Anthropic expects retail investors to receive up to 20% of the 825 million shares in its IPO, according to the second amendment to its prospectus, filed with the SEC on 10 November. At the $74 midpoint of the $70 to $78 range, that is about $12.2 billion of stock, by our arithmetic. The first amendment of 2 November named the retail platforms but gave no percentage.
The same filing still leaves the underwriting fee blank. Its new proceeds figures imply a fee of about 1.04% of the offer price, or about $636 million across 22 banks at $74, by our arithmetic. SpaceX’s final prospectus in June stated a fee of $0.90 a share, or about 0.67%.
Business Pill · Distribution Advantage
A one-minute explainer of distribution advantage. It teaches the general idea only and does not discuss Anthropic.
The key insight: Anthropic expects up to 20% of its IPO shares to go to retail investors, its amended prospectus says, about $12.2 billion at the $74 midpoint by our arithmetic. Its $793 million per-dollar proceeds figure implies an underwriting fee of about 1.04%, or about $636 million, against about 0.67% for SpaceX in June, by our arithmetic from the $0.90 a share it stated.
Anthropic expects “allocations to retail investors, both in the United States and in other countries, to represent up to 20% of the shares of Class A common stock offered pursuant to this prospectus, though final amounts will be based on actual demand in the offering”, the prospectus says.
The filing names the platforms: Charles Schwab, Fidelity, Robinhood, Trade-PMR, SoFi and E*TRADE from Morgan Stanley, which will act as “selling group members for this offering”. It notes that E*TRADE from Morgan Stanley is an affiliate of Morgan Stanley & Co., one of the two representatives of the underwriters. A separate European retail offering runs under its own prospectus, which the filing says is expected to be approved by Germany’s Federal Financial Supervisory Authority.
The amendment also adds a new item to the list of things that could move the share price: “potential allocation to retail investors of a minority of shares of our Class A common stock sold in this offering”. That line was not in the 2 November filing.
Anthropic’s implied IPO underwriting fee at the $74 midpoint on 825 million shares, against the fee SpaceX stated in its final prospectus of 12 June 2026. Anthropic’s fee table is blank; its figures are implied by our arithmetic from the $793 million per $1.00 proceeds sensitivity in its Form S-1/A of 10 Nov 2026.
Up to $12.2 Billion for Retail Investors
Twenty percent of 825 million shares is 165 million shares. By our arithmetic, that is about $11.55 billion at $70, $12.21 billion at the $74 midpoint and $12.87 billion at $78. The figure is a ceiling, not a commitment: the filing says the final amount depends on demand.
The filing does not describe a directed share program; the phrase does not appear in either amendment. SpaceX’s final prospectus, by contrast, says its underwriters reserved up to five percent of the shares for “certain employees and persons identified by our executive officers”.
Separately, the cover says certain Anthropic directors and their affiliates have indicated interest in buying up to $303 million of shares in the IPO. The filing says those indications are not binding and that the underwriters earn the same discount on those shares.
The Fee the Filing Leaves Blank
The underwriting table, which should show the discount per share and in total, is still blank. So is the cap on underwriting compensation, which reads “will not exceed % of the gross offering proceeds”. What is new is the Use of Proceeds section.
It puts net proceeds from the IPO and the private placement at approximately $84.6 billion at $74, and says each $1.00 change in the price would change them “by approximately $793 million”. The $26.0 billion placement is a fixed dollar amount that carries no underwriting fee, the filing says, so the $793 million comes only from the 801,351,354 shares Anthropic is selling.
The formula is simple. $793 million divided by 801.35 million shares is about $0.9896 kept for each extra dollar of price. The rest, about 1.04%, is the implied underwriting fee, by our arithmetic. Because the $793 million is rounded, the implied fee could be anywhere from about 0.98% to 1.10%. At $74, 1.04% is about 77 cents a share.
On all 825 million shares at $74, that is about $636 million in fees, by our arithmetic, within a range of $598 million to $674 million. About $618 million would come out of Anthropic’s proceeds and about $18 million from the selling stockholders. The option on 123,750,000 extra shares is priced “less underwriting discounts and commissions”, the filing says, so full exercise would add about $95 million more.
A second route gives a similar answer. Taking the $84.6 billion net, removing the $26.0 billion placement and adding back the filing’s $68 million estimate of offering expenses leaves about $58.67 billion from the IPO shares. Against $59.30 billion of gross proceeds, that implies about $632 million of fees, or about 1.07%, by our arithmetic.
How It Compares With SpaceX
SpaceX’s final prospectus, filed with the SEC on 12 June, set its IPO at $135.00 a share with underwriting discounts and commissions of $0.90 a share, or $500,000,000 in total. That is 0.67% of the offer price, by our arithmetic.
Anthropic’s implied 1.04% is about 1.56 times SpaceX’s rate. In dollars, the implied $636 million is about $136 million more than SpaceX paid, on a smaller offering: about $61.05 billion of stock at $74, against about $75.0 billion for SpaceX. SpaceX’s prospectus also says its underwriters “will not receive any discount or commission on any shares of our Class A common stock sold pursuant to the over-allotment option”; Anthropic’s option shares carry the discount.
The 22 Banks
The cover lists 22 underwriters, led by Goldman Sachs and Morgan Stanley as representatives: J.P. Morgan, Citigroup, Barclays, Wells Fargo Securities, BofA Securities, Deutsche Bank Securities, RBC Capital Markets, UBS, BMO Capital Markets, BNP Paribas, Credit Agricole CIB, Jefferies, Mizuho, MUFG, TD Securities, BTIG, Cantor, Capital One Securities, Macquarie Capital and Societe Generale. The column showing how many shares each bank takes is still blank.
As our earlier piece on the trading date reported, citing Bloomberg, JPMorgan is leading domestic retail marketing and share allocations. The filing itself does not say how the fee will be split among the banks.
As we read the filing, the retail ceiling and the fee point to how widely the shares are being distributed: six named brokerage platforms, a separate European retail offering and 22 underwriters, with no directed share program described.
As we read the arithmetic, the implied fee is an estimate with a range of about 0.98% to 1.10%, because the $793 million is rounded; a second route through the $84.6 billion net figure gives about 1.07%, inside that range.
Anthropic, Form S-1/A, 10 November 2026
“though final amounts will be based on actual demand in the offering”
Three Implications
FOR RETAIL BUYERS The filing gives a ceiling of up to 20% of the shares, not a commitment; at $70 to $78 that is about $11.55 billion to $12.87 billion, by our arithmetic.
FOR ANTHROPIC About $618 million of the implied fee would come out of its proceeds at $74, by our arithmetic; the option shares carry the discount too, the filing says.
FOR THE BANKS The filing does not say how the fee is split among the 22 underwriters; the share column per bank is still blank.
The framework argues: “It is a sovereign-scale financing problem dressed in tech-company clothing — and the financial architecture is starting to invert.”
As we read it, Anthropic’s second amendment shows that architecture reaching individual investors: up to 20% of the IPO shares for retail buyers through six platforms, beside a $26 billion placement with suppliers that pays the banks nothing. The framework predates this filing and does not discuss Anthropic’s IPO.
What Is Not Established
The filing does not state the underwriting discount, per share or in total, or how it is split among the 22 banks; the 1.04% is implied by our arithmetic, not disclosed. It does not give the final retail allocation, how the retail shares split between platforms or between the US and other countries, or a pricing date. The fee could also change when the final prospectus is filed.
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Anthropic’s second amendment sets a ceiling of 20% of its IPO shares for retail investors, about $12.2 billion at $74, by our arithmetic. Its proceeds figures imply a fee of about 1.04% for its 22 banks, or about $636 million, against about 0.67% for SpaceX in June, based on the $0.90 a share it stated.
A note on sourcing. The retail allocation, retail platforms, underwriters, proceeds sensitivity, net proceeds and expense estimate are from Anthropic’s Form S-1/A filed with the SEC on 10 November 2026 (Amendment No. 2), compared with Amendment No. 1 of 2 November. SpaceX’s fee is from its Form 424B4 of 12 June 2026. The underwriting fee for Anthropic is not disclosed; the 1.04% and every dollar figure derived from it are implied by our arithmetic. Anthropic was not contacted for this piece.
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.
