Polymarket$2.32BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$350.67MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$18.48MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.
Updated Today
As of March 17, 2026, the Polymarket odds for OpenAI IPO Closing Market Cap are: No IPO by December 31, 2026: 64%, 750B–1T: 9%, 1T–1.25T: 9%, 500–750B: 6%, 1.5T+: 4%. These probabilities are derived from real-money trading and update in real time.
OpenAI IPO Closing Market Cap is currently available on Polymarket. Check PredictMarketCap for cross-platform availability as new markets are added regularly.
Prediction market odds reflect the aggregate opinion of traders who risk real money on outcomes. The price of a share (e.g., 65¢) represents the market's implied probability (65%). Prices move as traders buy and sell based on new information, polls, and analysis.
