CFTC Sues Wisconsin as Federal-State Prediction Market War Reaches Five States

The federal government's legal campaign to establish exclusive authority over prediction markets reached a new milestone Tuesday, when the Commodity Futures Trading Commission filed suit against Wisconsin — the fifth state to face a federal lawsuit over its attempt to treat event contracts as illegal gambling.

The CFTC filed the complaint in the Eastern District of Wisconsin just four days after the state's own attorney general launched civil suits against five of the most popular prediction market platforms in the country. The agency's message was blunt: states don't have the authority to do this, and they'll be taken to federal court if they try.

"States cannot circumvent the clear directive of Congress," CFTC Chairman Michael S. Selig said in a statement accompanying the filing. "Our message to Wisconsin is the same as to New York, Arizona, and others: if you interfere with the operation of federal law in regulating financial markets, we will sue you."

The Wisconsin filing marks the latest in a series of escalating legal confrontations between federal regulators and state authorities that has reshaped the regulatory landscape for prediction markets since early April.

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Wisconsin Fired First: The State's Case Against Five Platforms

Wisconsin Attorney General Josh Kaul launched the opening salvo on April 23, filing three separate civil complaints in Dane County against a collection of platforms that includes virtually every major name in the US prediction market industry.

The first complaint targeted Kalshi, alongside distribution partners Robinhood and Coinbase — both of which route their event contract orders through Kalshi's federally regulated exchange. The second went after Polymarket and related entities. The third targeted Crypto.com and its derivatives subsidiary, Crypto.com Derivatives North America (CDNA).

All three complaints rested on the same legal theory: that event contracts — financial instruments tied to the outcome of real-world events — constitute bets under Wisconsin's gambling statutes, regardless of how the platforms label them or what federal regulator oversees them.

The state cited the platforms' own marketing language against them. Kalshi's Instagram ads had described the company as "The First Nationwide Legal Sports Betting Platform." Polymarket's materials described itself as "a platform where people can bet on the outcome of future events." Wisconsin prosecutors argued that structure is the issue, not branding: users put money at risk on an uncertain outcome and receive a fixed payout if correct. That's a bet under state law.

"Thinly disguising unlawful conduct doesn't make it lawful," Attorney General Kaul said in a statement announcing the complaints. "These companies' alleged facilitation of sports betting in Wisconsin should be shut down."

The complaints sought no monetary damages — only injunctions blocking the platforms from offering sports-related event contracts to Wisconsin residents.

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The CFTC Counter-Punch: Federal Law Says States Must Stand Down

The CFTC's response came five days later, and it mirrors the same legal structure the agency has deployed in every other state lawsuit filed since April 2.

Congress assigned exclusive jurisdiction over commodity derivatives — including event contracts traded on designated contract markets (DCMs) — to the CFTC decades ago under the Commodity Exchange Act. The CFTC's argument is simple: when Congress grants an agency exclusive federal jurisdiction over a market, state law cannot reach into that market.

All five of the platforms Wisconsin sued hold federal regulatory status. Kalshi, Robinhood, and Coinbase operate under Kalshi's CFTC-registered DCM license. Polymarket's US operations run through QCX LLC, which holds its own CFTC DCM designation (dated July 9, 2025). Crypto.com's derivatives arm operates through CDNA, also a CFTC-registered exchange.

The CFTC's complaint in the Eastern District of Wisconsin seeks two things: a declaratory judgment that federal law grants it exclusive authority to regulate event contracts, and a permanent injunction blocking Wisconsin from enforcing its gambling laws against any CFTC-registered platform. The agency argues that continued state enforcement would "interfere with the operation of federal law" and make it impossible for exchanges to comply with both state and federal requirements simultaneously — particularly given federal rules requiring equal, nationwide access to these markets.

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The Legal Argument: Why Federal Preemption Matters

At the heart of the CFTC's case is the Supremacy Clause of the US Constitution, which establishes that federal law is the "supreme Law of the Land" when Congress acts within its authority. The CFTC argues Congress acted clearly when it passed the Commodity Exchange Act and its successors, granting the CFTC exclusive jurisdiction over commodity derivatives.

The specific legal mechanism is the "conflict preemption" doctrine: state law is preempted when compliance with both the state and federal requirement is a physical impossibility, or when the state law "stands as an obstacle to the accomplishment and execution of the full purposes and objectives of Congress."

