Anthropic has pushed back its initial public offering from a planned September debut to November, according to a recent report. The San Francisco-based AI company remains the most valuable AI startup after a May 2026 Series H round valued it at $965 billion, and prediction markets have shifted against a September listing.
IPO timeline pushed to November
Anthropic's IPO has been delayed to November, according to a recent report, after the company had initially been slated for a September debut. The delay comes amid high market anticipation, as the company remains the most valuable AI startup following its Series H funding round in May 2026.
That round valued the company at $965 billion. Anthropic also recently unveiled its Claude Opus 5.5 model, a development that may factor into long-term market expectations for its valuation at listing.
Prediction markets shift on listing odds
The delay has shown up directly in prediction-market pricing. Odds tracked on Polymarket for an Anthropic IPO by September 30, 2026 have fallen to just 0.1%. Odds for a listing by December 31, 2026, by contrast, stand at 76.5%. Market pricing also suggests uncertainty around Anthropic's market cap expectations at IPO, with a moderate decrease in odds that the company lists at a market cap of less than $1.25 trillion.
What comes next
Investors are now watching for further announcements on IPO specifics, including filing updates or roadshow plans that could shape pricing. Changes in strategic investor activity or new financial disclosures could also move market expectations before the listing.
Observers will watch whether Anthropic meets its revised November timeline.
Source: Crypto Briefing
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