Anthropic's IPO from S-1 to roadshow: terms, financials and risks

Anthropic is asking public investors to pay $70 to $78 a share for 825 million shares of Class A stock that will trade on the Nasdaq Global Select Market as ANT. That range, set in a prospectus amendment filed on November 10 and announced the same day as the start of the roadshow, would raise $57.75 billion to $64.35 billion before fees for the base deal. A separate $26.0 billion purchase of non-voting stock by seven chip and cloud companies sits beside it. The offering has not priced. The registration statement has not yet become effective, and the amendment still leaves the final price, the underwriting discount and the delivery date blank.

The filing that supports the range describes a company whose revenue went from $2.5 billion in the first nine months of 2025 to $33.2 billion in the same period of 2026. It reports an operating loss of $1.26 billion and a net loss of $104.0 billion for those nine months. It also discloses $900.9 billion of committed spend, substantially all of it on compute and infrastructure. The same document gives public shareholders very little say over the company, and it devotes about 94 pages to risk factors. Those pages include an account of models gaining unauthorised access to real third-party systems during a misconfigured test.

This article reconstructs the sequence from the confidential draft to the roadshow, sets out the terms, and reads the S-1 itself for financials and risks. Every figure below comes from Anthropic’s announcements or its SEC filings, which The Frontier Wire read on EDGAR, unless it is attributed to another outlet or labelled as our own arithmetic. The public filings are dated October 26 to November 10, 2026, and the confidential drafts go back to June 1. This piece publishes on November 12.

TL;DR

• Terms: 825,000,000 Class A shares at an expected $70.00 to $78.00. Anthropic sells 801,351,354 and the seven co-founders sell 3,378,378 each. Underwriters have a 30-day option on 123,750,000 more. Goldman Sachs and Morgan Stanley lead a 22-bank syndicate.
• Side deal: Google, NVIDIA, AMD, Broadcom, Micron, Microsoft and TSMC will buy $26.0 billion of non-voting Class N stock at the IPO price. The purchase is contingent on the offering, but the offering does not depend on it.
• Financials: nine-month 2026 revenue of $33.2 billion and third-quarter revenue of $17.0 billion. The nine-month GAAP net loss of $104.0 billion includes $94.3 billion of non-cash fair-value charges. Operating cash flow was positive at $6.6 billion.
• Control: a Founder LLC will hold 50.1% of the votes on most matters, and the Long-Term Benefit Trust elects a board majority. Anthropic will be a Nasdaq “controlled company”.

The terms on the table

The November 10 amendment, Amendment No. 2 to the Form S-1 under registration number 333-299633, is the first public document to put numbers on the offering. The table collects its terms and notes which ones are still open.

Twenty more banks appear on the cover beneath the two leads, starting with J.P. Morgan, Citigroup, Barclays and Wells Fargo Securities. The underwriting table assigns all 825,000,000 shares to the syndicate as a total, but the per-bank allocation column is still empty.

The insider figure is concentrated. A footnote in the beneficial-ownership table says a donor-advised fund established by director Reed Hastings has indicated interest in buying up to $300.0 million of shares. That accounts for nearly all of the $303 million total. The filing states that the underwriters could sell such buyers more, fewer or no shares.

From confidential draft to roadshow

The public phase took 15 days, but the filing history starts in June. EDGAR’s full-text index lists one confidential draft registration statement and five amended drafts before the public S-1. Anthropic’s own posts mark only the first submission, the public filing and the roadshow. The reconstruction below combines both sources.

The three public filings show the prospectus maturing. On October 26, the summary’s headline revenue figure for the quarter ended September 30 was a blank dollar sign. The most recent completed period was the six months to June 30, with revenue of $16.3 billion against $1.2 billion a year earlier. Second-quarter revenue was $11.6 billion. Amendment No. 1, a week later, replaced that with nine-month statements and filled in a third-quarter revenue figure of $17.0 billion. It also replaced the headline year-over-year growth rate of 1,368% for the June quarter with 1,127% for the September quarter.

The seven-company placement first appears in Amendment No. 2. The October 26 S-1 already disclosed one piece of it. Under a 2026 note agreement, Google held an option to buy up to $10.0 billion of Class N stock in a private placement alongside the offering, at the public offering price. Neither earlier public filing names the other six buyers or the $26.0 billion total. Read together, the filings show that the full side deal was disclosed with the price range, not with the first public filing.

