Will Anthropic file an S-1 with the SEC at a $400B valuation by 31 October 2026?
Posted 2026-06-15 — 138 days before the deadline, stated before the outcome.
Anthropic is an artificial intelligence company that develops large language models and enterprise software. An S-1 filing is a formal registration statement submitted to the U.S. Securities and Exchange Commission, typically preceding a public stock offering.
The claim
By 2026-10-31, Anthropic files an S-1 (or confidential equivalent) with the SEC at a target valuation of at least $400 billion
Reasoning trace
- SpaceX IPO success sets template (Yahoo: 'SpaceX IPO is a model for Anthropic and OpenAI')
- Apollo/Blackstone $36B private credit deal already priced Anthropic above $300B implicitly
- Competitive pressure with OpenAI IPO filing accelerates timeline
- S-1 filing or confidential submission
Evidence so far
35 confirming · 0 denying signals · 5 verified · 1 broken assumptions. The evidence itself is part of the full dossier.
Probability history
Updated 88 times since mint (last on 2026-09-27) — 6% at mint → 79% today.
What to watch
- milestone Anthropic completes a final round of pre-IPO due diligence and legal structuring, evidenced by the appointment of a lead underwriter or the filing of a Form S-1/A or similar preliminary document. observed
- milestone Anthropic announces a confidential submission of its registration statement to the SEC observed
- leading indicator Anthropic announces a new primary or secondary share sale at a post-money valuation of at least $400 billion observed
The full dossier behind this prediction — the evidence trail, the risk analysis, the monetization scenarios — is available on request: [email protected].
Probabilities are calibrated against the system's own resolved history; after the deadline the outcome is resolved and audited — including the calls we get wrong. Nothing on this page is investment advice.