Reports / September 2026
Monthly report
September 2026: $80.77B traded on prediction markets
Notional volume across 10 exchanges was $80.77B, +58% from August. Kalshi led with a 75.3% share. The busiest day was Sun Sep 27, 2026, at $4.56B.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Kalshi | $60.85B | 75.3% | +52% |
| 2 | Polymarket US | $8.70B | 10.8% | +128% |
| 3 | Polymarket | $4.37B | 5.4% | −6.3% |
| 4 | DraftKings | $1.81B | 2.2% | 21.6× |
| 5 | Crypto.com | $1.66B | 2.1% | +71% |
| 6 | Novig | $1.45B | 1.8% | opened Aug 4 |
| 7 | Robinhood | $1.16B | 1.4% | +95% |
| 8 | Underdog | $721M | 0.9% | +108% |
| 9 | Gemini | $44.1M | 0.1% | +19% |
| 10 | ForecastEx | $19.5M | <0.1% | −18% |
What traded
At exchanges that publish a split.
Daily average: $2.69B over 30 days
Busiest days
- Sun Sep 27, 2026: $4.56B
- Sun Sep 20, 2026: $4.22B
- Sat Sep 26, 2026: $4.11B
- Sat Sep 19, 2026: $3.99B
- Sun Sep 13, 2026: $3.44B
September 2026: questions
How much volume did prediction markets trade in September 2026?
$80.77B in notional volume across 10 exchanges, up 58% from August. That is $2.69B a day on average.
Which prediction market had the most volume in September 2026?
Kalshi. The top three were Kalshi ($60.85B, 75.3%), Polymarket US ($8.70B, 10.8%), Polymarket ($4.37B, 5.4%).
How much prediction market volume was sports in September 2026?
86% at the exchanges that publish a split, including 55% in combos (parlays). Non-sports markets were 14%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports