Anthropic has finally put public numbers behind one of the largest private-company growth stories in artificial intelligence.
The San Francisco-based Claude developer filed its Form S-1 with the Securities and Exchange Commission on Monday. The company intends to list Class A shares on Nasdaq under the symbol ANT, but the number of shares and the expected price range have not yet been set. Anthropic also confirmed the filing on its website.
The first-half numbers are extreme — in both directions
| Measure | H1 2025 | H1 2026 | What changed |
|---|---|---|---|
| Revenue | $1.163 billion | $16.286 billion | Up about 1,300% |
| Compute & infrastructure expense | About $2.33 billion | $8.945 billion | Compute spending scaled sharply with demand |
| Operating loss | $2.135 billion | $693 million | Operating loss narrowed despite rapid expansion |
| Net loss | $12.969 billion | $80.748 billion | Dominated by financing-instrument fair-value changes |
The most important distinction is between operating loss and net loss. Anthropic reported an $80.748 billion net loss for the first six months of 2026, but $72.388 billion of expense came from changes in the fair value of convertible notes, derivative liabilities and SAFEs. The filing says those changes were driven mainly by increases in the fair value of outstanding convertible notes as Anthropic’s enterprise value rose.
That does not make the charge irrelevant: it tells investors something important about the complexity and potential dilution embedded in Anthropic’s financing history. But it is not the same thing as saying the business burned $80.7 billion of cash in six months. The operating result was a $693 million loss, down from $2.135 billion in the comparable period.
Compute is already more than half of first-half revenue
Compute and infrastructure expense reached $8.945 billion in the first half, equal to roughly 55% of revenue. That ratio matters because Anthropic’s growth depends on continued access to expensive chips, data centers and cloud capacity even as model prices face competitive pressure.
The filing also shows how intertwined Anthropic is with the major cloud platforms. Sales through cloud-service-provider marketplaces represented about 48% of first-half 2026 revenue. Those platforms are distribution partners and infrastructure suppliers, while several also develop competing AI models.
Enterprise demand is no longer theoretical
As of September 30, Anthropic reported more than 11,900 customers generating at least $100,000 of trailing-12-month revenue, more than 1,900 generating at least $1 million and about 250 generating at least $10 million. Its top five customers accounted for roughly 25% of revenue in the nine months through September, although no single customer exceeded 10%.
That combination — rapid enterprise adoption alongside meaningful customer concentration — is one of the clearest questions public investors will have to price. The company is showing that demand exists at scale; the harder question is how much durable free cash flow that demand produces after compute, distribution, compensation and financing costs.
What investors should watch next
The preliminary prospectus does not yet contain the IPO share count or price range. Those terms, along with any updated financials and the eventual roadshow, will determine how the market translates Anthropic’s operating trajectory into an equity valuation.
For the broader AI market, the filing is useful because it replaces speculation with a measurable baseline: extraordinary revenue growth, materially improved operating economics, very large infrastructure costs and a capital structure that makes the headline GAAP loss unusually difficult to interpret without reading the components.
Markets & News distinguishes company claims, official disclosures and our analysis. This article may be updated if primary-source terms change.