Polymarket US Sues Minnesota Over Prediction Market Ban

Jonathan Rodriguez

Written by: Jonathan Rodriguez

Published: Fri Jun 05, 2026, 10:00 am ET

Read Time: 4 minutes

Polymarket US Sues Minnesota Over Prediction Market Ban

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Polymarket US, the domestic affiliate of Polymarket that operates under U.S. regulatory constraints, has filed a lawsuit against the State of Minnesota after lawmakers passed Senate File 3432. 

The law bans prediction market operations and is set to take effect on August 1, 2026. The case intensifies a broader legal clash involving US online sportsbooks, event-based trading platforms, and state gambling enforcement frameworks.

Polymarket US' lawsuit challenges Minnesota's attempt to classify prediction markets as illegal gambling. Meanwhile, regulators argue the platforms operate without adequate safeguards. The dispute now sits directly within the wider Minnesota gambling policy debate, where consumer protection concerns collide with financial market innovation.

Importantly, the federal government has already entered the conflict. The U.S. Commodity Futures Trading Commission (CFTC) has filed its own legal action challenging Minnesota's restrictions, aligning federal regulatory authority with the argument that prediction markets fall under exclusive federal oversight rather than state gambling law.

What are the Core Reasons Why Polymarket US Filed the Lawsuit Against Minnesota?

In a 42-page complaint, Polymarket US is seeking both a declaratory judgment and an immediate preliminary injunction to block enforcement of SF 3432. The company aims to stop the law before it becomes active on August 1, 2026. In addition, it argues the statute creates an urgent legal threat that cannot be ignored.

The company claims SF 3432 creates an "immediate and credible threat of imminent criminal prosecution." As a result, Polymarket US says it must either suspend access for Minnesota users or risk felony liability. The pressure is heightened by legislative intent, as state Rep. Emma Greenman and other co-authors explicitly named Polymarket and Kalshi as targets of the ban.

What SF 3432 Does to Prediction Market Operations in Minnesota

SF 3432 prohibits prediction market platforms from offering or facilitating contracts tied to real-world events within Minnesota. The law treats these instruments as gambling products, even when structured as financial derivatives under federal definitions. 

Furthermore, it authorizes enforcement actions that may result in criminal penalties for operators and affiliated service providers.

State regulators justify the ban by arguing that prediction markets can be predatory, addictive, and insufficiently transparent. They also claim these platforms lack the consumer protections typically required in regulated financial or gambling markets.

Because of this, Minnesota lawmakers moved to restrict access entirely rather than attempt partial regulation.

Key Legal Arguments Raised by Polymarket US

Polymarket US relies heavily on federal preemption under the Commodity Exchange Act. The company argues that Congress granted the Commodity Futures Trading Commission (CFTC) exclusive jurisdiction over "event contracts." Therefore, it contends that these instruments are swaps under federal law and not sports betting products. 

On this basis, Minnesota is accused of overstepping into federally controlled financial regulation.

The federal alignment strengthens this argument significantly. The CFTC's own lawsuit against Minnesota reinforces the position that states cannot unilaterally ban or restrict federally regulated derivatives markets. 

This creates a direct legal conflict between state gambling authority and federal commodities oversight.

In addition, Polymarket US raises First Amendment concerns. The company argues that SF 3432 criminalizes lawful speech, including advertising and the dissemination of forecasting data such as contract pricing. 

Specifically, it claims Minnesota is restricting protected expressive content without sufficient constitutional justification.

State Regulators and Prediction Market Platforms Face an Expanding Legal Clash

The dispute in Minnesota reflects a widening national conflict between state regulators and prediction market platforms. Several states are increasingly treating these platforms as gambling operations, citing concerns over consumer harm and regulatory gaps. At the same time, operators argue they function as financial instruments under federal supervision.

Meanwhile, litigation continues to expand across multiple fronts. Kalshi has also filed its own lawsuit against Minnesota, echoing Polymarket US in challenging SF 3432. Together, these cases suggest a coordinated industry response against state-level bans on prediction markets.

Legal challenges from private companies and the federal regulator now force courts to decide a foundational question about Minnesota's approach. The outcome may determine whether states can regulate prediction markets as gambling products or whether federal authority under the CFTC preempts those efforts entirely. 

Ultimately, the decision could reshape how US online sportsbooks-adjacent markets operate nationwide, especially as financial forecasting tools continue to overlap with gambling-style event contracts.

Jonathan Rodriguez
Jonathan Rodriguez

Jonathan is an avid basketball fan, and is often looking forward to the next upcoming NBA season when not checking players' stats during games. He also likes to keep his ears on the ground for the latest rumblings in the online casino industry.

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