Anthropic's S-1 Filing Reveals $17B Revenue, $441B Infrastructure Commitments

The author argues that Anthropic's business is performing strongly, but approximately $441 billion in guaranteed infrastructure commitments expose investors to uncertain future revenue. The author identifies the central operating question as whether revenue can continue growing much faster than compute spending. The author also questions whether plausible sales growth and operating leverage can justify a valuation near $2 trillion.

Anthropic released the prospectus for an initial public offering around 9 AM on October 26. Anthropic's S-1 filing with the Securities and Exchange Commission allows Anthropic to start a roadshow in 15 days. Anthropic could begin trading on Nasdaq under the symbol ANT as early as mid-November. At an anticipated valuation between $1.8 trillion and $2.0 trillion, Anthropic would have the second-largest market debut ever, behind SpaceX. Research teams and individual investors are examining the document, which exceeds 400 pages.

The S-1 shows Anthropic's revenue rose 13 times, from $1.3 billion to $17 billion, in the first six months of 2026 compared with a year earlier. Anthropic recorded an $80 billion GAAP loss for the first half of 2026. Changes in the fair value of convertible notes accounted for most of that non-cash deficit. Excluding that charge and several other items, including equity compensation, Anthropic generated $1.6 billion in adjusted operating income, a margin above 9%.

Anthropic generated $3.93 billion in operating cash flow during the first half of 2026. Anthropic's capital expenditure was below $500 million during that period. Anthropic consequently generated approximately $3.5 billion in positive free cash flow.

Anthropic's revenue is growing faster than the data center capacity costs associated with Claude, Fable and Mythos. Anthropic's first-quarter sales were 40% higher than AI infrastructure costs. Anthropic's second-quarter revenue of $11.6 billion exceeded twice the $5.6 billion compute expense. The S-1 identifies 11,000 enterprise customers generating more than $100,000 each in annual revenue, compared with 1,500 last year.

Anthropic holds $122 billion in cash and short-term investments. Anthropic raised $65 billion in a funding round in late May. The IPO is expected to raise another $100 billion. Anthropic's reserves are expected to exceed $200 billion by late this year.

The S-1 lists seven contracts classified as infrastructure service agreements or infrastructure equipment leases, involving partners including Microsoft, Amazon and SpaceX. Those agreements total $630 billion, and 70% of that dollar value is non-cancellable. Anthropic must pay for the reserved capacity even if Anthropic does not use the capacity.

Anthropic is expanding beyond leasing capacity from providers such as Microsoft to a hybrid approach that sometimes involves purchasing chips and equipping dedicated centers operated by others. Under the leasing approach, the provider pays for and installs GPUs and other equipment accounting for approximately 80% of a data center's cost. The author characterizes the hybrid approach as highly capital-intensive and new for Anthropic, judging from Anthropic's small capital expenditure so far.

Most infrastructure contracts appear to last seven years or less. The author estimates that the guaranteed commitments require coverage of at least $60 billion annually through rapidly growing sales. Anthropic states an intention to obtain compute beyond existing commitments and expand Anthropic's own data center footprint for additional long-term capacity. The author expects capacity-related cash spending to rise sharply and hopes revenue will continue growing faster.

Anthropic's board can issue additional shares equal to 2% of outstanding shares to the philanthropic Anthropic Public Benefit Fund whenever the stock rises 50% above a benchmark. The author assumes the benchmark would initially be the offering price. The author argues that each such issuance would leave existing shareholders owning 2% less of the business. The author warns that shareholders would remain worse off if the stock subsequently returned to the earlier price.

The author concludes that Anthropic currently meets the key operating test by increasing revenue much faster than compute costs. However, the author warns that disappointing sales growth could leave Anthropic with committed costs rising faster than revenue, creating a potentially disastrous outcome.