Alphabet said on 28 October 2026 that Google Cloud revenue rose to $30.7 billion in the third quarter from $15.2 billion a year earlier, and that the segment’s operating income rose to $11.1 billion from $3.6 billion.
By our arithmetic, Google Cloud added $15.6 billion of quarterly revenue in a year. Microsoft, reporting the same evening, put its total revenue for the same July to September quarter at $92.3 billion, up $14.6 billion from $77.7 billion.
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The key insight: By our arithmetic from Alphabet’s release, Google Cloud turned 48.4% of the revenue it added in a year into additional operating income, and its operating margin rose to 36.2% from 23.7%.
Update, 28 Oct: on the earnings call. Chief financial officer Anat Ashkenazi said third-party “bridging” capacity “came online only at the very end of Q3, and therefore had limited negative impact to our margin in the quarter.”
She said that “given the supply constraint environment, we started utilizing third-party compute capacity at the end of Q3 and will ramp usage in Q4,” adding: “We expect margin headwinds in the near-term as we utilize this capacity.” (Quotes from a caption transcript of the call webcast.)
Dividing segment operating income by segment revenue, Google Cloud’s operating margin was 36.2% in the third quarter, against 23.7% a year earlier. Both figures are our arithmetic from Alphabet’s release.
Across eight quarters of Alphabet’s own releases, the margin moved from 17.5% in October to December 2024 to 17.8%, 20.7%, 23.7%, 30.1%, 32.9%, 35.6% and 36.2%. Operating income has risen in each of those quarters, from $2.1 billion to $11.1 billion.
Alphabet’s release says Google Cloud generates product revenues primarily from the sale of TPU systems, and that TPU systems sales were a meaningful contributor to revenuegrowth in the quarter.
Segment operating margin, latest quarter vs the same quarter a year earlier: Google Cloud 23.7% to 36.2% and Microsoft Agents and Infra 53.1% to 52.8% (July to September 2025 vs 2026); AWS 32.9% to 39.4% (April to June 2025 vs 2026, its latest report). Margins are our arithmetic; the segments are not like-for-like. Sources: Alphabet Q3 2026 and Microsoft FY27 Q1 releases (28 Oct 2026); Amazon Q2 2026 release (30 Jul 2026).
48 Cents of Every New Dollar
Google Cloud segment operating income as a percentage of segment revenue, by quarter, Q4 2024 to Q3 2026: 17.5% to 36.2%. Margins are our arithmetic. Sources: Alphabet quarterly results releases.
Of the $15.6 billion of revenue Google Cloud added in a year, $7.5 billion became additional segment operating income. By our arithmetic, that is an incremental margin of 48.4%: about 48 cents of operating income for each extra dollar of revenue.
Microsoft now reports two segments, Agents and Infra and Devices and Consumer, and its release says prior periods were recast to the segment changes it announced in September 2026. Agents and Infra revenue rose to $76.8 billion from $61.7 billion and its operating income to $40.6 billion from $32.7 billion.
By our arithmetic, Agents and Infra’s operating margin was 52.8%, against 53.1% a year earlier, and its incremental margin was 51.8%: $7.8 billion of added operating income on $15.1 billion of added revenue.
Where AWS Stood at Its Last Report
Amazon’s second-quarter release of 30 July 2026 put AWS segment sales at $42.2 billion, up 37%, and AWS operating income at $16.6 billion, against $10.2 billion a year earlier. By our arithmetic, AWS’s operating margin was 39.4% in April to June 2026, against 32.9% a year earlier.
On those figures, Google Cloud’s third-quarter operating income of $11.1 billion equals about 67% of AWS’s second-quarter operating income, by our arithmetic. The two quarters are not the same period.
What Sits Outside the Segment
Alphabet does not charge all of its AI costs to Google Cloud. Its release reports an operating loss of $7.7 billion for “Alphabet-level activities”, against $4.5 billion a year earlier, and says these “primarily reflect expenses related to our shared AI research and development”.
What to Watch on 29 October
Amazon said on 15 October that it will hold its third-quarter 2026 results call on Thursday, 29 October 2026, at 2:00 p.m. Pacific time. AWS figures for July to September, the period covered by tonight’s Google Cloud and Microsoft numbers, have not yet been published.
As we read the segment tables, the margin gap between Google Cloud and Microsoft’s Agents and Infra narrowed to 16.6 points from 29.3 points a year earlier, by our arithmetic, because Google Cloud’s margin rose while Agents and Infra’s held near 53%.
By our arithmetic, Google Cloud’s incremental margin of 48.4% was close to Agents and Infra’s 51.8% on a similar amount of added revenue: $15.6 billion against $15.1 billion.
Alphabet’s release says Google Cloud’s product revenues come primarily from the sale of TPU systems, and it reports a $7.7 billion operating loss for Alphabet-level activities outside the segments, which it says primarily reflect shared AI research and development.
Sundar Pichai, CEO of Google and Alphabet, Q3 2026 release, 28 October 2026
“Google Cloud revenues grew 103%, powered by huge demand for our AI infrastructure and AI solutions”
Three Implications
FOR GOOGLE CLOUD Segment operating income was $11.1 billion in the third quarter, about three times the $3.6 billion of a year earlier, by our arithmetic from Alphabet’s release.
FOR MICROSOFT Agents and Infra’s operating margin was 52.8%, against 53.1% a year earlier, by our arithmetic from Microsoft’s release.
FOR AWS Amazon will hold its third-quarter call on 29 October, according to its 15 October announcement; AWS’s margin was 39.4% in April to June, by our arithmetic.
The Business Engineer Lens
This story maps onto the Business Engineer framework The AI Capex Map.
The framework argues: “This is not a continuation of the cloud capex cycle.” It describes the subject of its analysis as the financing: how the money flows, where it cracks, what it buys and who can absorb it.
The segment tables of 28 October show the revenue side of that question: Google Cloud’s operating margin rose to 36.2% while Microsoft’s Agents and Infra held at 52.8%, by our arithmetic. The framework does not discuss these figures.
What Is Not Established
The three segments are not like-for-like. Google Cloud includes Google Workspace and TPU system sales; Microsoft’s Agents and Infra is a broader segment than Azure; AWS’s latest reported quarter ends in June, not September. Each company also allocates costs to its segments differently.
The margins and differences here use only the segment tables in the companies’ releases. Any guidance given on the earnings calls is not included.
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Google Cloud’s third-quarter operating income was about three times its level a year earlier, and its operating margin rose to 36.2% from 23.7%, by our arithmetic. Microsoft’s Agents and Infra margin was little changed at 52.8%, and AWS stood at 39.4% in its latest reported quarter.
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A note on sourcing. Google Cloud figures come from Alphabet’s quarterly results releases, Q4 2024 to Q3 2026, the latest dated 28 October 2026 (SEC Form 8-K, Exhibit 99.1). Microsoft figures come from its fiscal 2027 first-quarter release of the same date (8-K, Exhibit 99.1). AWS figures come from Amazon’s second-quarter 2026 release of 30 July 2026 (8-K, Exhibit 99.1). Margins, differences and ratios are our arithmetic; linked earlier pieces carry their own sources.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
