Polymarket and Kalshi dominate the booming prediction markets, driving a 580% surge in volume to $340 million by November 2025, with sports betting leading overall.
The rapid expansion signals increased institutional interest and potential regulatory shifts, particularly with ICE’s substantial investment in Polymarket for U.S. market expansion.
Polymarket and Kalshi Claim 98% of Market Share
In 2025, Polymarket and Kalshi emerged as dominant forces in sports betting prediction markets, controlling 98% of the market’s volume. This marked a significant shift following regulatory challenges and strategic expansions that reshaped the landscape.
Polymarket, a decentralized platform, expanded globally but geofenced U.S. users due to regulatory scrutiny. Kalshi launched sports event contracts after court victories, enabling operation in states without legalized sports betting under federal approval.
Sports Betting Volume Surges 580% to $340 Million
The market’s volume rose 580%, reaching $340 million by November 2025. Sports contracts accounted for a significant portion, with Kalshi seeing high trading volume, reflecting active investor participation and interest in the burgeoning market.
Financially, the sector attracted $2.7 billion in startup funding, with Polymarket alone securing about $2.15 billion. Regulatory environments remain complex, but their role is crucial in shaping future developments and investor confidence.
Regulatory Wins Propel Kalshi’s Market Expansion
Kalshi’s late-2024 court victory against regulatory bodies preceded the sports contract launch. Polymarket’s strategic decisions post-inquiry reflect a notable parallel where firms respond to legal challenges with aggressive market expansions.
Kanalcoin experts suggest ongoing regulatory scrutiny may affect technological advancements. As one expert noted, “Market dynamics continuously evolve amid both innovative offerings and potential policy shifts.” Historical trends underscore the need for flexible strategies.
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