Anthropic IPO 2026

Nasdaq's trader notice puts Anthropic's Class A shares on the Global Select Market under ANT from November 19, and Polymarket's date book agrees: November 19 is 85.45%, November 20 7.2% and No IPO by November 30 2.3%.

The money is on how big it closes. Polymarket's closing market cap board turned $795,871 in a day on $603,577 of open interest. $1.25–1.5T leads at 36.25%, ahead of $1.5–1.75T at 27.15%, under $1.25T at 19.15% and $1.75–2.0T at 13.95%. The under-$1.25T leg took the most money, $192,825.

This page follows listing day: the closing market cap on three boards, the valuation at the offer, the date, and where Anthropic stands among 2026's listings.

Polymarket splits the close across two boards. The middle-bracket board puts 1.2–1.5T at 37.25%, 1.5–1.8T at 28.8% and 1.8T+ at 17%. Manifold's ladder reads higher at the top: 1.5 trillion or higher 65%, 1.8 trillion or higher 33% and 2 trillion or higher 10%.

The open strike is $1.5T. Polymarket's above $1.5T is 43.85%, against Manifold's 1.5 trillion or higher at 65%, a 21-point gap on the same threshold. One rung up, Polymarket's above $1.75T is 16.5%.

The offer valuation splits almost evenly. Polymarket has $1.50–1.75T at 46.6% and $1.25–1.50T at 45.65%, on $47,040 in a day. Kalshi's announcement book has Before Dec 1, 2026 at 97.5%. On Polymarket's largest-2026-IPO board, SpaceX leads at 87.9% and Anthropic is 10.5%.

• The close on November 19. The market cap boards settle on the close of the first trading day; a slip moves the date book first, where November 20 is 7.2%.
• The $1.5T line. Polymarket prices a close above it at 43.85%, Manifold at 65%.
• The offer price. The valuation board is split 46.6% to 45.65% between $1.50–1.75T and $1.25–1.50T; a final price range would move every board on this page.
• The low tail. Under $1.25T is 19.15% and drew the most money in the past day, $192,825.

• Data Technical News #2026 - 28 Anthropic, PBC Initial Public Offering on Nasdaq Global Select Market
• Nasdaq IPO Calendar — Nasdaq's calendar of upcoming, priced and filed IPOs.
• Newsroom — Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.