Anthropic IPO: What the S-1 Filing Reveals and What Happens Next
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Not investment advice: This article is for information only. It is not investment, legal or tax advice, and it is not an offer or recommendation to buy or sell any security. IPOs can be volatile and you can lose money. Read the official prospectus and talk to a licensed professional before making decisions.
“Anthropic IPO” is one of the biggest tech searches in the U.S. on Google Trends this week (200K+ searches), with people also typing “anthropic s1,” “anthropic stock” and “ipo date.” The reason: the company behind the Claude AI models publicly filed to go public on Oct 26, and its paperwork gave the world its first official look at the numbers. Here is what the filing actually says, what is still unknown, and why the timing just got trickier.
At a glance
- The filing: Anthropic filed a Form S-1 registration statement with the SEC for its Class A common stock and plans to list on the Nasdaq Global Select Market under the ticker “ANT” (Anthropic announcement, S-1 on SEC.gov).
- Price and size: not set yet. Anthropic says the number of shares and the price range “have not yet been determined” and the registration is not yet effective.
- Banks: Goldman Sachs and Morgan Stanley are leading the deal (CNBC).
- Revenue: $16.29 billion in the first half of 2026, up from $1.16 billion a year earlier; $4.59 billion for all of 2025 (S-1).
- Losses: a $80.7 billion net loss in the first half of 2026, which CNBC says is mostly (about $72 billion) non-cash fair-value charges tied to convertible notes.
- Timing: by Yahoo Finance’s math, the earliest possible first trade is Monday, Nov 16. That is a calculation, not a confirmed date.
What the S-1 shows
An S-1 is the long document a company files before an IPO, laying out its business, finances and risks. Anthropic’s is the first time it has had to publish audited numbers. The key figures, from the S-1 and CNBC’s coverage:
- Fast growth: first-half 2026 revenue of $16.29 billion versus $1.16 billion in the first half of 2025. Revenue was $386 million in 2024 and $4.59 billion in 2025.
- Big customers: more than 11,900 customers paying $100,000 or more and more than 1,900 paying $1 million or more over the trailing twelve months, as of Sept. 30, 2026.
- Customers keep spending more: the S-1 puts net revenue retention at “approximately 900%” as of Sept. 30. That means existing customers, as a group, are spending about nine times what they spent a year earlier. CNBC notes the median for public cloud software companies is about 108%.
- How it gets paid: CNBC reports about 80% of revenue is consumption-based (paying per use) and about 20% subscriptions, and that 48% of revenue comes through cloud partners Amazon Web Services, Google Cloud and Microsoft Azure.
- Margins: CNBC calculates an 85% gross margin for the first half, up from 12% a year earlier, and reports a 10% adjusted operating margin (CNBC).
- Headcount: about 5,300 employees as of Sept. 30, 2026, up from about 940 at the end of 2024 (S-1).
The big unusual part: who controls the company
Anthropic is a public benefit corporation, which means it has a stated public purpose, “the responsible development and maintenance of advanced AI for the long-term benefit of humanity,” alongside making money (S-1). Its share structure keeps control away from ordinary public shareholders:
- Class A is the stock the public would buy.
- Class T is held by the Long-Term Benefit Trust, which CNBC reports elects a majority of the board.
- Class F is a single share held by an entity of the co-founders that, per CNBC, carries 50.1% of the voting power but no economic rights.
- Class E and Class N go to employees (with limited votes) and strategic partners (non-voting), according to CNBC.
That makes Anthropic a “controlled company” under exchange rules. “We’re not here to maximize shareholder value,” is how analyst Gil Luria summed up the public-benefit setup to CNBC, adding: “That’s unusual.”
The cost of building frontier AI
The filing also shows how much compute Anthropic has signed up for. According to CNBC, the S-1 lists cloud and chip commitments with Amazon ($110 billion through 2036), Google TPUs ($114.5 billion through 2033), Microsoft (at least $44.9 billion from November 2026 to May 2033) and SpaceX (about $3.1 billion a month, up to $120.5 billion into 2029). CNBC puts the total at at least $542 billion for data centers and cloud. The company reported about $112.4 billion in cash plus $19.3 billion in securities (CNBC).
The risk factors run more than 90 pages, CNBC reports, and include chip supply from Taiwan, data-center moratoriums, misuse of AI models, a dispute with the Pentagon that the company says could cause “material revenue losses,” and an FTC demand for executive testimony.
Why the timing just got harder
The week after the filing was rough for AI stocks. CNBC reported on Oct 31 that the Nasdaq fell 2.9% on Friday, its first three-week losing streak since March, after big-tech earnings raised new questions about AI spending; Google shares had their worst day ever on Thursday, falling almost 13%. CNBC also notes the IPO market has been largely frozen since SpaceX went public in June, and quotes analyst Daniel Newman: “Anthropic is the IPO market at this point.”
Growth is also slowing from its blistering pace. CNBC calculates quarter-over-quarter growth of about 144% in the second quarter and about 47% in the third (CNBC, Oct 30). Investors are still waiting for full third-quarter financials in an updated filing.
How much could it be worth?
Nobody knows yet. The S-1 says the price will be “determined by negotiations among us, the selling stockholders, and the representatives” of the underwriters. Analyst estimates cited by CNBC range from about $1 trillion to $2 trillion. Sinan Aral told CNBC a $1.5 trillion to $2 trillion valuation would be roughly “22 times to 30 times” revenue.
UNVERIFIED / reported: trade publication IFR reports that Anthropic is pushing ahead with a mid-November deal, with a roadshow around Nov 9, and that it could raise up to $100 billion at about a $2 trillion valuation. Those figures come from unnamed sources and are not in Anthropic’s filing.
The road to a first trade
According to Yahoo Finance, SEC rules require the public filing to be out at least 15 days before the roadshow, so the roadshow could start as early as Nov 10. Federal offices close Nov 11 for Veterans Day, which puts the earliest pricing on Nov 13 and the earliest first day of trading on Monday, Nov 16. The U.S. midterm elections on Nov 3 and Thanksgiving on Nov 26 bracket that window. These are earliest-possible dates, not an announced schedule.
A note of caution from the same Yahoo piece: IPO researcher Jay Ritter’s data show that about 60% of more than 9,000 U.S. IPOs from 1975 to 2021 were flat or lower three years after their first closing price.
What to watch next
- An amended S-1 with a share count, a price range and third-quarter numbers.
- The roadshow start date and any change in timing after the midterms.
- Whether AI stocks steady after this week’s sell-off.
- Lock-up details: CNBC reports insiders’ shares unlock in stages rather than all at once.
Our take
The filing confirms what the hype suggested: Anthropic’s revenue is growing at a pace almost no company has matched, and big customers keep spending more. It also shows the price of that growth (enormous compute commitments and huge reported losses) and a structure where public shareholders won’t be in control. Until there’s a price range and fresh numbers, any valuation is a guess. Treat headline figures as starting points, and read the actual prospectus.
Sources: Anthropic announcement (Oct 26, 2026); Anthropic Form S-1 on SEC.gov; CNBC (Oct 26, Oct 30 and Oct 31, 2026); Yahoo Finance (Oct 27, 2026); IFR (reported, unconfirmed). Trending data: Google Trends U.S. “Trending now,” checked Nov 1, 2026. Not investment advice. Images are AI-generated illustrations.
