Announced 26 Oct 2026 · Sources checked
What the filing says
Anthropic filed its public prospectus paperwork on 26 October 2026. The {{company}} announcement, published at anthropic.com/news/s1-sec, confirms a Form S-1 with the SEC and a plan to list Class A common stock on the Nasdaq Global Select Market under the ticker ANT. Anthropic says the number of shares to be offered and the price range for the offering have not yet been determined.
The company is a public benefit corporation, so the filing name is Anthropic PBC. The statement describes the offering as proposed, meaning nothing can be sold until the registration becomes effective. Anthropic left the size of the deal open and did not publish a target valuation.
The announcement also names the firms that will help sell the stock. It says copies of the preliminary prospectus, when available, may be obtained from Goldman Sachs & Co. LLC in New York or Morgan Stanley & Co. LLC in New York. CNBC's live coverage identified Goldman Sachs as the lead left underwriter on the deal.
What the numbers show so far
The S-1 also exposes Anthropic's finances in a way the private company never has. CNBC's live coverage of the filing reports that Anthropic booked $16.29 billion in revenue in the first half of 2026 with $2.38 billion in cost of revenue as of 30 June 2026, implying a gross margin of about 85%. That is the same revenue figure that surfaced in earlier draft-filing reports AI Lookout covered in our story on Anthropic's draft IPO filing.
The picture is less flattering underneath the top line. Net income remained deeply negative for the first half of the year, consistent with the $80.7 billion net loss that earlier reports attributed to the draft prospectus, and the S-1 warns that operating margins will fluctuate. CNBC notes that substantially all of Anthropic's cost of revenue is compute and infrastructure cost.
Revenue is also concentrated in a few channels. CNBC reports that {{48}} percent of revenue in the first six months of 2026 came from Anthropic's relationships with Amazon Web Services, Google Cloud and Microsoft Azure, the same clouds that sell Claude to enterprise customers.
The compute bill behind the IPO
The most striking disclosures are about computing commitments. CNBC reports that Anthropic's filing shows about $417 billion in payment obligations to its compute providers, covering data centers, the equipment inside them and cloud services, with deals starting between 2026 and 2027 and lasting from under a year to up to 20 years. Anthropic also says it expects to spend at least $542 billion on data centers and cloud computing in the coming years.
The chip list is broad. The filing describes a compute pool spanning Nvidia GPUs, AMD GPUs, AWS Trainium chips and Google TPUs, treated as a single fungible pool that Anthropic routes work across. CNBC reports committed spending of $110 billion on Amazon Trainium through 2036 and $114.5 billion on Google TPUs through 2033, plus the ability to buy more than $20 billion in AMD chips, and long-term commitments with SpaceXAI, Nscale and Lambda for Nvidia hardware. All four chip and cloud partners hold stakes or options in Anthropic.
Anthropic says its four primary chip designers have large stakes or options to buy stakes in the company, a level of cross-ownership that is central to the story of AI capex. AI Lookout covered the earlier shape of that investment picture in our report on Anthropic's third-quarter revenue.
The risks the company chose to print
CNBC counts more than 90 pages of risk factors in the S-1, covering safety trade-offs, the compute forecast problem and a dispute with the U.S. government. Anthropic says it has underestimated its compute requirements in the past, which has affected product development and deployment plans.
The filing devotes serious space to Anthropic's fight with the Pentagon. CNBC reports Anthropic warns that ongoing issues with the U.S. Department of Defense could cause material revenue losses or business disruptions, dating back to the department labeling the company a supply chain risk and a February order to stop using its models. The company notes a federal court found the actions retaliatory and unconstitutional, and says it is evaluating next steps after an appeals court decision.
Anthropic also discloses the safety and election-safeguard work that has defined its public posture. Investors are being asked to price a company that put 'catastrophic risk' language in front of the market, alongside its growth numbers, in the same week the U.S. midterms approach.
What the filing means for the AI IPO race
Anthropic is trying to be the first big AI lab to reach the public market, ahead of OpenAI. The filing does not guarantee that order of events, but it puts a public prospectus in play while OpenAI is still reported to be working on a large private raise. AI Lookout covered the earlier revenue picture in our quarterly update on Anthropic's finances.
The timing also matters for investors who have been funding AI infrastructure through a handful of private companies. Anthropic's S-1 turns one of those balance sheets into a public document, and the compute commitments inside it are a direct read on how the frontier labs are spending.
Independent evaluators have already begun questioning the evidence Anthropic publishes about its own risk. A recent METR assessment found the company's risk low but its monitoring evidence weak, which AI Lookout covered here. The S-1 will be tested against that same standard by new scrutineers: the SEC, sell-side analysts and public shareholders.
What to watch next
The offering is not priced, so the first milestone is an effective registration and a preliminary prospectus with a share count and range. Until then the size of the deal is unknown, and headlines about valuation should be treated as speculation.
Watch the underwriter list as the deal firms up, the final risk-factor language, and how Anthropic frames its compute spending for public investors. The S-1 also confirms the ticker ANT, assuming the listing proceeds on the Nasdaq Global Select Market.
Finally, watch OpenAI. Anthropic's public filing raises the stakes for OpenAI's own choices, and the two companies' timing has become a competitive story in itself.
Common questions
When will Anthropic's IPO happen?
No date has been set. Anthropic filed its Form S-1 on 26 October 2026; the offering cannot proceed until the registration becomes effective, and the share count and price range are not yet determined.
How much is Anthropic raising?
The filing does not say. Anthropic states that the number of Class A shares to be offered and the price range have not been determined.
Who is underwriting the offering?
The announcement names Goldman Sachs & Co. LLC and Morgan Stanley & Co. LLC as contacts for the preliminary prospectus, and CNBC reports Goldman Sachs as the lead left underwriter.
Sources & further reading
How this story was made
Written by Kristian Kostov with AI assistance and checked against the linked sources. Company performance claims are attributed to the company. Analysis reflects AiLookout’s interpretation; we have not independently tested the products discussed. The cover places the companies’ own logos, taken from public-domain or openly licensed files credited in the caption, on a plain background. It is not a product photograph, a screenshot, or an endorsement.
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