Anthropic filed its S-1 registration statement on 26 October and an amended S-1/A on 2 November, as we reported, but it has not set a price range in a public filing. Reuters reported that the roadshow “was initially expected to kick off the week of November 9”, with pricing the following week, and that investors are “raising doubts about whether the artificial intelligence startup can proceed with its planned roadshow next week in time for a November listing”.
This explainer sets out the five steps between a filed S-1 and shares that insiders can sell, using the SEC’s own investor guidance and what Anthropic’s filings already say. At the sizes reported so far, an offering of $80 billion to $100 billion at a valuation of $1 trillion to $1.5 trillion would sell 5.3% to 10.0% of the headline valuation, by our arithmetic.
Business Pill · Run-Rate Revenue
A one-minute explainer of run-rate revenue, a measure often used to describe fast-growing AI companies ahead of listings. It teaches the general idea only and does not discuss Anthropic’s IPO.
The key insight: As we read the filings and the guidance, five steps separate Anthropic’s S-1 from shares insiders can sell: a price range, a roadshow and order book, effectiveness and pricing, a final prospectus and first trade, and a 180-day lockup. The S-1/A already sets the lockup length and the share-class conversion; the price range, the raise and the dates are still open, and at reported sizes 5.3% to 10.0% of the headline valuation would be sold, by our arithmetic.
To register an offering, a company files a registration statement with the SEC, typically using Form S-1, according to the SEC’s investor bulletin on IPOs. The SEC’s staff reviews it, and the bulletin says the review “often results in revisions to the prospectus”. Anthropic’s list of SEC filings showed the S-1 of 26 October and the S-1/A of 2 November, and no Form RW, the form used to withdraw a registration, when we checked on 5 November.
From S-1 to the week Reuters said the roadshow was first expected is 14 days, by our arithmetic: 26 October to 9 November.
Lockup. Directors, officers and holders of substantially all of the company’s capital stock agreed that, “for a period of 180 days after the date of this prospectus”, they will not sell or otherwise dispose of its securities without consent, the filing says, as we reported.
Share classes. The filing says the Series A, C-1, D-1, D-2, E-1, F-1, G-1 and H-1 preferred convert into Class A common stock, and other series into Class N common stock, “immediately prior to the completion of this offering”. Its balance sheet puts the preferred stock’s aggregate liquidation preference at $136,286 million and convertible notes payable at $130,502 million, both as of 30 September 2026, as we reported.
Convertible notes. Under Amazon’s note agreements, outstanding principal and accrued interest convert into Class N common stock at the lower of $2.0928 or $5.0478 per share, depending on the agreement, and the IPO price, as we reported.
Equity pay. The S-1/A reports approximately $32.3 billion of unrecognized stock-based compensation expense related to RSUs as of 30 September 2026, as we reported.
The blank line. According to Reuters, investors are waiting for the company’s October revenue figure, “which the company left blank in its updated S-1 filing”. Separately, The Wall Street Journal reported, citing a person familiar with the matter, that Anthropic’s run rate topped $80 billion at the end of October, as we reported. That is a reported figure, not a filed one.
Step 1: The Price Range
Anthropic has not set a price range in a public filing, so the IPO valuation is not established, as we noted. The SEC bulletin says the final prospectus “generally includes information related to the final offering price that is not available at the time the preliminary prospectus is distributed”. What it would reveal: the first range Anthropic itself puts on the shares, and so the valuation it is asking for.
Step 2: The Roadshow and the Order Book
The underwriters typically obtain “indications of interest” from prospective investors before the registration is declared effective, according to the SEC bulletin. It defines the order book as “the compilation of indications of interest that the underwriters have obtained from the client-investors they solicited regarding the IPO”.
For Anthropic, Reuters reported that investors “are pushing for a more attractive valuation to commit to the offering”. What this step would reveal: how much demand there is at the range, which public filings do not show until the final terms.
Step 3: Effectiveness and Pricing
Once staff comments are addressed, the SEC staff issues an “order declaring the registration statement effective”, the bulletin says, and that “does not represent an approval of the merits of the IPO”. The underwriters use the indications of interest to “recommend a price for the shares to the issuer, who ultimately determines the price of the IPO”.
