Will Anthropic IPO by November 19, 2026?

Price jumped 7pts in a day and sits 5pts off our last stored estimate, on a leg with a sharp 6.5%->32.5%->56.5% price staircase across adjacent Anthropic IPO date-legs, flagged for a fresh look.

Amended S-1 filed Nov 2 with Q3 financials; Nov 9 reporting (FNNews) says Anthropic is targeting IPO completion before Thanksgiving (Nov 26) with a lowered valuation target, not a specific Nov 19 date. The staircase jump from 6.5% (Nov18) to 32.5% (Nov19) to 56.5% (Nov20) shows the market has already priced a likely pricing/listing date around Nov 19-20 (a Thursday, typical Nasdaq IPO debut day) off the same reporting we found. Our independent estimate (~32%) matches the market price, so there is no edge to trade.

Considered betting

YES (it happens)

Our estimate

33% chance YES

Would have paid

34¢ per YES share

Market

33% chance YES

Date

today

• Anthropic IPO by November 18, 2026?: 6.5% yes
• Anthropic IPO by November 19, 2026?: 32.5% yes (this leg)
• Anthropic IPO by November 20, 2026?: 56.5% yes

• www.cnbc.com/2026/11/02/anthropic-ant-s-1-quarter-financials
  Anthropic filed amended S-1 with Q3 financials on Nov 2, 2026, before market's expected Nov 19-20 pricing window.
• en.fnnews.com/news/202611090906290990
  Nov 9, 2026 FT-sourced report: Anthropic plans to complete IPO before Thanksgiving (Nov 26), lowering valuation target from $2T to $1.25-1.75T.

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