Anthropic, the company behind the AI assistant Claude, filed its public IPO prospectus with the U.S. Securities and Exchange Commission on Monday, October 26, 2026. The filing, known as a Form S-1, is the first time the public can read the company’s own account of its business, its fast-growing revenue, and its very large losses. Anthropic plans to list its Class A shares on the Nasdaq Global Select Market under the ticker symbol “ANT.” No share count and no price range have been set yet, so there is still no date for the first day of trading. Here is what the filing confirms, what it leaves open, and what to watch next.
What we know / What we don’t know
What we know
- Anthropic, PBC filed a public Form S-1 with the SEC on October 26, 2026. The filing appears on the SEC’s EDGAR system under accession number 0001628280-26-067168.
- Anthropic plans to list Class A common stock on the Nasdaq Global Select Market under the symbol “ANT,” according to the prospectus cover.
- The prospectus reports revenue of $16,286 million (about $16.3 billion) for the six months ended June 30, 2026, up from $1,163 million in the same period of 2025.
- The prospectus reports a net loss of $80,748 million (about $80.7 billion) for the same six-month period. Most of that loss — $72,388 million — comes from a change in the fair value of convertible notes, derivative liabilities, and SAFEs, which is a non-cash accounting charge rather than cash spent.
- The company’s operating loss for the first half of 2026 was much smaller: $693 million, on total operating expenses of $16,979 million. The biggest operating cost was compute and infrastructure, at $8,945 million.
- Anthropic confidentially submitted a draft of the filing to the SEC on June 1, 2026. A public filing is required at least 15 days before a company can start its investor roadshow.
- The prospectus leaves the number of shares to be sold and the price range blank. That means the offering size, the valuation, and the trading date are not yet decided.
- CNBC and Bloomberg both reported the filing on the morning of October 26, 2026, with CNBC running live updates on the prospectus.
What we don’t know
- How many shares Anthropic will sell, and at what price. Those details will appear in a later amendment to the prospectus.
- What valuation the market will put on the company. Press reports have mentioned figures from about $1.5 trillion to about $2 trillion, but those are reports, not terms in the filing, and they disagree with each other.
- How much money the offering will raise. A report cited by several outlets mentions up to $100 billion in proceeds, but the filing itself does not state a proceeds figure yet.
- When the roadshow and the first day of trading will happen. Reports point to a roadshow starting the week of November 9, but Anthropic has not confirmed a date. Under the 15-day rule, a filing on October 26 means a roadshow could not start before November 10.
- Whether market conditions will hold up long enough for the deal to go ahead on that timetable. The filing itself says the offering will depend on market conditions and other factors.
Key facts
- Company: Anthropic, PBC (maker of the AI assistant Claude)
- Filing: Form S-1, filed with the SEC on October 26, 2026
- SEC accession number: 0001628280-26-067168
- Planned listing: Nasdaq Global Select Market, ticker “ANT”
- Shares to be sold: Not yet set (left blank in the prospectus)
- Price range: Not yet set
- Revenue, first half of 2026: $16,286 million (about $16.3 billion)
- Revenue, first half of 2025: $1,163 million
- Net loss, first half of 2026: $80,748 million (about $80.7 billion)
- Of which: non-cash fair-value charge: $72,388 million
- Operating loss, first half of 2026: $693 million
- Revenue, full year 2025: $4,585 million
- Prior confidential draft submitted: June 1, 2026
What an S-1 is, in plain terms
An S-1 is the main document a company must file before it can sell shares to the public in the United States. Think of it as the company’s full introduction to future shareholders: what it sells, how it makes money, what it spends, what risks it faces, and who controls it.
Until October 26, Anthropic’s filing existed only as a confidential draft. That meant reporters and investors could quote from leaked or privately shared copies, but the public could not read the document itself. That public filing changes that. Anyone can now open the prospectus on the SEC’s EDGAR website and check the numbers directly.
This step does not mean Anthropic is already a public company, and it does not mean shares are on sale. The SEC must declare the registration effective, the company must set a price, and it must run a roadshow — a series of meetings where it presents the deal to large investors. Only after those steps can trading begin.
The headline numbers, and why the loss needs context
The two numbers getting the most attention are revenue of about $16.3 billion and a net loss of about $80.7 billion, both for the first six months of 2026.
The revenue growth is striking on its own. Anthropic reports $41 million in revenue for 2023, $386 million for 2024, and $4,585 million for all of 2025. The first half of 2026 alone — $16,286 million — is more than three times the whole of 2025. In other words, the business is growing very fast.
