Anthropic has officially filed to go public

Details

The Verge reports Anthropic filed to go public Monday with a confidential Form S-1 to the SEC. The filing follows last week's $65 billion Series H that gave Anthropic a $965 billion post-money valuation, edging out rival OpenAI's $852 billion to become the world's most valuable startup. Share count, price, and timing remain unset.\n\nThe competitive dynamics are dense. SpaceX—set to IPO June 12 at a $1.75 trillion valuation—is simultaneously a competitor to Anthropic (via xAI) and a data center supplier at $15 billion per year. Anthropic's filing comes after OpenAI won a recent legal battle: a judge dismissed all of Elon Musk's claims against OpenAI due to the statute of limitations, removing one legal overhang from its own IPO preparation.\n\nOpenAI's IPO is widely expected later in 2026, potentially targeting the fall. All three major AI entities—Anthropic, OpenAI, and SpaceX/xAI—are racing to secure public market capital to fund frontier model training as compute costs continue to climb. Anthropic's decision to file confidentially means the detailed financials and risk factors won't be public until later in the SEC review.