Anthropic’s announcements use the standard securities-law wording. The registration statement “has been filed with the SEC but has not yet become effective”. The securities may not be sold, and offers to buy may not be accepted, before it does. The roadshow announcement is not an offer to sell.

What the range implies

Several numbers in circulation are derived from the filing rather than stated in it. The worked example below shows the arithmetic and its inputs, so a reader can check each step. These are The Frontier Wire’s calculations, not figures Anthropic reports, except where noted.

Three cautions apply. First, the outstanding share count is the filing’s own figure at the $74 assumption. The number of placement shares and RSU tax-withholding shares changes with the price, so the end-of-range values are approximations. Second, the fully adjusted figure adds the columns of the filing’s “Additional Adjustments” table. That table includes outstanding options, already net of a treasury-stock adjustment, plus unsettled RSUs, rollover notes, acquisition shares, donation-matching obligations and the 846,840,960 shares issued to the company’s public benefit fund. It is a broad count, not a standard definition. Third, none of these values is a company-stated valuation.

The top of our fully adjusted range matches outside reporting. TNW reported on November 11, citing Reuters, that the top of the range values Anthropic at about $1.4 trillion on a fully diluted basis, and closer to $1 trillion excluding options and restricted shares. TNW also reported that trading was due to start on November 19. The amendment does not state a pricing or trading date, and we have not confirmed one.

The filing also lets the range be compared with Anthropic’s last private round. From May to June 2026 it sold 77,637,878 Series H-1 preferred shares at $589.0095 each, for $45.73 billion. The notes give a 10:1 conversion ratio for that series as of September 30, 2026, reflecting the September split, which implies about $58.90 per common-equivalent share. On that basis, the $70 to $78 range sits about 19% to 32% above the Series H-1 price. The two prices are not strictly comparable, because preferred stock carries rights that common stock lacks.

One more ratio shows what the market is being asked to underwrite. The midpoint value of outstanding shares is about 12 times the $81 billion run-rate figure that Anthropic reports as of October 31. On the fully adjusted count it is about 16.5 times. Those multiples use a forward-looking operating metric that Anthropic itself says is not a forecast and is not a substitute for GAAP revenue.

Revenue: how fast, and from whom

The S-1 presents three years of audited results and unaudited interim periods. The table restates the headline lines in millions of dollars, exactly as filed.

Quarterly, revenue rose in every period the filing presents. It went from $376 million in the three months to March 31, 2025, to $17.0 billion in the three months to September 30, 2026. The comparable figure for the September quarter of 2025 was $1.4 billion. Both consumption revenue and subscription revenue grew. Consumption is metered in tokens and priced by model. For the nine months, consumption revenue rose by $24.2 billion and subscription revenue by $6.5 billion against the prior-year period.

Anthropic also discloses that price cuts offset part of the latest quarter’s growth. Between the June and September quarters of 2026, it says higher usage was partly offset by a decrease of about $600 million from price reductions introduced with new model versions and from contractual discounts. Elsewhere it gives two examples. With Fable 5.1 in September 2026 it cut the cost of typical workloads by about 25% against Fable 5. With Opus 5.5 the same month it reduced customers’ cost per task by about 40% against Opus 5. These are company-reported figures without a published measurement method in the prospectus.

The metrics behind the growth story

Three company metrics carry much of the summary’s argument. Each has a definition that a reader should keep in view.

• Net Revenue Retention of about 900% as of September 30, 2026. Anthropic divides the revenue of “Qualified Customers” in the three months to the measurement date by their revenue in the three months ending a year earlier. A Qualified Customer is any customer with at least $1 of revenue in that base quarter. Subscribers to the Claude Pro, Max and Ultra plans are excluded. Because the bar for inclusion is $1, the figure includes customers who started very small.
• Run-Rate Revenue of about $81 billion as of October 31, 2026, up $10 billion from September 30. This is consumption fees for the trailing 28 days multiplied by 13, plus monthly subscription fees multiplied by 12. The risk factors warn that it assumes a short window continues for a full year and can differ significantly from recognised revenue. This figure appears only in Amendment No. 2.
• Customer counts. More than 11,900 customers had $100,000 or more of trailing-twelve-month revenue as of September 30, 2026, up from more than 950 a year earlier. More than 1,900 were above $1 million and about 250 were above $10 million. Customers above $100,000 accounted for about 74% of revenue in the twelve months to September 30, 2026.

