If Anthropic’s IPO had been completed on 30 September, it would have recorded $8.2 billion of cumulative stock-based compensation expense for its restricted stock units on that date, according to the amended Form S-1 it filed with the SEC on Monday, 2 November.
The original Form S-1, filed on 26 October, gave $2.9 billion for an IPO completed on 30 June. The increase is about $5.3 billion, by our arithmetic.
The key insight: Anthropic’s amended S-1 says an IPO completed on 30 September would have triggered $8.2 billion of cumulative RSU stock-based compensation expense, up from $2.9 billion for 30 June in its 26 October filing.
The filing says the RSUs vest on a service condition and on a performance condition that “will be satisfied upon the effectiveness of the registration statement of which this prospectus forms a part”, and that “As of September 30, 2026, no stock-based compensation expense had been recognized for such RSUs because a qualifying event as described above was not probable”.
It says “If this offering had been completed on September 30, 2026, we would have recorded $8.2 billion of cumulative stock-based compensation expense related to the RSUs on that date”, and that an additional $24.1 billion of unrecognised RSU expense would be recognised over a weighted-average period of approximately 2.0 years.
The 26 October filing put those amounts at $2.9 billion and $23.7 billion, with the remainder recognised over approximately 2.1 years. Anthropic also reported unrecognised expense of approximately $2.1 billion for other outstanding equity awards as of 30 September, against approximately $3.1 billion as of 30 June.
Stock-based compensation for Anthropic’s RSUs if its IPO had been completed on 30 June or 30 September 2026: cumulative expense recorded at that date and unrecognised expense recognised afterwards, in billions of dollars. Source: Anthropic PBC, Form S-1 (26 October 2026) and Form S-1/A (2 November 2026).
The Stock Pay Already Recorded
Stock-based compensation already included in the income statement was $1.1 billion in the third quarter of 2026, against $1.3 billion in the second quarter and $305 million a year earlier, according to the quarterly results in the amended filing. For the nine months it was $3.3 billion, against $591 million.
Personnel expense fell to $1,711 million in the third quarter from $1,857 million in the second. The filing says the decrease was “primarily driven by lower stock-based compensation expense due to certain option awards becoming fully vested, partially offset by higher cash compensation resulting from headcount growth”.
The People Behind the Numbers
As of 30 September, Anthropic had approximately 5,300 employees, the filing says. It reports that from 30 September 2025 to 30 September 2026, “TTM revenue increased approximately 1,200% while headcount increased approximately 170%, driving TTM revenue per employee from $1.4 million to over $6.6 million”.
The $8.2 billion IPO-date figure is about 48% of Anthropic’s third-quarter revenue of $16,956 million, by our arithmetic. The filing’s $2.0 billion third-quarter donation-matching charge is covered in our piece on Anthropic’s compute bill.
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As we read the two filings, the RSUs already granted carry no expense until the registration statement becomes effective, so the cost builds off the income statement and lands in the IPO quarter.
As we read the quarterly lines, the stock pay already recorded fell to $1.1 billion in the third quarter from $1.3 billion in the second, which the filing ties to option awards becoming fully vested.
Anthropic’s amended Form S-1
“In the quarter in which this offering is completed, we will begin recording stock-based compensation expense”
Three Implications
FOR IPO INVESTORS The amended filing says a further $24.1 billion of RSU expense would be recognised over a weighted-average period of approximately 2.0 years after an IPO completed on 30 September.
FOR EMPLOYEES The amended filing says the RSUs vest on a service condition and on the registration statement becoming effective.
FOR ANALYSTS The amended filing reports stock-based compensation of $3.3 billion for the first nine months of 2026, against $591 million a year earlier.
The framework says: “The new job of finance is to manage the ratio between the two โ work produced per token burned.”
As we read it, Anthropic reports one company-level version of that ratio for people rather than tokens: TTM revenue per employee of over $6.6 million with approximately 5,300 employees. The framework is the owner’s argument and does not discuss this filing.
The $8.2 billion is the filing’s figure for an IPO completed on 30 September; the amount recorded will depend on when the offering is completed. The amended filing leaves the number of RSUs granted after 30 September and their expected expense blank. The 48% comparison and the $5.3 billion increase are our arithmetic.
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Anthropic’s amended S-1 says an IPO completed on 30 September would have triggered $8.2 billion of cumulative RSU stock-based compensation expense, up from $2.9 billion for 30 June in the 26 October filing, with a further $24.1 billion to be recognised over about two years. Stock pay already in the income statement was $1.1 billion in the third quarter.
A note on sourcing. Figures and quotations are from Anthropic’s amended Form S-1 filed with the SEC on 2 November 2026 and its Form S-1 filed on 26 October 2026; quarterly figures are unaudited. The $5.3 billion increase and the 48% comparison are our arithmetic.
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.
