Microsoft's stock has dropped about 20% in 2026 as investors fret over the company's hefty spending on artificial intelligence infrastructure, even as its cloud business Azure grows at near 40%. While demand remains strong, the concern is profitability: in the latest quarter, cloud revenue rose 30% but the cost of that revenue grew 47%, and capital spending jumped to $30.9 billion（約4.9兆円） from $16.7 billion（約2.7兆円） a year earlier. The key question now is whether Microsoft can stabilize margins and prove that its massive AI investment will generate stronger earnings.
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Microsoft's stock has fallen about 20% in 2026 as investors worry about the cost of the company's aggressive artificial intelligence spending. In the latest quarter, Intelligent Cloud revenue rose 30%, while cost of revenue grew 47%. Capital spending also climbed sharply, with Microsoft spending $30.9 billion（約4.9兆円） on property and equipment in the third quarter, up from $16.7 billion（約2.7兆円） a year earlier.
Why it matters
Azure continues to grow strongly with recent growth near 40%, so demand is not the issue. The problem is that Microsoft Cloud gross margin has been falling as the company spends heavily on AI data centers and computing infrastructure. For investors, the stock's lower valuation may signal that some of those profitability concerns are already priced in.
What to watch
The next critical test is whether Microsoft can stabilize cloud margins and demonstrate that its AI spending is turning into stronger earnings growth.
Microsoft's 2026 stock decline reflects a classic investor dilemma: strong top-line growth masking margin pressure. Azure's near-40% growth demonstrates robust demand for cloud services, yet the 47% cost-of-revenue growth in the latest quarter signals that infrastructure investments are outpacing revenue expansion. The company's capital spending surge—nearly doubling year-over-year to $30.9 billion（約4.9兆円）—underscores the scale of its AI data center and computing commitments.
The body indicates that the stock's lower valuation may already reflect some of these profitability concerns, suggesting the market has partially priced in the near-term margin headwinds. Whether Microsoft can stabilize cloud gross margins while maintaining growth will determine whether investors regain confidence. The company must demonstrate that its heavy upfront AI spending is a transitional cost that will eventually translate into outsized earnings, not a structural drain on profitability.
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