Kalshi’s Anthropic contracts resolve Yes when the SEC declares the S-1 effective, the IPO is priced or an exchange assigns a ticker, as we reported. What this step would reveal: the price, the number of shares sold and the amount raised.
Step 4: The Final Prospectus and the First Trade
After the registration is declared effective, the company will typically file a final prospectus, “usually identified as a 424B3 or 424B4 filing in the EDGAR database”, according to the SEC bulletin. What this step would reveal: the final share count and the date of the prospectus, from which the lockup runs.
Step 5: The 180-Day Lockup
The SEC bulletin says existing shareholders often enter a “lock-up agreement” in which they agree not to sell their shares for a certain period of time, “typically 180 days”. The SEC’s glossary says most lockups “prevent insiders from selling their shares for 180 days”. Anthropic’s S-1/A uses that length, counted from the date of the prospectus. That date is not yet set, so neither is the lockup’s end.
The Numbers in Play
The Journal reported that Anthropic “has been expected to raise up to $100 billion in an offering that could value the company at around $1.5 trillion”. Techmeme’s summary of the report says one investor said it “could be closer to $1T”, as we reported. One investor told the Journal the company could raise less, perhaps around $80 billion, as we reported. The Journal also noted that Anthropic had $146.6 billion of cash on 30 September.
Share of the headline valuation sold, by our arithmetic and only if those figures were the final terms: $80 billion at $1 trillion is 8.0%, $80 billion at $1.5 trillion is 5.3%, $100 billion at $1 trillion is 10.0%, and $100 billion at $1.5 trillion is 6.7%. The grid ignores dilution from the offering, note conversion and RSUs.
Traders’ prices: Polymarket’s price for an Anthropic IPO before the end of 2026 fell from 90.1% to 77.1% on 5 November, as we reported. On Kalshi, the “before 1 January 2027” contract was bid at 74 cents and offered at 75 cents at 17:59 UTC on 5 November, as we reported. These are traders’ prices, not forecasts.
As we read the S-1/A, the terms already fixed are the ones that bind insiders and existing holders: the 180-day lockup, the conversion of preferred into Class A and Class N, and the notes that convert at the IPO.
As we read the reports, the figures in public debate, from $1 trillion to $1.5 trillion and from $80 billion to $100 billion, are reported by the Journal and Reuters, not filed; the first figure Anthropic itself puts on the shares would be its price range.
As we read the SEC guidance, each step makes something public that is not public now: the range, the demand, the price, the share count and the date from which the lockup runs.
Reuters, 5 November 2026
“the company could decide to delay the offering”
Three Implications
FOR PROSPECTIVE INVESTORS The S-1/A sets a 180-day lockup counted from the date of the prospectus, which is not yet set.
FOR READING THE NEXT FILING A price range in a public filing would be the first valuation Anthropic itself puts on the shares; the SEC bulletin says the final offering price appears in the final prospectus.
FOR THE TIMETABLE Reuters reported the roadshow was initially expected the week of 9 November, with pricing the following week, and that the company could decide to delay.
The analysis says: “Conflating these clocks produces the most common analytical errors of the moment.”
As we read it, an IPO timetable runs on the shortest clock, weeks between a range and a first trade, while the lockup and the business it prices run on longer ones. The framework predates the filing and does not discuss it.
What Is Not Established
Anthropic has not set a price range in a public filing, and the S-1/A leaves the offering price blank. It declined to comment on investor doubts, Reuters said. The roadshow and pricing timetable comes from Reuters’ sources and may change; Reuters itself reported that the company “could decide to delay the offering”. The $80 billion run rate and the $80 billion raise come from the Journal’s sources, not from a filing. The 5.3% to 10.0% grid is our arithmetic on reported figures, not terms.
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Five steps separate Anthropic’s filed S-1 from tradable insider shares: a price range, a roadshow and order book, effectiveness and pricing, a final prospectus and first trade, and a 180-day lockup. The S-1/A already sets the lockup length, the share-class conversion and the size of the notes; the price range, the raise and the date are still open.
A note on sourcing. The IPO steps come from the SEC’s investor.gov pages; the Anthropic facts come from our reporting of 4 to 6 November 2026 on its S-1, S-1/A and press reports, linked throughout, and keep the attribution of the original report. The five-step grouping is our framing. Percentages and day counts marked as ours are our arithmetic on reported, not filed, figures.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
