Anthropic's IPO Filing Details Revenue, Compute Costs and Co-Founder Giving

The filing of Anthropic's S-1 on Monday — a document running beyond 300 pages — amounts to the fullest public account yet of how a pure-play artificial intelligence laboratory earns its money, as the company positions for a listing expected to rank among the largest on record. The prospectus reports $16.29bn of revenue in the first half of 2026 against $2.38bn in cost of revenue, an implied gross margin of 85%, and sets that revenue against $1.16bn in the same period of 2025.

Compute dominates the cost base. The filing states that "substantially all of cost of revenue" is associated with compute and infrastructure, and warns that operating and adjusted operating margins will "fluctuate over time, particularly in periods when substantial incremental compute is delivered to us and we incur the associated expenses." It adds that Anthropic had previously sought quantities of compute from cloud providers "in excess of what those partners were willing to provide", and that it has "historically operated in a compute-constrained environment". Growth decelerated sharply: roughly 144% in the second quarter over the first, then about 47% in the third.

Governance and giving are folded together. Structured as a public benefit corporation, Anthropic grants its seven co-founders, including chief executive Dario Amodei, a single Class F share carrying 50.1% of total voting power over shareholder matters; the filing describes the arrangement as having "no direct public company precedent". Each co-founder owns more than 200 million shares. The co-founders have pledged 80% of their personal stock to charitable causes, gifts that could together be worth $80bn, alongside 5% of company equity for a public-good fund and a further 2% for each sustained 50% rise in the share price above the IPO level. New employees are offered a donation match — up to 50% for those hired before May 2024 and 25% for later hires — and just over half of staff have pledged at least some equity.

Philanthropy specialists greeted the pledges with qualified approval. Vandana Arcot, founder and chief executive of the strategy firm Komselj, called the plan "admirable" and "well-designed", saying that embedding it in pay "makes generosity the default, not the exception", though her assessment would turn on "who sits on the decision-making body, how recipients are chosen, and what gets reported". Bella DeVaan of the Institute for Policy Studies noted that the pledges are not legally binding and can be revoked, describing voluntary giving as no substitute for structural reform. Hans Peter Schmitz of North Carolina State University said he applauded the promotion of generosity from the top down. Anthropic did not respond to a request for comment.

The valuation itself remains undisclosed, to be "determined by negotiations among us, the selling stockholders, and the representatives"; analyst estimates reported by CNBC span $1 trillion to $2 trillion. The pricing of the shares is the next marker.