Rhode Island Attorney General Launches Lawsuit Targeting Kalshi and Polymarket Event Contracts

The Rhode Island Attorney General filed suit on May 21, 2026 in Rhode Island Superior Court against prediction market operators Kalshi and Polymarket, and the complaint centers on sports-related event contracts that state officials describe as operating outside approved channels. Peter F. Neronha brought the action, which claims these contracts amount to illegal sports betting plus casino gaming under existing state statutes that confine such activities to the state lottery system. Officials assert the platforms allow users to trade contracts tied to sports outcomes, a practice they contend violates Rhode Island law by bypassing the controlled lottery framework. The filing emphasizes that only the state lottery holds authority to conduct or license these forms of wagering, and it seeks to halt the operators from continuing the activity within the state.

Timeline of the Dual Filings

Kalshi moved first on the same day by submitting a preemptive federal complaint in U.S. District Court, and that action asks the court to prevent Rhode Island from enforcing its state laws against the company. Kalshi maintains that the Commodity Futures Trading Commission already oversees its event contracts at the federal level, which would preempt conflicting state regulations. The sequence shows the operators responding to anticipated state pressure by seeking federal intervention hours before the attorney general's office made its filing public.

Both cases emerged within a narrow window on May 21, 2026, and together they illustrate the jurisdictional friction that has developed between state regulators and prediction market platforms. Rhode Island's suit focuses on enforcement under local statutes, whereas the federal filing from Kalshi highlights CFTC authority as the controlling framework for these products.

Core Allegations in the State Complaint

The Rhode Island complaint details how sports-related event contracts on the two platforms function as wagers on game results and player performances, activities that fall under the statutory definitions of sports betting and casino gaming. State law limits these offerings to the lottery's regulated system, and the attorney general's office argues that Kalshi and Polymarket lack the required authorization to offer them. The suit requests injunctive relief to stop the platforms from making such contracts available to Rhode Island residents.

According to the press release issued by the Attorney General's office, the contracts allow participants to take positions on discrete sports events in ways that mirror traditional betting markets, and this structure triggers the state's regulatory requirements. The filing does not extend to non-sports contracts, keeping the focus strictly on the sports-adjacent products that prompted the enforcement action.

Kalshi's Federal Court Strategy

Kalshi's federal complaint positions CFTC oversight as the primary regulatory regime for its event contracts, and the company seeks declaratory relief that would bar Rhode Island from pursuing state-level enforcement. The filing argues that federal commodity laws cover these products and therefore displace inconsistent state measures. Hours before the state suit became public, Kalshi had already placed the matter before a federal judge, creating parallel proceedings that address the same underlying activity from different legal angles.

Polymarket faces the state complaint alongside Kalshi, yet the federal preemptive filing came only from Kalshi; observers note this distinction leaves Polymarket's immediate defensive options centered on the Rhode Island Superior Court case. The dual-track litigation sets up a direct test of whether state authority over sports betting can coexist with or yield to federal derivatives regulation.

Regulatory Context and Legal Questions

Rhode Island statutes establish the state lottery as the exclusive operator for sports betting and casino-style gaming, and the attorney general's office cites these provisions as the basis for its claims. The lawsuit contends that event contracts tied to sports outcomes meet the legal criteria for these restricted activities, regardless of how the platforms label the products. Kalshi's response shifts the discussion to federal preemption, asserting that CFTC registration and oversight remove the contracts from state gambling prohibitions.

The cases arrive at a moment when prediction markets have expanded their sports offerings, and Rhode Island's action marks one state's effort to clarify boundaries around those products. The federal filing from Kalshi underscores the platforms' position that uniform national rules should govern such contracts instead of varying state enforcement approaches.

Conclusion

The May 21, 2026 filings in Rhode Island Superior Court and U.S. District Court place Kalshi and Polymarket at the center of a developing dispute over regulatory jurisdiction for sports-related event contracts. Rhode Island's complaint alleges violations of state laws that reserve sports betting and casino gaming for the lottery system, while Kalshi's federal action seeks protection under CFTC authority. The parallel cases will determine how state and federal oversight intersect for these platforms going forward, with the initial complaints establishing the legal positions each side intends to advance.