Anthropic’s June 1, 2026 confidential S-1 filing with the SEC marks the central catalyst shifting the company from private speculation to formal IPO readiness, with timing now dependent on regulatory review completion and prevailing market conditions. The filing followed a $65 billion Series H round in late May that valued the firm at $965 billion post-money and pushed annualized revenue above $47 billion, underscoring robust enterprise demand for Claude and ample capital access that could influence IPO sizing. As of mid-August, the CFO has begun preliminary investor meetings focused on high-level positioning rather than specific valuation or terms, while analysts flag October or fall 2026 as a plausible window if the SEC process advances smoothly. Traders will monitor any public S-1 amendments, secondary-market share activity, and broader tech IPO sentiment for signals on whether the offering clears the market’s implied deadline.