Prediction Market Volume Hits Record $4.13B a Day in October

Prediction market volume reached its highest point on record in October, with yes-or-no exchanges averaging $4.13 billion in daily trading. That is a 55% jump from September. The surge arrived with the sporting calendar at its fullest, as college football and the NFL ran at full tilt and the 2026-27 NBA season tipped off in the middle of it all.

Open interest, which measures the value of positions still live rather than settled, climbed 45% month over month to $3.27 billion and set a record of its own in the process. The figures come from Jefferies analyst Daniel Fannon, who tracks activity across the sector’s main venues. Growth at this pace would stand out in any industry, but it lands in one fighting legal battles across several US states at the same time.

Prediction Market Volume Climbed Across Every Category

The growth spread evenly. Sports contracts averaged roughly $2.98 billion a day, up 55% on the month, while non-sports categories rose by exactly the same rate to reach $843 million. Both halves of the market moved in step, which rarely happens in a sector where political cycles and sporting seasons pull in different directions.

Sports held 78% of total prediction market volume, unchanged from September. Its grip on open interest tightened considerably though, climbing to 83% from 73% a month earlier. That shift suggests traders are holding sports positions open for longer instead of flipping them game by game.

Weekend Parlays Are Becoming a Product Line

Fannon also flagged a pattern in combination contracts, which bundle several outcomes into a single position much like a sportsbook parlay does. Activity in those contracts rises over weekends. Traders appear comfortable stacking several football predictions into one position rather than taking them one at a time, and the weekend spike tracks the football schedule almost exactly.

DraftKings’ DKeX stands out here. The platform carries a higher proportion of combination contracts than its rivals on weekdays and weekends alike, pointing to a product built around sports and multi-event trading from the ground up. That puts a meaningful slice of its prediction market volume in a format most casual bettors already recognise.

Polymarket Keeps Its Lead as Smaller Venues Surge

Polymarket averaged $655 million in daily prediction market volume last month, a 50% rise on September and a 395% increase against October 2025. Its share of the platforms Jefferies tracks stayed flat at 17%. Holding a share steady while the wider market grows by more than half means the platform kept pace with everyone around it, which gets harder the bigger a venue becomes.

The other venues in the report combined for $309 million a day, up 56% on the month and 710% year over year, for a steady 7% share. Rothera is the newcomer. Robinhood launched the exchange in June as a joint venture with market maker Susquehanna International Group, and it averaged $49 million a day across October. Its volume grew 55%, in line with the field, but its share of industry activity slipped to 1.2% from 1.5%.

Politics Carried the Non-Sports Side

Non-sports prediction market volume reached $843 million a day, matching the sports growth rate at 55%. The US midterm cycle built through the whole of October, and political contracts were the sector’s original product long before sports arrived. Election Day fell on November 4, so the real question now is what replaces that demand.

Cryptocurrency and financial market contracts are the obvious candidates. Both categories already run on the major exchanges, and both have the advantage of trading continuously instead of resolving on a single date. November will test how much of October’s non-sports activity came from the ballot and how much of it sticks around.

Record Numbers, Rising Legal Pressure

The concentration is the uncomfortable part of the report. Sports contracts account for 78% of prediction market volume and 83% of open interest, which puts the sector’s growth engine squarely inside the product category US state regulators have spent the year targeting. Several states have moved to restrict sports event contracts, and operators have answered with lawsuits of their own.

Nothing in the October figures suggests traders are waiting for the courts to finish. But the numbers also make the dependency harder to argue away, because a market drawing more than three quarters of its activity from one category has very little cushion if that category gets closed off. Broadening into politics, finance and other subjects remains the clearest route to growth that does not hinge on a football schedule.

For now the trajectory points one way. Prediction market volume keeps climbing, open interest keeps setting records, and the distance between what the sector trades and what regulators will tolerate keeps getting wider. The next few months decide which of those two lines bends first.