Reports / May 2026
Monthly report
May 2026: $27.53B traded on prediction markets
Notional volume across 7 exchanges was $27.53B, +7.0% from April. Kalshi led with a 65.1% share. The busiest day was Sat May 9, 2026, at $1.22B.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Kalshi | $17.91B | 65.1% | +21% |
| 2 | Polymarket | $7.06B | 25.7% | −21% |
| 3 | Polymarket US | $1.77B | 6.4% | +40% |
| 4 | Crypto.com | $726M | 2.6% | +2.8% |
| 5 | Gemini | $38.2M | 0.1% | +26% |
| 6 | ForecastEx | $23.7M | 0.1% | −28% |
| 7 | Robinhood | $2.1M | <0.1% | new |
What traded
At exchanges that publish a split.
Sports, single-leg 63%Combos (parlays) 24%Non-sports 13%
Daily average: $888M over 31 days
Busiest days
- Sat May 9, 2026: $1.22B
- Sat May 30, 2026: $1.19B
- Sun May 24, 2026: $1.04B
- Sun May 10, 2026: $1.03B
- Sun May 31, 2026: $975M
May 2026: questions
How much volume did prediction markets trade in May 2026?
$27.53B in notional volume across 7 exchanges, up 7% from April. That is $888M a day on average.
Which prediction market had the most volume in May 2026?
Kalshi. The top three were Kalshi ($17.91B, 65.1%), Polymarket ($7.06B, 25.7%), Polymarket US ($1.77B, 6.4%).
How much prediction market volume was sports in May 2026?
87% at the exchanges that publish a split, including 24% in combos (parlays). Non-sports markets were 13%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports