Amazon, Microsoft each spending $200B on AI—investor patience wearing thin

Amazon and Microsoft are locked in an escalating cloud computing rivalry that has reached an unsustainable intensity. Each company is deploying roughly $200 billion（約32兆円） in capital expenditures this year to build data center infrastructure, an unprecedented level of investment designed to capture demand for AI services and forestall competitors like Google.

AWS currently leads with 28% of the cloud market share, compared with Microsoft's 21%, though both companies control about half the market overall. AWS is projected to reach $168 billion（約27兆円） in net sales in 2026, up from $128.7 billion（約21兆円） last year—a 30.7% rise—with exceptional margins of 93.8% gross and 35.4% operating. Microsoft's Azure and cloud services are expected to reach $148.9 billion（約24兆円） in fiscal 2027, up about 40% from roughly $106 billion（約17兆円） in fiscal 2026, with an estimated operating margin of about 47%, though that figure includes higher-margin legacy server software. AWS carries $364 billion（約58兆円） in remaining performance obligations from signed customer contracts, excluding a recent $100 billion（約16兆円） deal with Anthropic, while Microsoft has $627 billion（約100兆円） in remaining performance obligations across its commercial business.

Amazon CEO Andy Jassy has told shareholders that the $200 billion（約32兆円） spending is not speculative. "We're not investing approximately $200 billion（約32兆円） in capex in 2026 on a hunch," he wrote, noting that AWS capex "much of which will be monetized in 2027–28, we already have customer commitments for a substantial portion of it." AWS Chief AI and Technology Officer Matt Wood told Fortune that "the more capacity we open up, we sell it immediately." Microsoft CEO Satya Nadella has defended the spending by pointing to three pillars: diverse customers (including OpenAI, Anthropic, and enterprise IT), strong utilization, and a long-term cost-of-ownership advantage. "We have OpenAI book, we have Anthropic book, but we want to also have the long tail of enterprise IT," Nadella said.

The financial strain is visible in both companies' cash flows. Amazon's free cash flow dropped to $1.2 billion（約1900億円） during the past 12 months from $25.9 billion（約4.1兆円） a year ago, and it has more than doubled its bond debt to more than $120 billion（約19兆円）. Microsoft, by contrast, is funding its buildout—roughly $35 billion（約5.6兆円） per quarter—from operating cash flow rather than issuing new debt, and its free cash flow for the 12 months ended in March was $73 billion（約12兆円）, slightly up year over year. Luke Rahbari, CEO of Equity Armor Investments, observed that capital allocation has become "a competitive bloodsport," with the winner being whoever can absorb the most capital and leave less for rivals. Investors will scrutinize this week's earnings reports from both companies—Microsoft on Wednesday, Amazon on Thursday—for signs of confidence or strain. Last week's 7% stock decline in Alphabet after the company raised capital-expenditure projections and reported negative free cash flow has heightened investor anxiety about whether the spending boom can deliver returns.

The rivalry between Amazon Web Services and Microsoft Azure has entered a new intensity driven by the AI boom. The two companies occupy roughly half the global cloud market—Amazon with 28% and Microsoft with 21%—and their strategies reflect different strengths: AWS appeals to startups and machine-learning workloads with flexibility and customization, while Azure leverages Microsoft's existing enterprise software ecosystem for easier adoption. In practice, large customers often purchase both services, making them less direct competitors than "frenemies" pursuing distinct customer cohorts.

What has changed is the scale of capital deployment. Each company is committing roughly $200 billion（約32兆円） to data center buildout in 2026, an unprecedented amount driven by the need to secure capacity and avoid being overtaken by rivals like Google. The tension for investors is acute: both companies must convert this spending into substantial returns within the next few years to justify the outlay. Amazon's free cash flow dropped to $1.2 billion（約1900億円） in the past 12 months from $25.9 billion（約4.1兆円） a year ago, while Microsoft has maintained stronger free cash flow of $73 billion（約12兆円）, though the two companies' financial structures make direct comparison difficult. Google's 7% stock decline last week after raising capital-expenditure guidance and reporting negative free cash flow has sharpened investor anxiety about whether any of these massive bets will pay off.

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