Tribal Nations, Wisconsin Sue Prediction Markets Over Alleged Illegal Gambling

The Ho-Chunk Nation and the state of Wisconsin have filed lawsuits against online prediction market companies, including Kalshi, alleging they operate as illegal gambling enterprises. These legal actions assert that such platforms divert revenue from tribal casinos, which fund essential government services for tribal nations.

What Happened

The Ho-Chunk Nation initiated a federal lawsuit in August 2025 against Kalshi and Robinhood, categorizing these prediction markets as illegal online sports betting operations that reduce tribal revenue, according to the Green Bay Press-Gazette. Tribal nations depend on casino revenue to fund government services like healthcare, education, and infrastructure due to the absence of a direct tax base. Separately, the Wisconsin Department of Justice filed similar lawsuits in April, declaring these companies illegal in the state. Wisconsin’s actions follow similar legal challenges from Arizona, Connecticut, and Illinois.

Kalshi officials maintain that the company is governed by federal regulations and intends to defend itself against these lawsuits. A Kalshi spokesperson stated the company would vigorously defend against tribal and state lawsuits, asserting that its prediction market operations are solely under federal regulatory oversight. Tribal and state officials, however, argue that the existing federal regulations, enacted by the Trump administration, are insufficient and advocate for stricter oversight and consumer protection rules from the incoming Democratic-controlled Congress in 2027.

Key Details

• The American Gaming Association claims prediction market companies have resulted in over $1.6 billion in lost tax revenue for states from the gambling industry since December 2024 (Green Bay Press-Gazette).
• Tribal casinos in Wisconsin generate approximately $600 million annually in tax revenue and tribal revenue share payments, according to the American Gaming Association (Green Bay Press-Gazette).
• The Ho-Chunk Nation’s lawsuit, filed in August 2025, alleges online prediction markets are illegal sports betting operations (Green Bay Press-Gazette).
• The Wisconsin Department of Justice filed similar lawsuits in April, joining Arizona, Connecticut, and Illinois in legal action against prediction market companies (Green Bay Press-Gazette).
• Five tribal nations from California, Oklahoma, and Louisiana have reportedly partnered with Kalshi in operating its platforms, with Kalshi CEO Tarek Mansour stating these partnerships offer a path to new, sustainable revenue (Green Bay Press-Gazette).

Why It Matters

The lawsuits filed by tribal nations and states against prediction market companies highlight a contention over regulatory jurisdiction and revenue allocation within the gambling industry. Tribal nations rely on casino revenue for essential services, making any perceived diversion of funds a critical issue for their self-sufficiency and community welfare, as stated by Ho-Chunk Nation Vice President Lambert Cleveland. The dispute also underscores the broader challenge of regulating rapidly evolving online financial platforms that may operate in a grey area between traditional financial markets and regulated gambling.

The American Gaming Association’s reported figure of over $1.6 billion in lost state tax revenue since December 2024 emphasizes the financial impact on states with established gambling industries. The call for new congressional oversight from tribal and state officials suggests a desire for a more defined regulatory framework to address concerns about consumer protection, particularly regarding claims of platforms targeting younger individuals, as noted by Cleveland.

What’s Next

Tribal and state officials are hopeful that the new Democratic-controlled Congress, commencing in 2027, will provide increased oversight and enforce stricter consumer protection regulations for prediction markets, according to the Green Bay Press-Gazette. While the Wisconsin Legislature legalized a path toward tribally controlled online sports gambling in April, provided servers are on tribal lands, tribal officials indicate that further work is required before such offerings can commence. Kalshi has stated it will vigorously defend itself against the ongoing lawsuits, asserting its operations are governed solely by federal regulations. The outcomes of these lawsuits and potential legislative actions are expected to clarify the regulatory landscape for prediction markets and their interaction with established gambling operations.