Anthropic files confidential S-1 with the SEC

Anthropic confidentially submitted a draft S-1 to the SEC, taking the first formal step toward a public offering. The release shares almost no detail: no share count, no price range, no schedule. The point of a confidential filing is to start the SEC review without exposing the financials yet. What it does signal is that the company now sees public markets as a realistic option, on top of the $65 billion Series H it recently closed at a roughly $965 billion post-money valuation.

The context around that valuation is the part worth chewing on. TechCrunch puts the current revenue run rate at $47 billion, up from about $9 billion at the end of 2025. That number, not the press release, is what an eventual S-1 will have to defend with audited financials and a product-level breakdown. Anthropic also still pays a large share of its compute spend to Amazon and Google, both of which are investors, so the related-party section will be unusually dense.

Anthropic is not alone in the IPO queue. OpenAI is reportedly preparing its own S-1 after a $122 billion round at $852 billion, and SpaceX is targeting a $2 trillion offering. Public market timing depends on conditions Anthropic does not control, so the filing is best read as optionality, not a date on the calendar.

Why it matters

If you sell to Anthropic or build on Claude, public reporting will soon expose the company's true unit economics, including how it splits revenue with AWS and Google. That visibility will change pricing, partnership terms, and the kind of multi-year commitments Anthropic can credibly make. When the full S-1 lands, read the risk factors first.