Reports / May 2025
Monthly report
May 2025: $2.00B traded on prediction markets
Notional volume across 3 exchanges was $2.00B, +13% from April. Polymarket led with a 66.7% share. The busiest day was Sun May 18, 2025, at $122M.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Polymarket | $1.34B | 66.7% | +2.0% |
| 2 | Kalshi | $664M | 33.2% | +44% |
| 3 | ForecastEx | $1.1M | 0.1% | +174% |
What traded
At exchanges that publish a split.
Sports, single-leg 77%Combos (parlays) 0%Non-sports 23%
Daily average: $64.5M over 31 days
Busiest days
- Sun May 18, 2025: $122M
- Wed May 7, 2025: $85.8M
- Sun May 4, 2025: $83.9M
- Tue May 6, 2025: $80.4M
- Thu May 29, 2025: $71.7M
May 2025: questions
How much volume did prediction markets trade in May 2025?
$2.00B in notional volume across 3 exchanges, up 13% from April. That is $64.5M a day on average.
Which prediction market had the most volume in May 2025?
Polymarket. The top three were Polymarket ($1.34B, 66.7%), Kalshi ($664M, 33.2%), ForecastEx ($1.1M, 0.1%).
How much prediction market volume was sports in May 2025?
77% at the exchanges that publish a split, including 0% in combos (parlays). Non-sports markets were 23%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports