Anthropic expects to pay $67,684,106 in expenses for its initial public offering, not counting the underwriting discount, according to the cost table in its S-1/A of 10 November. Legal fees and expenses are the largest line, at $41,479,483.
That is 61% of the total, by our arithmetic. Accounting fees and expenses add $18,380,963, so lawyers and accountants together take 88%. In the 2 November version of the filing every line in the table was blank and marked “To be filed by amendment”.
Business Pill · IPO Float
A short explainer on IPO float, the share of a company sold in its listing. It teaches the general idea and does not discuss the cost table.
The key insight: Anthropic’s 10 November S-1/A puts its expected IPO costs at $67,684,106 excluding the underwriting discount, and $41,479,483 of that is legal fees: 61% of the total, by our arithmetic. The cost table was blank in the 2 November filing.
The table sits in Part II of the registration statement, under “Other Expenses of Issuance and Distribution”. The filing says it covers “all expenses to be paid by us, other than underwriting discounts and commissions, upon completion of this offering”, and that “All amounts shown are estimates except for the SEC registration fee, the FINRA filing fee, and the exchange listing fee”.
The three fixed fees are an SEC registration fee of $6,438,218, a FINRA filing fee of $225,500 and an exchange listing fee of $325,000. The estimates are $438,462 for printing and engraving, $41,479,483 for legal fees, $18,380,963 for accounting fees, $7,000 for the transfer agent and registrar, and $389,480 of miscellaneous expenses.
The underwriting section gives the rounded version: “We estimate that our share of the total expenses of the offering, excluding underwriting discounts and commissions, will be approximately $68 million”. Anthropic also says it will reimburse the underwriters for certain FINRA-related expenses “in an amount up to $275,000”, and that “The underwriters have also agreed to reimburse us for certain expenses in connection with the offering”. The filing does not give that amount.
Anthropic expected offering expenses excluding the underwriting discount, from Part II Item 13 of its S-1/A of 10 November 2026. Percentage shares are our arithmetic.
What Was Posted on X
ANTHROPIC EXPECTS TO SPEND $41.5M ON LEGAL FEES FOR ITS IPO
That’s roughly 61% of its $67.7M in estimated offering expenses, excluding underwriting commissions.
Other costs include $18.4M for accountants and $6.4M in SEC registration fees, according to its filing.
Wall St Engine posted the headline figure from the filing: Anthropic expects to spend $41.5M on legal fees for its IPO, which the post puts at roughly 61% of $67.7M in estimated offering expenses excluding underwriting commissions, and it also lists $18.4M for accountants and $6.4M in SEC registration fees.
Our Numbers
The SEC fee is about 9.5% of the total, by our arithmetic. The other five lines, printing, FINRA, listing, transfer agent and miscellaneous, come to $1,385,442, or about 2%.
Anthropic is selling 801,351,354 of the 825,000,000 shares in the offering; selling stockholders sell the rest. At $70 a share its gross proceeds from those shares would be about $56.09 billion, and at $78 about $62.51 billion. The $67.7 million is about 0.12% of the first and 0.11% of the second, or about 8.4 cents for each share Anthropic sells, by our arithmetic.
The underwriting discount is larger. The filing still leaves it blank; our read of the retail allocation found that the proceeds figures imply a fee of about 1.04% of the offer price, or about $636 million at $74, by our arithmetic. On that estimate the banks’ fee would be about 9.4 times the $67.7 million of other costs.
The Structural Read
As we read the table, the cost of going public is mostly professional work: lawyers and accountants take 88% of the $67.7 million, by our arithmetic, while the regulator and exchange fees are under 11%.
As we read the proportions, the bigger cost is the one still missing: the underwriting fee our earlier analysis estimated at about $636 million at $74 would be about 9.4 times this table, by our arithmetic.
Anthropic, PBC, Form S-1/A, 10 November 2026
“We estimate that our share of the total expenses of the offering, excluding underwriting discounts and commissions, will be approximately $68 million”
Three Implications
FOR THE PROCEEDS The $67.7 million is about 0.12% of the $56.09 billion Anthropic would raise from its 801,351,354 shares at $70, by our arithmetic.
FOR THE FEE The underwriting discount is still blank in the filing; our earlier estimate from its proceeds figures is about 1.04% of the offer price.
FOR THE FINAL PROSPECTUS The filing says every line except the SEC, FINRA and listing fees is an estimate.
The framework records: “The Financial Times then compiled the totals: $725 billion combined for the Big Four in 2026, up 77% from $410B in 2025.”
As we read it, an IPO of this size is one of the ways a model lab funds its share of that buildout; the $67.7 million is the cost of the public listing itself, not of the compute it pays for. The framework does not discuss the filing.
What Is Not Established
Apart from the three fixed fees, every line is an estimate and could change in the final prospectus. The filing does not name the law or accounting firms in the cost table, split the $41.5 million between them, or say how much the underwriters will reimburse. The underwriting discount is our estimate from rounded filing figures, not a number Anthropic has stated. Business Insider also reported the $41.5 million legal figure. Earlier coverage: the $70 to $78 price range, the filing in 13 numbers and our Anthropic IPO map.
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Anthropic’s 10 November S-1/A fills in the cost table that was blank a week earlier: $67,684,106 in expected offering expenses, of which $41,479,483 is legal fees. Against $56 billion to $63 billion of gross proceeds from the shares it sells, those costs are about 0.1%, and smaller than the underwriting fee the filing has yet to state.
A note on sourcing. Figures and quotations are from Anthropic’s S-1/A filed with the SEC on 10 November 2026, with one comparison to its S-1/A of 2 November 2026. The underwriting-fee estimate is from our earlier analysis of the same filing. Sums, ratios and percentages are 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.
