Anthropic announced on June 1 that it has confidentially submitted a draft S-1 registration statement to the U.S. Securities and Exchange Commission for a proposed initial public offering of its common stock. The company said the filing “gives us the option to go public after the SEC completes its review,” with the number of shares and price still undetermined and any offering contingent on market conditions. The earliest possible IPO window is October 2026. The filing comes five days after Anthropic closed its $65 billion Series H round — the largest funding event in AI history, led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital — which set a $965 billion post-money valuation and placed Anthropic above OpenAI’s estimated $852 billion for the first time.
The move opens what has become an explicit IPO race with OpenAI; Sam Altman indicated after learning of the filing that OpenAI would follow shortly with its own registration. Anthropic’s annualized revenue has climbed from roughly $9 billion at the end of 2025 to $47 billion as of May 2026; Q1 2026 revenue reached $4.8 billion, and analysts project Q2 at approximately $10.9 billion — which would represent the company’s first profitable quarter. Claude Code’s run-rate revenue has surpassed $2.5 billion, more than doubling since the start of 2026, with enterprise customers now accounting for over half of all Claude Code revenue; Anthropic estimates its coding agent authors roughly 4% of all public GitHub commits globally. SpaceX — the third blockbuster IPO candidate of 2026 — is scheduled to list on June 12, pointing to what may become one of the most significant public-offering seasons in technology.