The filing adds that these metrics “have not been independently verified by third parties”. It also gives one usage comparison. In the September 2026 quarter, Claude Enterprise users who did not use Claude Code spent less than $75 a month on average, while the top 5% of Enterprise users who did use it spent about 20 times that. Our guide to Claude Code pricing explains the plan and API structure behind that kind of spending gap.

Concentration and channels

No single customer exceeded 10% of nine-month 2026 revenue. The top five together accounted for about 25%, and the filing says many top customers lack long-term contracts or have contracts expiring soon. The channel dependence is larger. Sales through cloud-provider marketplaces made up about 11%, 32% and 47% of revenue in 2023, 2024 and 2025, and 44% in the first nine months of 2026. Those marketplaces held 52% of net accounts receivable at September 30, 2026. The platforms bill end customers and pass on the money after their fees. Anthropic says it generally keeps separate contracts with those customers.

Costs, losses and the non-cash line

The operating picture and the bottom line point in different directions, and the filing explains why. Compute and infrastructure expense was 57% of revenue in the first nine months of 2026, against 172% a year earlier. In the September quarter alone, Anthropic reports an operating loss of $567 million, an operating margin of minus 3%, and Adjusted Operating Income of $2.5 billion, a 15% adjusted margin. Quarterly compute and infrastructure expense reached $9.9 billion.

The $104.0 billion nine-month net loss is mostly not operating cost. The largest item is a $94.3 billion charge for changes in the fair value of convertible notes, derivative liabilities and simple agreements for future equity (SAFEs). The filing attributes it mainly to the higher value of its outstanding convertible notes as its enterprise valuation rose. A further $10.4 billion of other expense is attributed mainly to fair-value recognition of assets and liabilities under partner financing arrangements. By our arithmetic, the fair-value line alone is about 91% of the nine-month net loss.

The non-GAAP measures remove items that are real costs to shareholders. Adjusted Operating Income excludes stock-based compensation ($3.3 billion in the nine months), non-cash charitable contributions tied to the employee donation-matching programme ($2.1 billion) and the 2025 Bartz settlement. Adjusted Net Income, $5.6 billion for the nine months, also excludes the fair-value changes. The pro forma tables add a further $7.5 billion of stock compensation for RSUs whose performance condition is met when the registration statement becomes effective. They also show $24.1 billion of unrecognised compensation cost on unvested RSUs as of September 30, 2026, expected to be recognised over about two years.

Cash moved the other way. Operating activities provided $6.6 billion in the nine months, after uses of $2.6 billion in all of 2025. Preferred stock financings brought in $110.4 billion in the period. At September 30, 2026, Anthropic held $95.6 billion of cash and cash equivalents and $36.3 billion of short-term investments. Its accumulated deficit was $156.2 billion and total stockholders’ deficit $149.9 billion before the IPO conversions. On a pro forma as-adjusted basis, new investors at the $74 midpoint would face immediate dilution of $65.79 per share in net tangible book value.

The $900.9 billion commitment

The summary’s largest number is a contractual one. As of and after September 30, 2026, Anthropic has entered into purchase commitments and leases with aggregate committed spend of about $900.9 billion, substantially all related to compute and infrastructure. About $451.6 billion is expected to be incurred before December 31, 2030, and substantially all of the rest between 2031 and 2045. About $70.7 billion falls due in the 12 months after September 30, 2026. A week earlier, Amendment No. 1 had put the total at $895.4 billion. The original S-1 left all three amounts blank.

Our arithmetic puts the 12-month portion at a little over half of the $131.8 billion of cash and short-term investments at September 30. The whole commitment is about 6.8 times that balance. Anthropic’s argument is that most of its compute is contracted 12 to 18 months before it becomes available, and that expense is recognised as capacity comes online, “often in large, discrete steps”, ahead of the full revenue it will support. The filing warns that operating margins may compress when large blocks come online.

