Eilers & Krejcik Gaming
Prediction Markets Intelligence

PMI Databook

Daily cross-platform prediction market data and competitive intelligence

Market scale, operator momentum, sports and league activity, and the competitive structure of U.S. prediction markets—all on one normalized dataset spanning 11 tracked U.S. exchanges.

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Updated daily•11 U.S. exchanges•Canonical definitions•137 leagues with traded volume•MLB 26.4% of labeled sports CV•ATP 19.9% of labeled sports CV•ITF 8.7% of labeled sports CV•WTA 8.6% of labeled sports CV•NCAA Football 6.4% of labeled sports CV•Sports Combo 49.9% of Sports CV•Kalshi 85.4% CV share•Proprietary EKG analytics•Exportable data•Data as of Sep 8, 2026

The market, right now

EKG · PMI · tracked U.S. operators · 30 days · as of Sep 8, 2026
Contract Volume (CV), last 30 days
50.0B
+15.9%vs prior 30 days
Up 33.6x on the same 30 days a year earlier, measured on the 3 exchanges live in both windows.
CV Market Share Leader
Kalshi · 85.4%
+0.4 ptsvs prior 30 days
Polymarket U.S. is next at 7.8%, then Nadex at 1.8%. 11 exchanges recorded volume in the window.
Sports share of CV
82.2%
-0.6 ptsvs prior 30 days
137 leagues carried traded volume in the window, led by MLB at 26.4% of labeled sports Contract Volume.
Market scale
Monthly Contract Volume, in billions of contracts
August 2026 Contract Volume ran 16.0x September 2025, and 11 exchanges recorded volume in August against 3 a year earlier.
EKG · PMI · tracked U.S. operators · 12 months through August 2026 · as of Sep 8, 2026
Emerging subcategory
Sports Combo share of Sports Contract Volume, monthly
Multi-leg sports contracts are among the fastest growing contract categories in prediction markets, reaching 49.9% of U.S. sports Contract Volume in August.
EKG · PMI · tracked U.S. operators · 12 months through August 2026 · as of Sep 8, 2026

Football in focus

Seasonality, composition, and operator share within football markets.

Football volume by league
Monthly Contract Volume, football-labeled and excluding combos
NFLNCAA FootballOther leagues
Football remains highly seasonal: August labeled volume ran 5.8x y/y as the new season ramped. Exchanges without reliable league-level metadata are excluded.
EKG · PMI · tracked U.S. operators · 12 months through August 2026 · as of Sep 8, 2026
Football market share
Football-labeled Contract Volume by venue, excluding combos, last 30 days
Kalshi72.4%
Polymarket U.S.14.7%
Novig4.0%
DKEx3.0%
Nadex2.0%
Underdog1.7%
Rothera1.2%
ProphetX1.1%
Football is less concentrated than the market as a whole: Kalshi holds 72.4% of football Contract Volume against 85.4% of all of it, with Polymarket U.S. second at 14.7%.
EKG · PMI · tracked U.S. operators · 30 days · as of Sep 8, 2026

Tracked exchanges

All major U.S. exchanges tracked, with Polymarket Int'l carried as a benchmark.

KalshiPolymarketNadexRotheraCME GroupProphetXForecastExDKeXUnderdogGeminiNovig

From market overview to underlying analysis

Four live tabs, one normalized dataset, updated daily.

The Briefing
Know what matters.
Ten curated views of market scale and mix, operator positioning, emerging entrants, sports and league dynamics, and EKG proprietary analytics.
Velocity Monitor
See what's changing.
Track operator share, growth, new entrants, market mix, and competitive momentum.
Sports Atlas
Map the sports market.
Compare operator sports and league mix, breadth, concentration, seasonality, combo exposure, and long-tail positioning.
Methodology & Coverage
Understand the foundation.
Metric definitions, source basis by exchange, normalization, coverage, and documented limitations.

Why the Databook is different

Made comparable across venues
Common definitions normalize exchange-native reporting into a single cross-platform dataset, with Contract Volume and Execution Volume treated consistently across venues.
Built for gaming analysis
A unified sport and league taxonomy supports like-for-like competitive analysis, while proprietary EKG models translate prediction market activity into gaming-relevant measures and benchmarks.
Transparent by design
Reported, derived, and estimated figures remain clearly distinguished, with source basis, coverage, assumptions, and material limitations documented alongside the data.

Built by Eilers & Krejcik Gaming

PMI Databook is built on more than 14 years of EKG gaming market research, operator benchmarking, product testing, and proprietary industry datasets. EKG is an independent gaming research and advisory firm headquartered in Newport Beach, California, serving operators, suppliers, institutional investors, and other industry stakeholders.

Since 2012, the firm has combined proprietary data, syndicated research, product testing, and senior-level advisory across the gaming industry. Its analysts pair firsthand industry experience with current market coverage and proprietary benchmarks, providing an independent, evidence-based foundation for the Databook.

EKG at a glance
14+ years
Gaming market research
Independent
Research & advisory
Institutional client base
Operators · suppliers · investors
See the Databook in action

Walk through EKG's daily prediction market data and competitive intelligence platform with the team that builds it, or talk to sales about coverage and pricing.

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Eilers & Krejcik Gaming
Source: CME, DKEx, ForecastEX, Gemini, Kalshi, Nadex, Novig, Polymarket U.S., ProphetX, Rothera, and Underdogdata · Eilers & Krejcik Gaming research and estimates