Anthropic files confidential S-1, setting stage for blockbuster U.S. IPO

Anthropic, the AI lab behind the Claude family of models, has confidentially submitted a draft registration statement on Form S-1 to the U.S. Securities and Exchange Commission for a proposed initial public offering of its common stock. The company disclosed the filing on June 1, 2026, stating that the move gives it the option to go public once the SEC completes its review, with the timing of any offering dependent on market conditions and other factors. Anthropic emphasized that the number of shares to be offered and the price have not yet been set, and it has not publicly specified the size or structure of the deal in its Rule 135 announcement or related statements.

The confidential filing follows Anthropic’s late-May funding round of approximately $65 billion, which valued the company at about $965 billion post-money, making it one of the highest-valued private AI companies globally and edging ahead of rival OpenAI’s most recent reported valuation. Media and analyst reports have discussed potential listing windows and valuation targets approaching or exceeding the prior private round, and some third-party analyses report that Anthropic has picked Morgan Stanley, Goldman Sachs, and JPMorgan Chase as lead underwriters. However, these details originate from secondary commentary and have not been confirmed in Anthropic’s own public announcement.

Crucially for investors tracking deal mechanics, Anthropic has not yet disclosed an IPO price range, a final IPO valuation, the stock exchange on which it intends to list, or a definitive underwriter syndicate in any public SEC filing or company news release. The confidential S-1 structure allows the company to keep its detailed financials and terms out of public view until closer to a potential roadshow, when a public version of the prospectus and a price range would be filed. Until that public S-1 appears, specific figures for IPO pricing, offering valuation, exchange selection, and bookrunners remain provisional market expectations rather than confirmed deal terms.