Anthropic Files S-1, and Prediction Markets Now See a 2026 IPO as Near Certain

Anthropic has taken the first formal step toward going public. On Monday, November 2, the artificial intelligence company filed a Form S-1 registration statement with the Securities and Exchange Commission. That document is the one companies submit before they can offer shares to the public in the United States, and it is the clearest signal yet that the maker of the Claude models is preparing to list its stock.

The filing also moved prediction markets, where traders have been betting on whether an Anthropic IPO will happen this year. Many now describe a 2026 listing as close to certain. Those prices reflect what people are willing to wager on an outcome, so they show sentiment rather than a company commitment to a date.

An S-1 is a registration, not a guarantee. Companies often revise their filings, adjust terms, or wait for better market conditions before pricing a deal. Key details such as the offering size, the expected share price, and the listing exchange usually come later, through amended filings as the SEC review proceeds.

For the wider AI sector, the filing is a test of how much public investors want exposure to a company whose spending and valuation draw close attention. A successful listing would give ordinary investors a direct stake in one of the field's best-known labs, which has so far been funded through private investment.