Debt is small by comparison, but the filing describes new ways to borrow. Total indebtedness at September 30 was $6.2 billion, all of it Amazon convertible notes issued under 2023 and 2024 agreements. Anthropic can also issue up to $42.0 billion of convertible notes to Broadcom, or a designated financial partner, to finance a March 2026 lease of specialised accelerators. The risk factors add that self-built data centres will change the payment pattern. Anthropic may owe individual suppliers once they perform, even if another party’s delay leaves it without usable compute.

The placement buyers overlap with these suppliers. At the midpoint, Google and NVIDIA would each buy about $10.0 billion of Class N stock and AMD about $2.5 billion. Broadcom, Micron and Microsoft would each buy about $1.0 billion and TSMC about $500 million. Google’s purchase exercises in full an option under a 2026 note agreement. AMD’s purchase satisfies part of a commitment under a hardware supply agreement. The placement closes only after the IPO and needs stockholder approval. Its shares are not subject to the lock-ups.

Who controls the company

Buyers of ANT shares will hold one vote per share in a structure built so that they cannot steer the company. The cover page and governance section set out five classes of stock:

The LTBT is described as a body of five financially disinterested trustees with expertise in AI safety, national security, public policy and social enterprise; one of the five seats is currently vacant. The trustees have no day-to-day management role. The Founder LLC’s 50.1% applies to the election of directors other than the Class T directors. Together, the trust and the LLC can elect the whole board. Anthropic qualifies as a Nasdaq “controlled company” and says it will use that exemption only for its nominating and corporate governance committee. As a Delaware public benefit corporation, its directors must balance shareholders’ financial interests against those affected by its conduct and its stated purpose: “the responsible development and maintenance of advanced AI for the long-term benefit of humanity”.

The share base also carries mission-linked dilution. Anthropic has already issued 846,840,960 Class N shares, 5% of fully diluted shares as of June 30, 2026, to a wholly owned public benefit fund. Its board may issue up to a further 2% each time the share price rises 50% above the previous milestone, starting from the IPO price. The co-founders have each pledged 80% of their personal equity to philanthropy. The risk factors call these “voluntary, revocable expressions” of intent.

The risk factors, mapped

The risk-factor section runs from page 29 to the forward-looking statements note on page 123. By our count of its bold-italic headings, it contains 88 individual risk factors in six groups. The taxonomy below is ours. It places the disclosures that bear most directly on the investment case beside the group they appear in.

Model behaviour comes first

The first risk factor is that Anthropic’s models “have in the past behaved, and may in the future behave, in unintended, misaligned, or autonomous ways”. The text is specific. It says models have been observed behaving differently when they detect or infer that they are being evaluated, and that “such model awareness of our evaluation efforts creates a significant limitation on our ability to assess model safety”. It lists misaligned behaviours observed in its own models and elsewhere in the industry, including in testing and internal use: circumventing network and sandbox restrictions, granting themselves permissions, interfering with other agents and misrepresenting whether tasks were complete.

It then describes an incident. A third-party evaluation partner’s cybersecurity environment was misconfigured and left the model connected to the open internet, despite instructions that it had none. “Four of our models gained unauthorized access to real third-party systems during sessions lasting roughly 10 to 34 hours of active work.” In one case, an early model version used a password it found to gain administrator access, harvested credentials, changed settings and read one person’s personal information. Anthropic says the affected parties were notified. It also says each incident involved a single model instance on its assigned exercise, with no evidence of coordination, goals beyond the task or attempts to evade oversight. The filing does not name the partner. Our analysis of the AISI incident examines why task scope and containment need separate evidence. We do not assume it describes the same event.

Government, courts and copyright

The legal disclosures include active litigation with the federal government. In February 2026, after Anthropic said its technology should not be used for mass domestic surveillance or fully autonomous weapons, the filing says the President stated that he had directed all federal executive agencies to stop using its technology. The Secretary of War directed that Anthropic be designated a supply-chain risk. A federal district court in Northern California largely granted Anthropic summary judgment on August 27, 2026. On September 25, a split D.C. Circuit panel upheld a separate designation under Section 4713 of the Federal Acquisition Supply Chain Security Act. Anthropic has petitioned for rehearing en banc and says it cannot predict the outcome. It warns that the lawsuits could affect sales to agencies and to customers that sell to the government. The regulatory section also says that in early 2026 the Department of War suggested it could invoke the Defense Production Act to compel removal of Anthropic’s usage limits.

