Anthropic IPO by December 15, 2026 priced at 81.5% on Polymarket, down 11.0 points, on $327K traded
PredictionBubbles' movers board, on the same Oct. 31, 05:54 UTC crawl, lists the December 15 Anthropic IPO contract among its largest downward finance moves, in a…
Polymarket’s contract on whether Anthropic will hold an IPO by December 15, 2026 was priced at 81.5%, down 11.0 probability points over 24 hours, with $327K traded. According to PredictionBubbles’ movers board, the contract was among the largest downward moves in finance in the Oct. 31, 05:54 UTC crawl.
The snapshot, reported Oct 31, 2026 at 1:54 AM ET, still showed the market pricing an IPO before the deadline as more likely than not. The decline reflects a shift in traders’ expectations, rather than confirmation of any change to Anthropic’s plans.
What the board measures
According to predictionbubbles.net, its rankings compare market-implied probabilities over 24 hours using prices from Polymarket and Kalshi. The supplied page identifies its venue-data timestamp as 31 Oct 2026, 05:40 UTC and says the board refreshes every 15 minutes.
The ranking covers 2,039 markets that live longer than 14 days. Only open contracts with a valid day-earlier comparison qualify; resolved markets and contracts too new to have that baseline are excluded. Moves are ranked by their size in probability points, not by relative percentage changes.
What remains unclear
The supplied material does not identify a company announcement, filing or other specific catalyst for the Anthropic contract’s decline. It therefore establishes a repricing, but not the reason behind it.
The $327K traded provides activity context, but the supplied Anthropic summary does not specify the volume window or order-book depth. PredictionBubbles says volume and liquidity do not affect its movers ranking, which measures price changes rather than the strength of trading behind them.
What it means for prediction markets
- Timing is central: The contract concerns an Anthropic IPO by December 15, 2026, not whether the company will eventually go public.
- Direction and level tell different stories: The 11.0-point decline is substantial, while the remaining 81.5% price still favors an IPO within the deadline.
- The catalyst is unverified: The board documents changing market expectations; the supplied material does not establish new information about Anthropic’s IPO plans.
Sources & attribution
- [1]Predictionbubbles (predictionbubbles.net)https://predictionbubbles.net/markets/movers/
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