On what date will Anthropic price its initial public offering (IPO)?

Anthropic’s confidential draft S-1, filed June 1, 2026 cnbc.comreuters.com, formally starts the clock toward an initial public offering. The company is highly motivated to move quickly to lock in the valuation of its recent $65B Series H bridge round anthropic.com and to beat OpenAI—which filed its own draft S-1 on June 8—to the public markets reuters.com. Pre-filing reporting indicated a target listing as early as October 2026 investing.comapp.dealroom.co.

The p10 (September 28, 2026) and p25 (November 2, 2026) estimates reflect a highly efficient process. The procedural path—SEC review, public flip, a mandatory 15-day cooling period sec.gov, and a 1-2 week roadshow—has a practical minimum of roughly 10–11 weeks, as seen recently with SpaceX. Achieving this fast track requires an exceptionally smooth SEC review and underwriters aggressively capitalizing on the currently receptive IPO window.

However, the median estimate of December 15, 2026, anticipates meaningful review friction that makes the October target highly optimistic. SEC comment cycles are highly likely to be prolonged by three major disclosure and operational complexities:

1. Accounting scrutiny: Anthropic books revenue gross for cloud-reseller spend. This is notoriously the single item SEC reviewers scrutinize most heavily and can require time-consuming financial recastings.
2. Regulatory action and sudden export controls: The June 12 US BIS directive forced Anthropic to disable its newly launched flagship Fable 5 and Mythos 5 models globally fortune.comanthropic.comexplainx.ai. Even if near-term revenue impact is contained anthropic.com, this constitutes a brand-new material risk factor—the government's demonstrated ability to "switch off" key products—that forces delicate S-1 amendments.
3. Unresolved litigation: The Department of War's early March supply-chain risk designation remains in effect while a D.C. Circuit ruling (argued May 19) is pending cnbc.comcourtlistener.com, adding further disclosure complexity.

If the SEC review requires multiple comment rounds, pricing could easily miss the pre-holiday window. Holiday seasonality typically freezes new listings, pushing any delayed pricing into Q1 2027. The p75 of April 1, 2027, accounts for a prolonged process comparable to Reddit's ~9-month timeline.

Finally, the p90 extends to April 1, 2028, capturing the non-trivial residual probability that the IPO is delayed multi-year or abandoned entirely. This tail accounts for severe regulatory escalation, a macroeconomic or AI-sector market reversal, or Anthropic ultimately opting to remain private.