Federal judge lets Ho-Chunk Nation's IGRA claims against Kalshi proceed

A federal judge in the Western District of Wisconsin has allowed the Ho-Chunk Nation’s lawsuit against prediction-market operator Kalshi to move forward, ruling that the tribe has demonstrated a likelihood of success on the merits of its claims under the Indian Gaming Regulatory Act. The decision by U.S. District Judge William M. Conley is the first of its kind against a prediction-market operator and sharpens a legal question now echoing across the tribal gaming industry: do federally regulated event contracts override state-tribal gaming compacts on Indian lands?

How the dispute reached court

The Ho-Chunk Nation holds a compact with the State of Wisconsin granting it the exclusive right to operate Class III gaming — a category that includes sports betting — on its Indian lands. The tribe sued Kalshi and its trading partner Robinhood in August 2025, arguing that Kalshi’s sports event contracts function as sports wagers and are being offered to users on tribal lands without tribal authorization, in violation of the compact and federal law.

Kalshi’s central defense has been jurisdictional: the company contends its products are federally regulated event contracts traded on a designated contract market under the Commodity Exchange Act, and therefore fall under the exclusive oversight of the Commodity Futures Trading Commission rather than state or tribal gaming regulators. That argument has been the company’s consistent line in parallel disputes nationwide.

Judge Conley’s ruling did not resolve that question for good. It addressed whether the tribe’s claims could proceed and whether the tribe had shown enough likelihood of success to support preliminary relief. On both counts, the court sided with the Ho-Chunk Nation. A trial date has been set for May 24, 2027.

Why the ruling resonates beyond Wisconsin

The significance of the decision lies less in its immediate effect than in its precedential signal. Tribal nations hold Indian lands across more than twenty-five states, many with compacts that grant exclusivity over Class III gaming. If courts ultimately conclude that IGRA compacts govern what may be offered on those lands, prediction-market operators could be forced either to negotiate with each affected tribe or to geofence their products away from tribal territory.

For tribes, the case is about more than one operator. It is about whether the exclusivity they bargained for — and paid for through revenue sharing — can be eroded by a product that calls itself something other than gambling.

That exclusivity is the economic foundation of many tribal gaming operations. In exchange for the sole right to offer certain games within a state, tribes often share a percentage of revenue with state governments. The legal architecture underpinning those bargains is laid out in our explainer on prediction markets and tribal gaming exclusivity, and the Ho-Chunk ruling is the clearest judicial test yet of whether that architecture holds against event-contract platforms.

A widening front

The Wisconsin case is not isolated. In May 2026, several New Mexico tribes filed their own federal suit alleging that Kalshi’s sports markets violate IGRA and operate on tribal lands without authorization, a matter we covered in our report on the New Mexico tribes’ Kalshi litigation. Together, the cases form a coordinated legal front that could produce conflicting rulings across circuits — the kind of split that often draws eventual appellate or Supreme Court attention.

The stakes have also spilled into politics. Tribal gaming associations and prediction-market backers have both poured money into the 2026 election cycle, reflecting how high the financial and regulatory stakes have climbed. For tribes, the concern is existential: sports betting and adjacent products represent one of the few growth avenues in an industry facing slowing revenue, a dynamic explored in our analysis of capital reinvestment trends.

What to watch next

Judge Conley’s decision keeps the Ho-Chunk case alive but leaves the ultimate merits for trial. In the interim, three things bear watching. First, whether Kalshi appeals or seeks to narrow the ruling’s reach. Second, whether other district courts handling parallel suits reach consistent or conflicting conclusions. And third, whether the CFTC weighs in on the jurisdictional boundary between event contracts and gaming — a clarification that could reshape the entire dispute.

It is also worth keeping the ruling in proportion. Surviving an early-stage challenge and demonstrating a likelihood of success is a meaningful procedural victory, but it is not a final judgment that prediction-market contracts are unlawful gaming. Kalshi retains substantial arguments rooted in federal commodities law, and the company has prevailed or advanced its position in some parallel venues even as it has struggled in others. The patchwork of outcomes across jurisdictions is precisely why the industry expects this question to take years, not months, to settle.

For now, the ruling hands tribal plaintiffs their first significant courtroom validation. It does not settle whether prediction markets are gambling, but it establishes that a tribe’s IGRA-based exclusivity claims are serious enough to survive an early challenge. In a fast-moving area of law where regulators have struggled to keep pace, that is a meaningful marker. Readers tracking the regulatory backdrop can consult our Legal Guide for the statutory framework that governs these questions.