Prediction Markets Record All-Time High $4.9B Volume to End 2025
Alex Smith
1 month ago
The year started with a whisper and ended with a roar for prediction markets as combined notional volume surpassed $4.9 billion for the week of Dec. 29, led by Opinion Labs, Kalshi and Polymarket, respectively.
As 2026 begins, the data suggests prediction markets are comfortably out of their exploratory phase and into a full-on growth sprint, posting record notional trading volumes with each new week. Meanwhile, onchain prediction exchange Opinion has become impossible to ignore. Opinion posted $1.81 billion in notional volume to close out the year as the market leader, though Kalshi and Polymarket remain the most relevant platforms for institutional partnerships and mainstream adoption.
Both Kalshi and Polymarket also post all-time high weekly volumes to close out 2025: Kalshi $1.71B (Dec. 22-28) and Polymarket $1,45B (Dec. 29 – Jan. 4).
Weekly notional volume snapshot (Dec. 29 – Jan. 4):
PlatformWeekly Notional VolumeShare of TotalOpinion$1,809,464,85636.90%Kalshi$1,576,002,26832.10%Polymarket$1,445,093,13629.40%Predict$71,754,8441.50%Myriad$2,786,513Related Articles
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