Anthropic's revenue growth slows to 47% a quarter as compute costs jump 77%, amended S-1 shows

Anthropic filed an amended registration statement on Monday that adds the quarter the first S-1 left out. Revenue for the three months ended September 30 was $16.956 billion, according to the S-1/A on SEC EDGAR. That is more than the company has ever booked, and also the slowest sequential growth in the table. The price range and share count are still blank, so the filing does not yet say what the stock will cost.

The number behind the number: growth halved, costs did not

The filing's quarterly table lets you work out something the headline figures hide. Revenue went from $4.73 billion in the first quarter of 2026 to $11.56 billion in the second and $16.96 billion in the third. By our math that is growth of 144% in the second quarter and 47% in the third, after 132% in the first.

Over the same quarter, compute and infrastructure expense rose from $5.56 billion to $9.86 billion, up 77%. It took 48% of revenue in the second quarter and 58% in the third. The company says why: it took delivery of about $5.0 billion of compute under short-term commitments, which it describes as costing "significantly more" than compute bought under multi-year deals, and that reduced revenue per dollar of compute from the prior quarter.

The result on the income statement: an operating loss of $567 million, against operating income of $974 million in the second quarter. The filing attributes the swing to that $5.0 billion of short-term compute and $2.0 billion of non-cash charges tied to its donation matching program. On the company's own adjusted measure, operating income rose to $2.5 billion from $2.2 billion, but adjusted margin fell from 19% to 15%. Adjusted operating income is a non-GAAP figure the company defines in the filing, so read it as management's view.

The $104 billion loss is mostly an accounting entry

CNBC and others lead with a nine-month net loss of about $104 billion. The filing's quarterly figures add up to the same thing: $14.4 billion, $66.3 billion and $23.3 billion across the three quarters. But the company says $94.3 billion of that comes from changes in the fair value of convertible notes, derivatives and SAFEs, driven by a higher company valuation. That is a paper charge that grows as the valuation grows. The operating loss for the nine months was $1.3 billion, down from $5.2 billion a year earlier. Both numbers are real; they answer different questions.

The commitment that dwarfs the quarter

The larger number in the filing is $895.4 billion of purchase commitments and leases, substantially all for compute and infrastructure. Of that, about $447.5 billion is expected before the end of 2030, with most of the remainder between 2031 and 2045, and $69.8 billion falls due in the 12 months after September 30.

Put against revenue, $69.8 billion is about 1.03 times the third quarter's revenue annualized ($16.956 billion times four is $67.8 billion, our math). In other words, next year's committed bill is roughly the size of a full year at today's run rate. Against that the company lists $146.6 billion of liquidity: $95.6 billion in cash, $36.3 billion in short-term investments and $14.8 billion on its credit facility, before any IPO proceeds. It also says the build-out will be a significant use of cash for the foreseeable future.

Who this actually matters to

For traders, the thing to watch is the market's patience for the spending side of AI. CNBC notes that rising rates and weak free cash flow at the large cloud companies have already made investors wary of the buildout. A 47% quarter is extraordinary by any normal standard, but this filing prices a company that has committed to spend on the assumption that growth keeps compounding.

For business owners who run on Claude through an API or an app, the filing is a signal about supply. It says capacity was tight enough that the company paid up for short-term compute, and that it expects its own data-center leasing to become a growing share of supply. We found nothing in the filing about customer prices, and we are not predicting any change.

Concentration looks lower than many assume: no customer topped 10% of revenue in the nine months, the top five were about 25%, and about 79% of third-quarter revenue came from outside the top five, up from about 64% in the first quarter.

What to watch

• The next amendment: the price range, share count and the retail allocation that Bloomberg reported was under discussion (our earlier story).
• Fourth-quarter growth: the sequential rate after 47%, and whether the short-term compute cost recedes as long-term capacity arrives.
• The road show: CNBC reports it is about to begin.

Earlier coverage: the first S-1 and the October 15 preliminary figures. More on the stocks desk.

Disclosure: this article was drafted by an AI system built by Anthropic, the company it covers. Sources: Anthropic Form S-1/A on SEC EDGAR (filed Nov. 2, 2026); CNBC. Percentages and ratios are our calculations from the filing. This is market information, not investment advice.