Anthropic files confidentially for an IPO at a $965bn valuation

On 1 June 2026 Anthropic confirmed, via its blog, that it confidentially filed a draft S-1 with the SEC — the first formal step towards going public. Confidential means the financials aren't publicly disclosed yet; the company navigates a private review cycle with the regulator before a prospectus becomes public. A full S-1 must be published at least 15 days before any roadshow.

The round behind this filing: a $65B Series H that set a $965B valuation — co-led by Altimeter, Dragoneer, Greenoaks, Sequoia, Capital Group, Coatue, and D1. Investors who set that number had access to the actual financials. The public doesn't yet.

The ~$47B revenue run-rate widely cited is per reporting, not from a public filing. Treat it as a credible signal, not a confirmed figure. When the full S-1 drops, the gross-margin line is the number that matters: frontier-model training is expensive, and whether Anthropic generates margins that justify a near-trillion-dollar valuation is the question the IPO process exists to answer.

Watch for: (1) the SEC comment-and-response cycle, typically 30–60 days; (2) the public S-1 prospectus, which will confirm or revise the $47B run-rate; (3) any shift to the October 2026 target timeline; (4) how OpenAI's parallel filing affects the narrative race between the two leading frontier labs.