Anthropic’s S-1, by the numbers: A thriving business—with a $441 billion asterisk

On October 26th, Anthropic released its long-awaited prospectus for an initial public offering, revealing a thriving business. The company filed its S-1 with the SEC, allowing it to begin a roadshow in 15 days and go public as early as mid-November under the symbol ANT on the Nasdaq. If the anticipated valuation of $1.8 to $2.0 trillion comes to fruition, Anthropic would become the second largest market debut of all time, just behind SpaceX.

Anthropic's current financial performance looks solid, with revenues exploding 13-fold from $1.3 billion to $17 billion over the same period in 2026. However, the income statement reveals a significant loss of $80 billion during the first half of 2026, primarily due to non-cash charges from convertible notes and other adjustments. Despite this, the company generated an adjusted operating income of $1.6 billion for the same period, with a 9%+ margin.

For the first half of 2026, Anthropic collected $3.93 billion in cash from operations and incurred only $500 million in capital expenditures (capex), resulting in positive free cash flow of around $3.5 billion. Operating leverage, the ability to expand margins by growing revenues faster than costs, is also positive. In Q1, sales exceeded AI infrastructure costs by 40%, and in Q2, revenues more than doubled to $11.6 billion, compared to $5.6 billion for compute.

The company's customer base includes 11,000 enterprises with annual revenue exceeding $100,000, a significant increase from 1,500 last year. Anthropic holds $122 billion in cash and short-term investments, following a $65 billion round of funding in late May, which is expected to increase its reserves to over $200 billion by the end of the year upon completion of the IPO.

However, Anthropic faces enormous guaranteed costs from seven infrastructure service agreements and equipment leases with partners like Microsoft, Amazon, and SpaceX, totaling $630 billion. A significant portion of these arrangements are non-cancellable, meaning Anthropic must pay regardless of usage. The company is now pursuing a hybrid approach, buying chips and equipping dedicated centers operated by others, which requires substantial capital investments.

The S-1 shows that Anthropic's cash outlays for capacity will skyrocket, but the company hopes to continue its current trend of revenue growth outpacing compute costs. However, the $441 billion in guaranteed commitments is a concern for investors, as it requires significant sales to cover. Additionally, the board has the authority to issue an extra 2% of outstanding shares whenever the stock appreciates 50% over a benchmark, diluting existing shareholders' ownership.