Anthropic IPO: S-1 Shows a $17B Quarter and an $895B Compute Bill

The Anthropic IPO is the biggest test yet of what public investors will pay for an AI lab, and the amended filing gives them a third quarter of numbers to work with. Anthropic reported roughly $17 billion of revenue in the September quarter, up about 1,127% from a year earlier, CNBC reported, but sequential growth slowed to about 47% from 144% in the June quarter. The same filing lists about $895.4 billion of committed spending, substantially all of it on compute and infrastructure.

That pairing is the whole AI bubble debate in one document: revenue that grew more than tenfold in a year, set against spending promises that dwarf it. Anthropic filed the amended S-1 on November 2, a week after its first public prospectus, and plans to list on Nasdaq under the ticker ANT. No price range or share count has been set.

$17.0B

Q3 2026 revenue

47%

Growth over Q2, down from 144%

$895.4B

Committed spending, mostly compute

$69.8B

Of that, due in the next 12 months

Revenue is huge, and compute is growing faster

The first prospectus showed $16.3 billion of revenue in the first half of 2026, up from $1.2 billion a year earlier and already well above the $4.6 billion Anthropic booked in all of 2025. Quarter by quarter, revenue went from about $4.7 billion in the first quarter to $11.6 billion in the second and $16.96 billion in the third. Nine-month revenue reached $33.24 billion.

The cost side moved the other way in the third quarter. Compute and infrastructure expense rose to $9.86 billion from $5.56 billion, a 77.5% jump, according to a breakdown of the filing by BeInCrypto published on Yahoo Finance. That works out to about 58 cents of every revenue dollar going to compute, up from 48 cents in the second quarter. Total operating expenses rose $6.94 billion, more than the $5.40 billion rise in revenue.

The result was an operating loss of more than $500 million in the September quarter (Yahoo Finance put it at $536 million, BeInCrypto at $567 million), after an operating profit of $974 million in the June quarter. Both outlets tie the swing to two items: about $5 billion of compute bought under short-term commitments and about $2 billion of non-cash charges from a donation matching program. The headline net loss of $23.29 billion is mostly an accounting item: about $21.94 billion came from fair-value changes on convertible notes and related instruments, BeInCrypto reported.

Growth slowed from 144% to 47% in one quarter

A 47% gain in three months would be extraordinary for almost any company. For a stock that will be priced on how long hypergrowth lasts, the change in pace matters more than the level. Anthropic's sequential growth has swung widely, which is part of why investors are struggling to agree on a value.

Growth has bounced back before. It rose to 132% in the first quarter from 48% in the fourth quarter of 2025, after a new model launch, BeInCrypto noted. Price cuts and contractual discounts trimmed about $600 million from the third quarter's revenue gain, according to the same analysis, so part of the slowdown was a choice to lower prices rather than a drop in usage. Customer data in the first filing points the same way: more than 11,900 customers were spending at least $100,000 a year by September, including more than 1,900 spending at least $1 million, Built In reported.

The $895 billion question

The commitments are what turn the Anthropic IPO into a story about the whole AI build-out. Of the $895.4 billion of committed spending, about $69.8 billion falls due within the next 12 months and about $447.5 billion before the end of 2030, with the rest running from 2031 to 2045, Yahoo Finance reported. The 12-month slice alone is nearly double the $35.28 billion of revenue Anthropic booked over the past four quarters.

Those commitments are also other companies' revenue. The first prospectus described deals with Google, Amazon, Broadcom, AMD and several neoclouds, and an agreement with SpaceXAI to spend up to $120.5 billion over terms extending into 2029, according to Yahoo Finance. That is the same web of supplier and customer ties we looked at in our analysis of AI circular deals, and it is why the neocloud lenders in our neocloud debt analysis depend on labs like Anthropic paying their bills.

There is a cushion. The first filing showed $131.7 billion of cash and short-term investments at June 30, according to Mostly Metrics, and operating cash flow of $3.9 billion in the first half, against negative $1.5 billion a year earlier, Built In reported. An IPO would add more. Brett Winton of ARK Invest is among those who think the bills will be paid.

What an Anthropic IPO valuation would imply

The filing leaves valuation blank. Reports have put a possible Anthropic IPO valuation at $1.5 trillion to $2 trillion, Built In and Yahoo Finance reported, against a private valuation of $965 billion as of May. After an October investor day, some investors reportedly discussed a figure near $1.5 trillion rather than $2 trillion, BeInCrypto wrote. Goldman Sachs and Morgan Stanley lead the offering.

Governance shapes the price too. The seven co-founders hold a special Class F share that keeps 50.1% of the voting power, Built In reported, and Mostly Metrics counts five classes of common stock, including one held by the Long-Term Benefit Trust that elects a majority of the board. Public shareholders will own a piece of the economics but will not control the company.

OpenAI is the obvious comparison, and it is moving more slowly. It confidentially filed a prospectus in June but has signaled it is aiming for a 2027 debut, CNBC reported, and its latest private round came in well below its original target, as we covered in our OpenAI funding round report.

How the Anthropic IPO relates to the AI Bubble Index

Anthropic is private, so it is not in the AI Bubble Index basket, but its filing speaks directly to one part of it. The index read 63.5 at the November 2 close, in its Normal band, against 63.9 a week earlier. The demand family, which tracks whether AI revenue and usage are keeping pace with the money going in, reads 39.5, the lowest of the five families. Sentiment and attention, at 92.5, is the highest. Anthropic's revenue is evidence of real demand; its commitments are evidence of how much demand the build-out needs. The live readings are on the dashboard, and the method is on the methodology page.

Echoes of 2000, and the differences

A listing this large tests how willing public markets are to fund long-term spending. The late-1990s build-out ran on the same idea, that capacity built today would be filled by demand that arrived later. Our dot-com bubble timeline shows how that worked out for the companies that built the network.

The difference is that Anthropic already has tens of billions of dollars of revenue, positive operating cash flow in the first half and a large cash pile, which most dot-com issuers never had. The risk is narrower and more specific: that compute costs keep rising faster than revenue, as they did last quarter, while long-dated commitments stay fixed. Our guide to AI investment risks covers how that kind of exposure spreads through suppliers and lenders.