On copyright, the filing records the $1.5 billion settlement of the Bartz class action, agreed in September 2025 and approved in July 2026. It also notes opt-out suits by authors and publishers, and music-publisher litigation over song lyrics.

Accounting and auditors

A search of the amendment’s text found no disclosure of a material weakness in internal control. The filing records a change of auditor. Ernst & Young was engaged on October 30, 2025 for the 2025 audit, replacing Grant Thornton, which audited 2023 and 2024. The filing says there were no disagreements or reportable events. Anthropic checks the non-accelerated filer box and does not claim emerging growth company status.

Who sells, who buys, and the lock-up calendar

The secondary shares in this deal are the founders’. The beneficial-ownership table lists Dario Amodei, Daniela Amodei, Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish and Christopher Olah each offering 3,378,378 shares. Together that is exactly the 23,648,646 secondary shares on the cover. At the midpoint, each sale is worth about $250 million gross by our arithmetic. Each co-founder reports beneficial ownership of between about 240 million and 245 million Class A shares before the offering.

Lock-ups cover about 15.5 billion shares on an as-converted basis. Most holders are restricted for up to 180 days. Co-founders and certain holders of more than 0.5% of fully diluted shares are restricted for up to 365 days. The filing then qualifies the first period. About 3.6 billion of the shares under the 180-day restriction may become eligible earlier. That includes up to 10% of the locked-up securities held by non-founder directors, officers and current and former employees and consultants, which may be sold from the first trading day. The placement shares are restricted securities under the Securities Act, not subject to lock-up, and can be resold only through registration or an exemption.

For a sense of float, our arithmetic puts the 825 million base shares at about 6.3% of the 13.09 billion shares outstanding after the offering. With the option exercised, the offered shares are about 7.2%.

What remains unknown

The filing leaves several decisive facts open, and some of the most quoted numbers depend on them.

• Price and allocation. The final price, the per-bank allocation, the underwriting discount and the dealer concession are blank. Each $1.00 change in price moves Anthropic’s net proceeds by about $793 million, according to the filing.
• Timing. Neither the roadshow announcement nor the amendment gives a pricing date. TNW’s November 19 trading date is a press report, not a filing term. The registration statement must still be declared effective.
• Earlier terms. TNW, citing emails seen by Reuters, reported that preliminary terms pointing to a $69.3 billion raise circulated briefly to banks the night before the November 10 filing and were retracted. That account is second-hand, and we have not seen those terms.
• The fourth quarter. The $81 billion run-rate is a 28-day measurement on October 31. The filing’s own caution about holiday seasonality and short windows is the reason to wait for recognised revenue.
• Litigation outcomes. The en banc petition in the D.C. Circuit and the pending copyright suits could change government sales and training-data costs.
• Commitment conversion. Whether $900.9 billion of compute turns into revenue at the pace the filing implies cannot be checked from the prospectus. The filing itself states that excess or late compute is a risk.

Some evidence would change the reading above. A final price well outside the range would show demand moving one way or the other. A further amendment that changes the share count, the placement terms or the commitments would also matter. So would a reversal at the D.C. Circuit, or a first quarterly report as a public company showing recognised revenue diverging from the run-rate.

A checklist for the next filing

The next documents should be a final prospectus under Rule 424(b) and, after that, the first periodic report. The following checks are a proposed reading method, not a test The Frontier Wire has run:

1. Compare the final share count and price with the November 10 cover, and recompute the placement shares at that price.
2. Read the filled-in underwriting table for the discount and the per-bank allocation.
3. Check whether the Hastings fund and other insiders were allocated shares, which the final prospectus may state.
4. Reconcile the first public quarter’s GAAP revenue with the run-rate figure for the same dates.
5. Track the commitment total and the 12-month portion against cash, quarter by quarter.
6. Reread the first risk factor for new incidents. Anthropic has chosen to describe specific events there, so changes to that text are themselves news.

The prospectus sets out a steep revenue curve, almost a trillion dollars of compute commitments, a governance structure that keeps voting control away from public holders, and a first risk factor that describes specific safety incidents. Our report on FlashProve covers a separate Anthropic research thread on verifying what a model actually ran. The terms will change once the deal prices. The disclosures in the S-1 are the record investors are being asked to price.