Anthropic, PBC 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 filing under Rule 135 of the Securities Act of 1933 grants an option to proceed post-SEC review, subject to market conditions; share count and pricing are unspecified (Anthropic, https://www.anthropic.com/news/confidential-draft-s1-sec). This follows the $65 billion Series H round at $965 billion post-money valuation led by Altimeter Capital, Dragoneer, Greenoaks and Sequoia Capital.

Additional updates cite Claude Opus 4.8 performance gains and the Milan office opening as Europe's sixth location. No offers or solicitations are made outside registration requirements.