Anthropic’s revenue was $17.0 billion for the three months ended 30 September 2026, up 1,127% from a year earlier, according to an amended Form S-1 the company filed with the SEC on Monday, 2 November. The filing’s quarterly table puts third-quarter revenue at $16,956 million, against $1,382 million a year earlier and $11,555 million in the second quarter.
The same filing shows an operating loss of $567 million and a net loss of $23.3 billion for the quarter, most of it from a non-cash charge on convertible notes. At the third-quarter pace, revenue would run at about $67.8 billion a year, by our arithmetic.
The key insight: Anthropic’s amended S-1 puts third-quarter revenue at $17.0 billion, up 1,127%, with an operating loss of $567 million that it attributes mainly to short-term compute and donation-matching charges; 94% of the $23.3 billion net loss is a fair-value charge, by our arithmetic.
The filing says Claude’s adoption is shown by “revenue growing from $0 at commercial launch in the first quarter of 2023 to $17.0 billion for the three months ended September 30, 2026”.
For the nine months to 30 September, revenue was $33.2 billion, up from $2.5 billion a year earlier, the filing says. Consumption-based and subscription-based revenue grew by $24.2 billion and $6.5 billion respectively over that period.
Third-quarter revenue was 47% higher than in the second quarter, by our arithmetic from the filing’s quarterly table. The filing says revenue grew 1,127% year over year in the quarter, while compute and infrastructure expenses grew 382%.
Anthropic reported more than 11,900 customers with $100,000 or more of revenue on a trailing-twelve-month basis as of 30 September, up from more than 950 a year earlier, and Net Revenue Retention of approximately 900%. The filing says “our top five customers represented approximately 25% of our revenue for the nine months ended September 30, 2026”.
Anthropic’s quarterly revenue and compute and infrastructure expense, first quarter of 2025 to third quarter of 2026, in millions of dollars (unaudited). Source: Anthropic PBC, Form S-1/A filed with the SEC on 2 November 2026.
From an Operating Profit to an Operating Loss
The filing shows operating income of $974 million in the second quarter and an operating loss of $567 million in the third. Anthropic says the swing was “primarily driven by $5.0 billion of compute under short-term commitments, which currently costs significantly more than comparable compute procured under our multi-year commitments, and $2.0 billion of non-cash charges related to our donation matching program”.
Compute and infrastructure expense was $9,863 million in the quarter, or 58% of revenue, up from 48% in the second quarter, according to the filing’s percentage-of-revenue table. Adjusted Operating Income, a non-GAAP measure, rose to $2.5 billion from $2.2 billion, while Adjusted Operating Margin fell to 15% from 19%, the filing says.
Why the Net Loss Is $23.3 Billion
The quarterly table shows a net loss of $23,291 million, including a $21,936 million charge for the change in fair value of convertible notes, derivative liabilities and SAFEs. That charge is 94% of the quarter’s net loss, by our arithmetic.
The filing says these changes “were primarily driven by an increase in the fair value of our outstanding convertible promissory notes resulting from an increase in our enterprise valuation during each of the respective periods”.
$895.4 Billion of Commitments, Mostly Compute
The filing says Anthropic has entered into purchase commitments and lease agreements, including short-term commitments and leases not yet commenced, with an aggregate committed spend of approximately $895.4 billion, “substantially all of which is related to compute and infrastructure”. These are Anthropic’s own spending commitments, not customer contracts.
About $447.5 billion is expected to be incurred before 31 December 2030 and about $69.8 billion is due in the 12 months after 30 September, the filing says. The total is about 13 times the $67.8 billion annualised revenue figure above, by our arithmetic.
As of 30 September, Anthropic had cash and cash equivalents of $95.6 billion, $36.3 billion of short-term investments and $14.8 billion available under its credit facility, according to the filing.
As we read the filing, the operating line and the net line tell different stories: the $567 million operating loss follows Anthropic’s own explanation of short-term compute costs, while the $23.3 billion net loss is mostly the convertible-note charge the filing ties to its rising valuation.
As we read the commitments, the $895.4 billion is Anthropic’s own purchase and lease obligations, about 13 times the third-quarter revenue pace by our arithmetic, set against $95.6 billion of cash and cash equivalents.
Anthropic’s amended Form S-1
“revenue growing from $0 at commercial launch in the first quarter of 2023 to $17.0 billion for the three months ended September 30, 2026”
Three Implications
FOR IPO INVESTORS The filing shows unaudited quarterly figures through 30 September, including an operating loss of $567 million after operating income of $974 million in the second quarter.
FOR COMPUTE SUPPLIERS The filing says about $69.8 billion of Anthropic’s commitments are due in the 12 months after 30 September, substantially all of the $895.4 billion related to compute and infrastructure.
FOR ENTERPRISE BUYERS The filing reports more than 11,900 customers with $100,000 or more of trailing-twelve-month revenue and says its top five customers made up approximately 25% of nine-month revenue.
The framework says: “Inference is a revenue engine: continuous, distributed across millions of applications and agents, incurring marginal cost with every query.”
As we read it, Anthropic’s filing shows both sides of that line in one quarter: revenue of $17.0 billion and compute and infrastructure expense of $9,863 million. The framework is the owner’s argument and does not discuss this filing.
Why a few large customers can carry a big share of revenue, and what that means for risk.
What Is Not Established
The quarterly figures are unaudited, as the filing states. The $67.8 billion is our annualisation of one quarter, not a company forecast, and the 13-times comparison sets multi-year commitments against one quarter’s pace. The filing does not say which customers make up the top five.
This Week In The AI Supercycle
Anthropic’s Reality Check, The Capital Squeeze, & The New World Order
This week’s issue: for two years the AI build-out was priced as a growthstory. This week it started being priced as a credit story.
Anthropic’s amended S-1 shows third-quarter revenue of $17.0 billion, up 1,127% year over year, an operating loss of $567 million that it attributes mainly to short-term compute and donation-matching charges, and a $23.3 billion net loss driven mostly by fair-value changes on convertible notes. It also lists about $895.4 billion of committed spend, substantially all on compute and infrastructure.
A note on sourcing. All figures and quotations are from Anthropic’s amended Form S-1 filed with the SEC on 2 November 2026; quarterly figures are unaudited. The $67.8 billion annualised figure, the 47% quarter-on-quarter rise, the 94% share of the net loss and the 13-times comparison are our arithmetic.
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.