The CFTC's April 2, 2026 filing against Arizona, Connecticut, and Illinois (PR 9206-26) laid out the foundational argument: "Congress long ago decided that a national framework for commodity derivatives markets was preferable to a fragmented patchwork of state regulations." The Wisconsin suit (PR 9220-26) restates the same position.

The Third Circuit Court of Appeals handed the federal preemption argument its biggest judicial win on April 8, ruling that New Jersey could not enforce its gambling laws against Kalshi. That ruling — while binding only in the Third Circuit (covering NJ, PA, DE) — carries significant persuasive weight in other federal courts now deciding the same question. The CFTC itself filed an amicus brief supporting this position in the Ninth Circuit (PR 9183-26) and in the Massachusetts Supreme Judicial Court (PR 9219-26).

In Arizona, the federal preemption argument produced its most concrete result so far: on April 10, US District Judge Michael Liburdi granted a Temporary Restraining Order (PR 9211-26) blocking Arizona from continuing its criminal prosecution against a CFTC-regulated platform — the first federal court to halt state-level criminal enforcement against a prediction market exchange.

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The Scorecard: Five States, One Federal Counter-Campaign

The CFTC's campaign against state enforcement now spans five states in less than 30 days:

Date	Action	PR #	Court
April 2, 2026	CFTC sues Arizona, Connecticut, Illinois	9206-26	D. Ariz., D. Conn., N.D. Ill.
April 9, 2026	CFTC files TRO motion in Arizona	9208-26	D. Ariz.
April 10, 2026	Federal judge grants TRO, blocks AZ criminal prosecution	9211-26	D. Ariz.
April 24, 2026	CFTC sues New York	9218-26	S.D.N.Y.
April 24, 2026	CFTC files amicus brief in Mass SJC	9219-26	Mass. SJC
April 28, 2026	CFTC sues Wisconsin	9220-26	E.D. Wis.

The Arizona result is the clearest early indicator of where federal courts may be heading. Judge Liburdi's TRO determination — that the CFTC is likely to succeed on the merits of its preemption argument — was a significant early signal that the federal framework may hold up under judicial scrutiny.

On the state side, the picture is more mixed. Courts in Massachusetts, Maryland, Nevada, and Ohio have each issued rulings supporting state authority to regulate prediction markets under their gambling laws. The Massachusetts Supreme Judicial Court is expected to hear further arguments in the summer of 2026, with the 38-attorney-general amicus brief filed last week putting significant weight on the state side of the scale.

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What Happens Next in Wisconsin's Federal Court

The Eastern District of Wisconsin will now handle both the CFTC's federal lawsuit and the platforms' own removal petitions — Polymarket, Kalshi, Crypto.com, Robinhood, and Coinbase all moved to remove the state Dane County complaints to federal court shortly after being served.

This means the Wisconsin federal courthouse is now the site of two overlapping legal battles: the CFTC's affirmative lawsuit seeking to block Wisconsin enforcement, and the platforms' separate defense against Wisconsin's original state complaints (now removed to federal court).

The CFTC's TRO experience in Arizona suggests the agency will likely seek preliminary injunctive relief in Wisconsin quickly. If it obtains a TRO similar to the one Judge Liburdi granted in Arizona, it would effectively freeze Wisconsin's enforcement campaign while the merits are litigated — potentially for months or years.

Wisconsin's AG Kaul has shown no sign of backing down. The state's complaint against Kalshi cited the AG's office's own statement that the platforms are engaged in "sports betting in Wisconsin" that "should be shut down." The legal brief filed in Wisconsin emphasized that the CFTC's preemption arguments had already been rejected by courts in Massachusetts, Maryland, and Nevada.

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What This Means for Prediction Market Users in Wisconsin

For users in Wisconsin, the immediate practical question is whether the platforms will restrict access during the litigation.

Following the pattern established in other contested states, platforms have generally maintained service while federal litigation proceeds, particularly where state enforcement is paused by court order. In Arizona, Kalshi restored full access for Arizona users shortly after the TRO was granted. A similar dynamic is likely in Wisconsin if the CFTC obtains preliminary injunctive relief.