The loss needs more care. A net loss of $80.7 billion sounds like the company spent $80.7 billion in cash. The filing shows something different. Of that total, $72,388 million comes from a change in the fair value of convertible notes, derivative liabilities, and SAFEs — financial instruments whose accounting value moves as the company’s own estimated value rises. When a fast-growing private company becomes more valuable, the accounting value of those instruments can rise sharply, and that rise shows up as a loss on paper even though no cash left the bank.
The operating side of the business tells a calmer story. Anthropic’s operating loss for the first half of 2026 was $693 million — a loss, but far smaller than the headline figure. Its biggest real cost was compute and infrastructure, at $8,945 million, which is the price of the computing power needed to train and run AI models. Personnel costs were $3,152 million, and sales, marketing, and partnerships cost $3,168 million.
Readers should still keep one caution in mind: the filing covers only the first half of 2026. It does not show the third quarter, and the company itself warns that six-month results are not necessarily a guide to the full year.
Why this IPO matters beyond one company
Anthropic would be the first leading AI lab — a company whose main product is advanced AI models — to list its shares in the United States. That is why the filing is being watched far beyond the usual circle of IPO watchers.
First, it puts a public price tag on the AI boom. For years, the value of companies like Anthropic has been set in private funding rounds, where only a small group of investors takes part. A public listing lets ordinary investors see the price the market sets, and it gives the whole AI sector a new benchmark.
Second, it tests how much appetite investors still have for AI stocks. Recent weeks have brought fresh debate about whether AI valuations have run too far, too fast. A deal of this size — with reports of up to $100 billion in proceeds — will show whether large investors are still willing to pay up for AI growth.
Third, the filing opens up Anthropic’s business model to public scrutiny. The prospectus describes heavy reliance on a small number of large customers and partners, including Amazon and Google, which are both investors and providers of computing capacity. It also describes very large multi-year commitments for computing power, chips, and data centers — reported at more than $600 billion over several years. Those commitments are a key question for anyone trying to judge whether the growth can last.
The unusual ownership structure
One detail that stands out in the filing is how Anthropic plans to keep control after going public. The company’s seven co-founders are set to hold about 50.1% of the voting rights through a special share structure, according to press reports on the prospectus. In addition, a long-term benefit trust made up of people who are not shareholders would be able to appoint and remove a majority of the board.
In plain terms, that means public shareholders would own a large part of the economics of the company but have limited power to change its direction. That kind of structure is not new in tech — several large tech companies have similar setups — but it matters for anyone thinking about what buying a share would actually buy: a claim on future profits, with less say over the company than a normal shareholder might expect.
What happens next
The next steps follow a familiar sequence, but the dates are not yet fixed:
- Amendments. Anthropic will file updated versions of the prospectus that fill in the blanks: the number of shares, the price range, and updated financial details.
- Roadshow. The company will meet large investors to present the deal. Reports point to the week of November 9, but that is not confirmed, and the 15-day rule means it cannot start before November 10.
- Pricing. Near the end of the roadshow, Anthropic and its banks will set a final price.
- Trading. Shares would then start trading on Nasdaq under the ticker ANT. Reports have pointed to a listing in mid-to-late November, possibly before Thanksgiving on November 26, but no date is confirmed.
Any of these steps can slip. Market falls, weak investor demand, or new disclosures can delay or reshape a deal. The filing itself is a step forward, not a finish line.
What this is not
This article is not investment advice, and it does not recommend buying or selling any security. No price has been set, no shares are on sale, and the valuation figures in press reports are unconfirmed. Readers who want to follow the deal should watch for the amended prospectus on SEC EDGAR, where the share count and price range will appear first.
Sources
- U.S. Securities and Exchange Commission, EDGAR: Anthropic, PBC, Form S-1 filed October 26, 2026 (accession no. 0001628280-26-067168) — https://www.sec.gov/Archives/edgar/data/2130357/000162828026067168/anthropicpbc-sx1.htm
- CNBC, “Anthropic files SEC prospectus, bringing AI lab a step closer to historic offering: Live updates,” October 26, 2026 — https://www.cnbc.com/2026/10/26/anthropic-ipo-live-updates-ai-s-1-filing.html
- Bloomberg, “Anthropic Files for IPO to Become First Frontier AI Lab to List,” October 26, 2026 (via Google Trends RSS news item)
- Company announcement reporting via Runtime Wire, “Anthropic files IPO S-1, plans Nasdaq listing under ANT,” October 26, 2026 — https://runtimewire.com/article/anthropic-files-ipo-s-1-plans-nasdaq-listing-under-ant
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