Three major cloud providers—Microsoft, Alphabet, and Amazon—are posting accelerating growth and massive order backlogs, signaling that their heavy AI infrastructure spending is beginning to pay off.

What happened: Microsoft reported Intelligent Cloud revenue of $34.68 billion（約5.5兆円） (up 30% year over year) and Azure growth of 40%, with commercial remaining performance obligations at $627 billion（約100兆円）. Alphabet's Google Cloud grew 63% year over year to $20.03 billion（約3.2兆円） with backlog nearly doubling to over $460 billion（約74兆円）. Amazon's AWS revenue reached $37.587 billion（約6兆円） (up 28% year over year), its fastest growth in 15 quarters.

Why it matters: Each of these companies is deploying tens of billions of dollars per quarter on AI infrastructure—Microsoft's CapEx hit $30.88 billion（約4.9兆円） (up 84%), Alphabet is guiding 2026 CapEx of $175 billion（約28兆円） to $185 billion（約30兆円）, and Amazon planned near $200 billion（約32兆円） for full-year 2026—and the revenue acceleration suggests these investments are beginning to generate returns rather than simply burning cash. The contracted order backlog (totaling in the hundreds of billions across all three) provides visibility into future revenue.

What to watch: In July earnings, monitor whether Azure sustains growth above 35%, Google Cloud maintains triple-digit backlog growth, and AWS extends acceleration past 28%. If those numbers print, the AI CapEx cycle moves from speculation to demonstrated payback, and these three names lead the next leg.