U.S. Casino Groups Escalate Fights Over Prediction Market Oversight

The U.S. casino industry continues to pursue legal and regulatory actions against prediction market platforms such as Kalshi and Polymarket, entities structured as financial markets yet increasingly active in sports and event betting contracts. Observers note that these platforms have drawn scrutiny because their offerings overlap with traditional gambling activities, prompting casino associations and state officials to argue for consistent regulatory treatment across jurisdictions.

Court Ruling Clarifies State Authority

On or around August 30, the Ninth Circuit Court of Appeals issued a unanimous decision that allows states to regulate these platforms as gambling operations, a ruling that sided with Nevada officials and casino associations. Similar decisions have appeared in additional states, reinforcing the ability of regulators to apply gambling statutes rather than treating the platforms solely under financial market rules. The outcome stems from arguments that event contracts on sports and other occurrences function in practice like wagers, even when presented through order books or prediction interfaces.

Those following the case point out that the ruling addresses long-standing questions about whether platforms can operate nationwide without state-level gambling licenses. Data from recent months shows trading volumes have risen sharply, with sports-related contracts accounting for billions in activity, a trend that has heightened concerns among licensed casino operators about revenue shifts and tax collections.

Industry Concerns Over Revenue and Taxation

Casino representatives have highlighted potential losses in both direct betting revenue and associated tax payments when prediction platforms handle event contracts outside traditional regulatory frameworks. Figures from industry tracking indicate that sports-related activity on these platforms has grown substantially, creating parallel markets that compete for participant attention and capital. Regulators in multiple states have responded by examining how existing gambling laws apply to these new structures, leading to enforcement actions and calls for clearer federal guidance.

The Ninth Circuit decision builds on prior legal interpretations that distinguish between financial derivatives and contracts tied directly to event outcomes. Court records show that states retain authority to require compliance with local licensing and oversight rules when platforms facilitate sports or event-based trading. This approach aligns with efforts to maintain consistent standards for consumer protection and tax reporting across all forms of betting activity.

Broader Regulatory Developments

Additional states have issued comparable rulings following the Ninth Circuit precedent, extending oversight to platforms that offer contracts on elections, sports results, and other events. These decisions emphasize that the economic substance of the contracts matters more than the technological or market structure used to execute trades. Industry groups continue to monitor filings and hearings as platforms seek to maintain operations under existing federal designations while states assert their regulatory reach.

Trading data reveals that billions in volume have moved through sports-linked contracts in recent months, underscoring the scale of activity now under review. State regulators have cited these volumes when justifying new enforcement priorities and when evaluating applications for gambling licenses from prediction market operators. The process involves detailed reviews of contract terms, settlement mechanisms, and participant eligibility to determine whether operations fall under gambling statutes.

Next Steps in Ongoing Litigation

Further proceedings are expected as platforms and industry associations respond to the recent rulings. Legal teams on both sides have signaled plans to address remaining questions about contract classification and interstate commerce implications. State officials continue to coordinate through regulatory associations to share information on enforcement strategies and licensing requirements.

The surge in activity has prompted renewed discussions among lawmakers about potential legislation that could clarify boundaries between financial markets and gambling activities. Current cases focus on specific platforms yet carry implications for any entity offering event-based contracts that resemble traditional wagers. Observers expect additional court filings and regulatory guidance in the coming months as the landscape evolves.

Conclusion

The August 30 Ninth Circuit ruling and subsequent state actions mark a significant development in how prediction market platforms are treated under U.S. law. With trading volumes reaching billions in sports-related contracts, the casino industry and regulators have intensified efforts to apply consistent gambling oversight. The outcomes of these cases will shape operational requirements for platforms and influence tax and revenue frameworks across affected states.