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Wisconsin Federal Judge Hands Tribes First IGRA Win Against Kalshi as Prediction-Market Legal Map Splits Open

Judge William M. Conley finds Ho-Chunk Nation has "likelihood of success" on Indian Gaming Regulatory Act claim

Category: iGaming News - USA · By Growl Games Editorial Team · Thu May 14 2026 · Updated Thu Jul 23 2026

Wisconsin Federal Judge Hands Tribes First IGRA Win Against Kalshi as Prediction-Market Legal Map Splits Open

Table of Contents

Summary

U.S. District Judge William M. Conley of the Western District of Wisconsin ruled on Monday, May 11, 2026, that the Ho-Chunk Nation's lawsuit against Kalshi may proceed and that the tribe has shown a "likelihood of success" on the merits of its Indian Gaming Regulatory Act (IGRA) claim. The decision is the first federal-court ruling to side with a tribe against the leading sports event contract platform, reversing the dominant pattern set by earlier federal challenges in California and Arizona. It opens a tribal-sovereignty front against prediction markets that runs parallel to — and now ahead of — the state attorney-general challenges and the Commodity Futures Trading Commission rulemaking on event contracts.

The Ruling

The Ho-Chunk Nation filed the case in August 2025 in the U.S. District Court for the Western District of Wisconsin, naming Kalshi Inc., KalshiEX LLC, Robinhood Markets Inc., and Robinhood Derivatives LLC as defendants. The tribe sought a preliminary injunction in December 2025 to bar the operators from offering sports event contracts to users on tribal lands while the litigation proceeds. Sixteen other tribal nations filed amicus briefs supporting the Ho-Chunk position. Judge Conley's order allowed the IGRA claim to survive Kalshi's motion to dismiss, found the tribe likely to succeed on the merits, but declined to immediately block Kalshi's contracts while the case continues. The court dismissed the tribe's false-advertising and civil RICO claims against Kalshi and Robinhood; the trial is scheduled for May 24, 2027.

The Judge's Reasoning

Judge Conley rejected Kalshi's central defenses on three points. First, he rejected the argument that gaming activity happens at Kalshi's New York headquarters or Ohio servers, concluding instead that "gaming activity happens where the bettor is physically located." Second, he rejected the argument that the 2006 Unlawful Internet Gambling Enforcement Act's exemption of CFTC-designated contract market products from the federal "bet or wager" definition immunises sports event contracts from tribal gaming compacts, writing that "just because Kalshi's conduct is not prohibited by the UIGEA does not make its offering of sports betting contracts legal anywhere, much less on Indian lands where it is expressly prohibited." Third, he noted the "absurd results" of broadly defining a "swap" under the Commodity Exchange Act to include sports event contracts. The order cited Kalshi's own marketing — Instagram advertisements describing the platform as "The First Nationwide Legal Sports Betting Platform" and stating that the platform makes "Sports Betting Legal in all 50 States on Kalshi" — and referenced a recent Arizona federal decision describing the contracts as "sports wagers and everyone who sees them knows it."

What It Reverses

The ruling reverses the dominant federal court pattern from earlier tribal challenges. In November 2025, the U.S. District Court for the Northern District of California denied a preliminary injunction sought by three California tribes against Kalshi, holding that IGRA does not apply to third-party platforms like Kalshi and that federal law expressly exempts CFTC-regulated trades. Until Monday, that ruling had been the high-water mark for Kalshi's federal-preemption-over-tribal-compacts argument. The Wisconsin decision creates a clear split between districts on whether IGRA reaches CFTC-regulated event contracts when offered on tribal lands — a split likely to drive appellate review on a faster timetable than the CFTC rulemaking process. Earlier related decisions include the Third Circuit's April 6, 2026 affirmance of a preliminary injunction in Kalshi's favour against New Jersey state enforcement, and a January 2026 Massachusetts Suffolk County Superior Court ruling preliminarily enjoining Kalshi from offering sports-related contracts to in-state users without a Massachusetts gaming licence.

The Broader Wisconsin Front

The Ho-Chunk ruling lands alongside a parallel state-level enforcement push. On April 23, 2026, Wisconsin Attorney General Josh Kaul filed three civil suits in Dane County Circuit Court naming Kalshi, Polymarket, Crypto.com (operating as Foris Dax Markets), Coinbase, and Robinhood, alleging facilitation of illegal sports betting under Wisconsin's Class I felony gambling statute. The CFTC subsequently sued Wisconsin and four other states in federal court, in partnership with the U.S. Department of Justice, seeking a declaration that state gambling laws do not apply to federally registered exchanges and a permanent injunction blocking Wisconsin's enforcement. The intra-Wisconsin developments are also shaped by Governor Tony Evers' April 9, 2026 signing of legislation removing certain electronic sports wagers from the state's "bet" definition when conducted via servers located on tribal lands and authorised by tribal compacts — a hub-and-spoke framework modelled on Florida's Seminole arrangement, which the U.S. Supreme Court declined to disturb.

Kalshi's Exposure

Sports event contracts represent roughly 90% of Kalshi's platform activity and more than $1 billion in annual revenue. The Wisconsin ruling is the first federal-court signal that a tribal-sovereignty challenge can plausibly succeed against that revenue line. Federally recognised tribes operate Class III gaming under tribal-state compacts in more than 25 states, meaning the litigation template the Ho-Chunk Nation has now established — challenging non-tribal Class III gaming offered on tribal lands via federally regulated platforms — is potentially replicable across a significant share of Kalshi's addressable user base. Bucks star Giannis Antetokounmpo owns a stake in Kalshi. Robinhood's event-contracts segment generated $147 million in Q1 2026, up 320% year-on-year. The company's $1 billion-plus sports contract revenue is now under simultaneous pressure from state AG litigation in multiple jurisdictions, the bipartisan 41-state-AG comment letter filed with the CFTC on April 30, and tribal IGRA actions.

What It Means

For Kalshi and the broader prediction-market sector, the ruling forces a structural reassessment. The federal-preemption-by-CFTC thesis on which Kalshi has built its national strategy now faces a credible counter-doctrine: that IGRA creates a meaningful constraint on whose Class III gaming is permitted on tribal lands, and that the CFTC-designated contract market framework was not designed to override tribal-state compacts negotiated under separate federal authority. For DraftKings and Flutter — both of which used Q1 earnings calls this past week to commit hundreds of millions to FanDuel Predicts and DraftKings Predictions infrastructure — the Wisconsin ruling adds tribal-jurisdiction risk to the regulatory tail they had been pricing around state-AG and CFTC outcomes alone. For state-licensed sportsbook operators and tribal gaming enterprises, the decision is the strongest indication yet that the existing licensing perimeter is being defended by courts and not only by AGs and trade associations. For offshore operators serving U.S. users, the broader signal is that the architecture of U.S. gambling jurisdiction is being contested at three levels simultaneously — federal CFTC, state, and tribal — with each level capable of producing nationally significant outcomes. The case is now on a fast track toward appellate review, and Supreme Court consideration of CEA-versus-IGRA preemption is the credible endgame.

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