Anthropic is preparing for a potential September or early October 2026 initial public offering after confidentially filing a draft Form S-1 with the SEC (U.S. securities regulator) on June 1, 2026. Morgan Stanley, Goldman Sachs, and JPMorgan are leading the underwriting effort. In investor meetings that began in mid-August 2026, the Claude developer has emphasized frontier model performance, healthcare and biology applications, and the strategic argument for its position near the top of the AI market rather than leading with detailed financial slides. Executives are also addressing pressure from lower-cost Chinese AI rivals, arguing that advanced model performance supports premium pricing. The setup follows a $65 billion Series H funding round in May 2026 that valued Anthropic at $965 billion post-money, while its annualized run-rate topped $47 billion as of the same month. Founded in 2021 by Dario Amodei, Daniela Amodei, and former OpenAI colleagues, Anthropic built its profile on a safety-focused research approach and Constitutional AI (a method for steering model behavior through rule-based principles) before turning that into commercial growth through the Claude family and cloud partnerships. The IPO timing also carries competitive weight because OpenAI is similarly considering a public listing, leaving investors focused on whether Anthropic’s registration becomes effective on schedule, how it defines its competitive moat in the public filing, and whether the September window holds if equity markets weaken heading into fall.