Anthropic, the AI research company behind the Claude family of models, has confidentially filed a draft Form S-1 with the SEC, a formal step toward a potential public offering in late 2026. The filing, submitted on June 1, 2026, puts Anthropic on the short list of the most consequential tech listings in recent memory. Anthropic’s annualized revenue run rate surpassed $47 billion by late May 2026. Before the S-1, Anthropic closed a Series H funding round worth $65 billion in May 2026, pushing its post-money valuation to $965 billion. Major institutional backers include Google, which holds an estimated 14% stake, alongside Amazon, Microsoft, and Nvidia. The timing of the actual offering remains contingent on SEC review and broader market conditions.