Anthropic's S-1: $16.3 billion in revenue, an $80.7 billion loss, and a blank price

Anthropic filed its S-1 with the SEC on Monday, and the document's two headline numbers pull in opposite directions: $16.3 billion of revenue in the first half of 2026, and a net loss of $80.7 billion. Neither is the figure investors will actually have to underwrite. The same filing discloses between $542 billion and $567 billion of committed compute and infrastructure spending, much of it payable whether or not customers keep buying.

Why the $80.7 billion loss is closer to a valuation mark

Roughly $72.4 billion of that net loss is a non-cash charge for the change in fair value of convertible notes, derivative liabilities and SAFEs, which the S-1 attributes primarily to the rise in Anthropic's enterprise valuation. The accounting runs in both directions: a falling valuation would shrink the same line, so the loss tells you what investors thought the company was worth, not what it spent.

The operating numbers are less dramatic and more informative. The GAAP operating loss was $693 million for the six months to June, against $2.1 billion a year earlier, which Reuters reported alongside the filing. Adjusted operating income swung to $1.62 billion from a loss of $1.85 billion. That adjusted figure excludes stock-based compensation, non-cash charitable contributions and legal settlement expenses, and Anthropic also reported $3.9 billion of positive operating cash flow for the half, its first, according to Fortune's reading of the document. The obligations table later in the same document also excludes the principal of those convertible notes, on the grounds that they are expected to settle in shares rather than cash.

The growth is real, and its durability is the open question

Revenue went from $41 million in 2023 to $386 million in 2024 to $4.6 billion in 2025, then to $16.3 billion in six months, a 1,300% year-over-year increase the S-1 states plainly. Customers spending at least $100,000 on a trailing-twelve-month basis grew from more than 950 at the end of September 2025 to more than 11,900 a year later, and headcount went from about 940 at the end of 2024 to 5,300. More than half of the Fortune 500 and over 30% of the Global 2000 now clear that $100,000 threshold, Reuters reported from the filing.

Anthropic also reports net revenue retention of roughly 900% as of September 30. That is a company-defined measure on a young, enterprise-heavy customer base, and it mostly describes large accounts discovering new uses, not a mature cohort renewing. The filing itself warns that growth rates will decline and that its recent expansion may reflect "early-stage adoption dynamics" that prove unsustainable. Revenue is also consumption-based, and the S-1 concedes that much of it carries no long-term contractual commitment.

An obligation book that runs one way

Fortune puts the compute commitments at $542 billion to $567 billion: a $417 billion package signed on December 31, 2025, with terms of one to 20 years beginning in 2026 and 2027, plus $125 billion to $150 billion for capacity starting between 2028 and 2031. Much of it sits under take-or-pay terms that obligate Anthropic to pay for capacity it does not use.

The expense line is already large. Compute and infrastructure cost $8.945 billion in the first half of 2026, up 283% and equal to 55% of revenue; in 2025 the same line was $7.326 billion, or 160% of revenue. Against that, remaining performance obligations stood at $10.8 billion at June 30, about 75% of which the company expects to recognise within a year. The mismatch is the point: a multi-decade bill against a book of cancellable usage.

Anthropic's preferred metric is revenue per dollar of compute, which it puts at $2.08 for the second quarter of 2026 on $11.6 billion of revenue and $5.6 billion of spend. That ratio compares a quarter's revenue with a quarter's delivered capacity, while the commitment behind the capacity runs for up to 20 years.

Seven founders, 50.1% of the votes, and a trust that picks the board

Buyers of the Class A stock get one vote per share. A single share of Class F stock, issued to a limited liability company whose sole members are the seven co-founders, carries 50.1% of total voting power, including the election of directors. A single share of Class T stock, held by the Long-Term Benefit Trust, elects a majority of the board outright, and Class N shares carry no votes except where the law requires them. Anthropic is also a Delaware public benefit corporation whose charter names the responsible development of advanced AI as its purpose.

The safety rationale is stated in the filing, whose risk-factor section dwells on models that may show "unexpected strategic or self-preserving behaviors", including outputs "that could be interpreted as coercive, deceptive, or manipulative, including behavior resembling blackmail". The structure is also, separately, an unusually concentrated control package for a company of this size. The two facts are compatible, and shareholders are being asked to accept both at once.

No price, no share count, and a nervous market

The S-1 leaves the offer price and the number of shares blank, which is standard at this stage and still means the central number in the document is missing. Investors queried by Reuters put the valuation near $1.5 trillion, down from roughly $2 trillion a week earlier and against $965 billion in Anthropic's May round. The Wall Street Journal reported that the company is aiming for the week of November 16 and could raise about $100 billion at a valuation of $1.5 trillion to $2 trillion. The listing is on Nasdaq, under the ticker ANT.

The backdrop has tightened. Reuters describes Anthropic as standing alone in a fall listing market that was once expected to be crowded, after AI-linked equities sold off on doubts about debt-funded data centre spending. "Anthropic is entering an IPO market that is far more challenging than the summer," Matt Kennedy of Renaissance Capital told Reuters. Thomas Hayes of Great Hill Capital framed the same trade less diplomatically: "The offering is for the faithful."

What the first public quarter has to answer

Anthropic changed its expense presentation in 2025, dropping cost of revenue, gross profit, research and development and sales and marketing as separate line items in favour of categories like compute, personnel and partnerships. Gross margin, the number most software investors reach for first, cannot be computed from the income statement as filed.

What can be tracked is narrower and more useful: the contractual-obligations schedule, once it is priced; how much of the $542 billion to $567 billion is non-cancellable; how much revenue flows through cloud marketplaces run by Amazon, Google and Microsoft, which are simultaneously investors, suppliers and competitors; and whether the top five customers, about 25% of revenue in the first nine months of 2026, keep growing. No single customer exceeded 10% of revenue in that period, which is a genuine improvement on 2025, when two accounts each contributed 12%.

The quarterly figure Anthropic relayed to investors at its October 14 meeting — $16.8 billion, up 45% — sits outside the audited statements, which stop at June 30. It may well hold up. But an S-1 is a description of a business, and the two numbers that will decide this offering, the price and the durability of demand, are the two the document cannot supply.