An office building exterior in San Francisco at dusk

Anthropic has filed its prospectus. The company behind Claude submitted a Form S-1 to the U.S. Securities and Exchange Commission on October 26, 2026, and applied to list its Class A common stock on the Nasdaq Global Select Market under the symbol “ANT.” The filing follows a confidential draft submitted in June, and it turns months of leaked figures into a public document that investors, customers, and competitors can finally read for themselves.

The numbers that matter

The headline figures are dramatic in both directions. Revenue was $16.286 billion for the six months ended June 30, 2026, against $1.163 billion in the same period of 2025 — roughly 14 times higher year over year. Full-year revenue was $4.585 billion in 2025, up from $386 million in 2024 and $41 million in 2023, the year Anthropic launched commercially.

The net loss for the first half of 2026 was $80.7 billion. That number needs its footnote before it needs a reaction: $72.4 billion of it is a non-cash change in the fair value of convertible notes, derivative liabilities, and SAFEs, driven mainly by the rise in Anthropic’s own valuation. Strip that out and the operating loss was $693 million on $16.3 billion of revenue — still a loss, but a very different story from the headline.

The filing also quantifies Anthropic’s enterprise base: as of September 30, 2026, more than 11,900 customers each spent $100,000 or more over the trailing twelve months, up from more than 950 a year earlier, including about 250 customers spending $10 million or more. As of June 30, the company held $112.4 billion in cash and equivalents plus $19.3 billion in short-term investments. Whatever the debate about the AI boom’s sustainability, Anthropic is not arriving at the public market short of cash.

What the filing leaves blank

Just as telling is what the S-1 does not say. The price range, share count, total raise size, aggregate compute-commitment figure, and run-rate revenue as of October 31 are all unfilled placeholders, and the filing states no valuation. The registration statement has not yet become effective, so no shares can be sold until the SEC declares it so. Reports have pointed to a possible listing in the second half of November; the filing itself commits to no date.

Governance will also draw scrutiny. A Long-Term Benefit Trust elects a majority of the board through Class T stock, and a single Class F share held by a founders’ vehicle carries 50.1% of general voting power. Public shareholders, in other words, are buying economics and disclosure, not control. Anthropic has always presented that structure as a feature — a guardrail for its safety mission — and the IPO will test whether public-market investors price it as one.

Why this filing matters beyond Anthropic

This is the first time a frontier AI lab’s full finances have been laid out for public judgment. Private valuations, however large, are opinions shared by a small circle of investors; a public filing invites the whole market to disagree. The $16.3 billion revenue figure will be cited by AI optimists as proof the boom has real demand behind it. The $80.7 billion net loss will be cited by skeptics as proof the economics are still unproven. Both readings are available in the same document, which is precisely why the filing matters: it replaces narrative with numbers, even if the numbers still need interpretation.

For customers, the filing is also a diligence document. Companies building on Claude can now weigh Anthropic’s cash position, customer concentration, and compute commitments against their own dependency on the platform. For competitors, it sets a benchmark: OpenAI, still private, will now be measured against a public rival’s disclosed growth and margins whether it likes it or not.

The S-1 is a beginning, not a verdict. The price, the size, and the market’s reception are still to come. But the frontier AI business is no longer a private conversation. As of October 26, it is a public filing — and everyone gets to read it.

Sources: Value Add VC — “Anthropic files S-1: $16.3B H1 revenue, Nasdaq ticker ANT” (S-1 figures reviewed on SEC EDGAR); Decrypt — “Anthropic Makes IPO Filing Public, Plans Nasdaq Listing Under ‘ANT’”; Aju Press — “Anthropic Files for IPO, Aiming for Nasdaq Listing Ahead of OpenAI”; AI Notis — “Anthropic files S-1 for Nasdaq IPO, reporting $16.3bn half-year revenue”. Note: share count, price range, and listing date are blank in the filing; the mid-November timing is reported, not stated in the S-1.