Ho-Chunk Nation’s IGRA Case Against Kalshi Survives Federal Court — The Wisconsin Ruling That Could Reshape Prediction Markets

A federal judge in the Western District of Wisconsin delivered a significant blow to Kalshi on Monday, ruling that the Ho-Chunk Nation’s lawsuit under the Indian Gaming Regulatory Act can proceed and, more critically, writing that the tribe has demonstrated a likelihood of success on the merits of its claims. The ruling from US District Judge William M. Conley marks the first of its kind against a prediction market operator and raises serious questions about where Kalshi’s sports event contracts can legally be offered — and who gets to decide.

The Legal Framework: What IGRA Says and Why It Applies

The Indian Gaming Regulatory Act of 1988 established a framework under which federally recognized tribes have the exclusive right to regulate Class III gaming on their lands, pursuant to tribal-state gaming compacts. The Ho-Chunk Nation holds a compact with the State of Wisconsin that grants it exclusive rights to operate Class III gaming — which includes sports betting — on its Indian lands. The tribe sued Kalshi and its partner Robinhood promo code in August 2025, arguing that Kalshi’s sports event contracts constitute sports gambling as defined under IGRA, the Nation’s compact, and its gaming ordinance, and that Kalshi is offering those products to users on tribal lands without tribal authorization.

Kalshi’s central defense has been that its products are federally regulated event contracts traded on a designated contract market under the Commodity Exchange Act — and that CFTC-regulated instruments are categorically exempt from tribal gaming rules. The company argued the tribe was attempting to relabel legitimate financial contracts as sports betting to manufacture a legal claim. Kalshi also argued the Ho-Chunk Nation could not demonstrate concrete harm because the tribe does not currently operate a sports betting platform itself.

Judge Conley rejected enough of that framing to allow the case to proceed and found that the tribe had shown a likelihood of success. An earlier stage of the case involved a temporary restraining order request from the tribe, which remains pending, and sixteen other tribal nations filed amicus briefs backing the tribe’s position — a sign of how broadly the tribal gaming community views this case as a precedent-setting fight.

What the Ruling Means for Kalshi’s Business Model

Kalshi’s sports event contracts — which allow users to take yes-or-no positions on the outcomes of sporting events — have been one of its fastest-growing product categories since the CFTC granted approval to offer them in 2024. The company has argued these products are fundamentally different from traditional sports betting because they are exchange-traded instruments subject to federal commodities regulation, not state-by-state gambling licensing. That argument is now being tested at a level of specificity courts have not previously addressed: whether a CFTC-approved product can be offered on tribal land over a tribe’s objection under IGRA.

If the tribe ultimately prevails and secures a permanent injunction blocking Kalshi’s sports event contracts on Ho-Chunk lands, the impact is not limited to a single Wisconsin tribe. Tribal nations hold Indian lands across more than 25 states where prediction markets like Kalshi operate or plan to operate. A precedent establishing that IGRA compacts control what can be offered on those lands — even for CFTC-regulated products — would require Kalshi and any competitor in the space to negotiate directly with each affected tribe or block access geofenced to tribal lands. Either outcome is operationally complex and commercially significant. A trial date has been set for May 24, 2027.

The Broader Stakes for Prediction Markets

The tribal gaming industry has been one of the most organized and well-resourced opponents of Kalshi’s expansion into sports event contracts. The tribes see prediction markets not as a new asset class but as a competing sports gambling product that threatens the exclusive compact rights they have held and defended for decades. The amicus brief filed by sixteen tribal nations in this case is not an accident — it reflects a coordinated strategy to use IGRA’s enforcement provisions to establish limits on what prediction market operators can do on Indian lands without tribal consent.

For Kalshi, the risk is not just legal — it is structural. The company’s pitch to regulators and investors has been premised on the idea that federal CFTC oversight supersedes state and tribal gambling frameworks. A federal court finding that IGRA creates a meaningful constraint on that model forces a reassessment of the addressable market and the compliance infrastructure required to operate nationally. Operators and sports betting industry observers watching this space should track the trial schedule closely. This case will likely produce the clearest judicial statement yet on whether prediction markets and tribal gaming compacts can coexist — or whether they are on a collision course that only Congress can resolve.