Prediction Markets Hit Record $4.13B Daily Volume in October Surge

Prediction markets reached an all-time high in October, recording average daily volume of $4.13 billion across yes-or-no exchanges, according to analysis by Jefferies. The 55% month-over-month increase from September marks the strongest performance since these platforms began tracking aggregate volume data. Open interest also climbed substantially, rising 45% to $3.27 billion, signaling deepening market participation and trader confidence.

The October surge coincided with the return of major sporting events. The NFL regular season, college football campaigns, and the start of the 2026-27 NBA season provided substantial liquidity across sports prediction contracts. Sports markets generated nearly $3 billion in average daily volume, representing 78% of total market activity. This concentration underscores the sector's continued dependence on athletic events to drive trading engagement. However, the proportion of open interest allocated to sports contracts expanded to 83% from 73% in September, suggesting traders are holding longer-term positions in sports outcomes.

Polymarket maintained its dominant market position, commanding 17% of tracked volume with average daily trading reaching $655 million in October, a 50% monthly increase and 395% year-over-year gain. The platform's sustained leadership reflects both brand recognition and accumulated liquidity, though its relative market share remained flat compared to September. Other tracked platforms collectively achieved $309 million in average daily volume, representing a 56% monthly jump and 710% increase versus October 2025, though their combined market share held at approximately 7%.

Rothera, the prediction market platform launched in June as a joint venture between Robinhood Markets and Susquehanna International Group, also showed growth momentum. Its average daily volume rose 55% month-over-month to $49 million, capturing 1.2% of industry volume, though slightly down from 1.5% in September. This trajectory suggests the newer entrant is gaining traction despite market concentration among established players.

Non-sports prediction markets also demonstrated significant expansion, with average daily volume climbing 55% to $843 million. Political contracts drove much of this activity, particularly surrounding the US midterm election cycle. With Election Day occurring November 4, 2026, traders deployed capital across political outcome markets before the conclusion of betting windows. Analysts anticipate attention may subsequently shift toward cryptocurrency and financial market prediction contracts, categories that remain underdeveloped relative to sports.

The data reveals an important dynamic in market maturation. While sports remain the dominant use case, the balanced 55% growth rate across both sports and non-sports categories suggests the sector is gradually diversifying its revenue and participation bases. For the industry to achieve sustainable long-term expansion beyond seasonal sporting calendars, operators must continue cultivating engagement in political, financial, and other outcome categories.

From a CasinoAdvisor perspective, the October results underscore prediction markets' growing relevance within the broader gambling ecosystem. The sector's explosive growth trajectory and expanding operator base reflect consumer appetite for event-based wagering products that extend beyond traditional sportsbook offerings. However, the concentration of volume among leading platforms warrants monitoring, particularly as regulatory frameworks across US jurisdictions continue evolving.