows to Azure, as some funds are internal AI products like Copilot for Microsoft 365, GitHub Copilot, and Copilot Security.
Yet that explanation didn’t ease investor nerves about near-term returns. The real issue: Microsoft is spending massive amounts now on infrastructure it may not fully monetize for months or years.
Azure growth: Barely enough to beat
Here’s where investor disappointment crystallized.
Azure cloud services grew 39% in the quarter, solid by any normal measure, but it only narrowly exceeded the expected 38.8%, a whisper-low margin of comfort.
Management guided Azure to grow 37%-38% next quarter, suggesting deceleration from the current run rate.
For a cloud business that commands premium valuations precisely because of rapid expansion, that’s a red flag.
Morgan Stanley’s Keith Weiss, the research head covering software, made the blunt case:
Capex is growing faster than we expected, and maybe Azure is growing a little bit slower than we expected.
Weiss dropped Microsoft from his “Top Pick” list, a signal that even bullish analysts see the trade-off as problematic.
Goldman Sachs cut its price target to $600 from $655, citing “higher capex without faster Azure acceleration.”
The new bar: Margin risk
Microsoft crossed $50 billion in quarterly cloud revenue for the first time and boasts a $625 billion backlog of future revenue.
On paper, the business looks pristine, but the market reaction tells you otherwise. Rich valuations become liabilities when growth stalls or investment intensity accelerates.
Investors want to see capex flatlining or declining as new data centers come online, while Azure accelerates.
Instead, they see capex rising alongside merely adequate cloud growth, exactly the opposite signal.
Microsoft has to prove the AI gamble transforms into operating leverage, not just balance sheet depreciation.
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