Anthropic files confidential draft S-1 with SEC for IPO days after $65B Series H at $965B valuation

On June 1, 2026 Anthropic confidentially submitted a draft registration statement on Form S-1 to the U.S. Securities and Exchange Commission for a proposed initial public offering, thrusting the maker of the Claude AI models into a 2026 IPO race alongside SpaceX and OpenAI. The filing came less than a week after Anthropic closed a $65 billion Series H round — co-led by Altimeter Capital, Dragoneer, Greenoaks, Sequoia Capital, Capital Group, Coatue and D1 Capital Partners — that lifted its post-money valuation to roughly $965 billion (approaching $1 trillion).

A confidential S-1 lets the company iterate with SEC reviewers before the prospectus becomes public; Anthropic has not yet set the number of shares, price range, ticker or exchange, and timing remains subject to market conditions. Reporting cited a revenue run-rate that had surpassed roughly $47 billion, up from about $9 billion at the end of 2025, more than 300,000 business customers, and over 1,000 firms each spending more than $1 million a year on Claude. Bankers including Goldman Sachs, JPMorgan and Morgan Stanley were said to be in active conversations, with a potential offering exceeding $60 billion that could rank among the largest IPOs ever; a market-consensus (not company-confirmed) listing date of roughly October 2026 circulated.

The disclosure is a landmark capital-markets event: one of the highest-valued private companies ever to begin the public-listing process, and a bellwether for whether frontier-AI labs can access public equity markets.