If Wisconsin courts side with the state before a federal injunction is issued, platforms may temporarily restrict Wisconsin users' access to sports-related markets — the specific category targeted by the state's complaints. Non-sports markets (weather, economics, politics, entertainment) were not the focus of Wisconsin's complaints.

It's worth noting: the platforms targeted by Wisconsin's suits are all federally regulated exchanges. Kalshi holds a CFTC DCM license. Polymarket US operates through QCX LLC d/b/a Polymarket US, a separately CFTC-licensed DCM. Crypto.com's US derivatives arm (CDNA) is also CFTC-registered. These aren't unregulated offshore platforms — they operate under the same federal oversight framework as commodity futures exchanges.

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FAQ

Why did the CFTC sue Wisconsin instead of just defending the platforms? The CFTC chose to sue Wisconsin directly to establish federal preemption on its own terms, in federal court, rather than waiting for Wisconsin courts to rule. This lets the agency shape the legal framing of the preemption argument without relying on the platforms' own defense strategies.

Is the CFTC suing all 50 states? No. The CFTC has sued five states where active enforcement actions were filed against prediction market platforms: Arizona, Connecticut, Illinois, New York, and Wisconsin. It has also filed amicus briefs in the Ninth Circuit and Massachusetts Supreme Judicial Court. States that haven't taken enforcement action against platforms have not been targeted.

What's the difference between Wisconsin suing the platforms and the CFTC suing Wisconsin? Wisconsin's lawsuits assert that the platforms violated state gambling law. The CFTC's lawsuit asserts that Wisconsin has no authority to make that claim because federal law gives the CFTC exclusive jurisdiction over these markets. The CFTC is not defending the platforms in Wisconsin's cases — it's challenging Wisconsin's right to bring those cases at all.

What did the Third Circuit rule, and why does it matter here? On April 8, the Third Circuit Court of Appeals ruled that New Jersey could not enforce its gambling laws against Kalshi, accepting the federal preemption argument. While that ruling only binds courts in the Third Circuit (NJ, PA, DE), it provides persuasive precedent for courts in other circuits — including the Seventh Circuit, which covers Wisconsin — that are now confronting the same question.

Could this reach the Supreme Court? Likely yes, eventually. The federal-state conflict over prediction markets has produced conflicting rulings in state and federal courts across the country. That circuit split — combined with the enormous economic stakes — makes this a strong candidate for Supreme Court review, potentially in the 2026-2027 term if cases progress quickly.

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Conclusion

The CFTC's lawsuit against Wisconsin isn't just another filing in a growing stack of regulatory litigation — it's the clearest expression yet of the agency's strategy for this legal war. Rather than waiting for states to litigate their cases through to resolution, the CFTC is proactively suing each state that takes enforcement action, forcing the preemption question into federal court on its own timeline.

Five states in 26 days. One federal court TRO already granted. The Third Circuit already on the board for federal preemption.

The question now is whether the Eastern District of Wisconsin will follow Arizona's lead, or become the next state where courts find that federally regulated derivatives are still subject to state gambling laws. The answer will shape whether prediction markets operate under a single national rulebook or a patchwork of 50 different regulatory environments.

Explore all active state and federal prediction market litigation at PredictionMarkets.US and track upcoming rulings with our prediction market regulation guide.

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Sources & Verification

• CFTC PR 9220-26 (CFTC Sues Wisconsin to Reaffirm its Exclusive Jurisdiction Over Prediction Markets): CFTC.gov — verified April 28, 2026
• CFTC PR 9206-26 (CFTC Sues Arizona, Connecticut, Illinois, April 2): CFTC.gov — verified April 28, 2026
• CFTC PR 9218-26 (CFTC Sues New York, April 24): CFTC.gov — verified April 28, 2026
• CFTC PR 9211-26 (TRO blocks AZ criminal prosecution, April 10): CFTC.gov — verified April 28, 2026
• CFTC PR 9219-26 (CFTC amicus brief, Mass SJC, April 24): CFTC.gov — verified April 28, 2026
• "CFTC sues Wisconsin over prediction market regulations": The Hill, April 28, 2026 — Selig quote confirmed — verified April 28, 2026
• QCX LLC DCM designation (July 9, 2025): CFTC press release on QCX LLC DCM designation, July 9, 2025 — verified