Prediction Markets Record All-Time High $4.9B Volume to End 2025
Alex Smith
2 months 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
Maine Senate Primary Odds Tilt to Platner as Prediction Markets Signal Key Senate Flip Opportunity
Prediction markets show Graham Platner at ~80% odds to win Maine’s Democratic Se...
PredictIt Rolls Out New Design After Surviving CFTC Shutdown Attempt
The academic prediction market platform focused on politics modernizes its inter...
Democrats 85% to Flip the House in 2026 Midterms, Senate Still a Toss-Up
Prediction markets are forecasting an 85% chance of House control flipping to De...
Kalshi Hits Record $3.4B Week, Polymarket Sports Surge as March Madness Heats Up
Kalshi posted a new record $3.40 billion notional volume week as Polymarket's sp...