Wisconsin Sues Kalshi, Robinhood, Polymarket — Then the CFTC Sues Wisconsin Back
Archived report: written in May 2026 about Wisconsin's lawsuit and the CFTC's response; prices and details are as of then, not live.
Legal information, not legal advice. If you have concerns about your trading activity, consult a qualified attorney.
Quick Answer
- Wisconsin AG Josh Kaul sued Kalshi, Robinhood, Polymarket, Coinbase, and Crypto.com on April 23, 2026.
- The CFTC and DOJ counter-sued Wisconsin on April 28 — the fifth state the agency has taken to court over prediction markets.
- Markets remain live in Wisconsin while the cases proceed; no platform has voluntarily geo-blocked the state.
- The federal preemption fight is now active in five states and is widely expected to reach the Supreme Court by 2027–2028.
On April 23, 2026, Wisconsin Attorney General Josh Kaul filed suit against five of the largest prediction market platforms — Kalshi, Robinhood, Polymarket, Coinbase, and Crypto.com — alleging they operate illegal sports betting operations in the state. Five days later, on April 28, the Commodity Futures Trading Commission↗ and the Department of Justice fired back, suing Wisconsin in the US District Court for the Eastern District of Wisconsin to block the state's enforcement actions.
Wisconsin is now the fifth state the CFTC has sued over prediction-market crackdowns, joining New Jersey, Maryland, Massachusetts, and Nevada in active federal litigation.
What Wisconsin Alleges
The state's complaint argues that contracts on real-world events — particularly single-game sports outcomes like the Super Bowl winner — are functionally indistinguishable from sports betting and must be licensed under Wisconsin gaming law. The filing names contracts on the 2028 presidential election, NFL playoff results, and weekly NBA games as examples of "gambling disguised as derivatives trading."
Wisconsin is asking the court to:
- Order the platforms to stop offering event contracts to Wisconsin residents
- Impose civil penalties under the state's consumer-protection statute
- Require disgorgement of revenue earned from Wisconsin users
What the CFTC's Counter-Suit Says
The federal complaint, filed jointly with the DOJ, argues that Wisconsin is preempted by federal commodities law. Event contracts traded on a CFTC-registered Designated Contract Market (DCM) are derivatives — not gambling — and only the CFTC has jurisdiction to regulate them. The agency points to 7 U.S.C. § 2(a)(1)(A), which gives it exclusive authority over futures and swaps trading on registered exchanges.
This is the same argument the CFTC has used in New Jersey, where a federal appeals court sided with Kalshi in early 2026. Maryland and Massachusetts ruled the other way, creating a circuit split.
Why This Matters for Traders
- Markets stay open during litigation. No platform has voluntarily blocked Wisconsin, and courts have so far refused to issue preliminary injunctions while the federal preemption question is unresolved.
- The Wisconsin case accelerates the SCOTUS timeline. With five active state suits and a clear circuit split, prediction-market lawyers expect the Supreme Court to grant cert in the 2026–2027 term.
- State sports contracts remain the flashpoint. Non-sports event contracts (politics, macro, weather) have not been challenged. The legal risk is concentrated in sports, especially single-game outcomes.
What to Watch Next
- Preliminary injunction hearing in Wisconsin. Expected within 30–45 days of the CFTC filing. Whichever side wins sets the tone for the next round of state actions.
- Other state AGs. Sources at the National Association of Attorneys General have signaled at least three more states are preparing similar filings if Wisconsin's case advances.
- CFTC commissioner vacancies. Four of five CFTC seats are currently vacant. A re-staffed commission could change litigation strategy mid-stream.
Sources
- Wisconsin Department of Justice complaint, April 23, 2026 (WBAY, WPR coverage)
- CFTC v. Wisconsin, complaint filed April 28, 2026 (Bloomberg Law)
- AP / Fox 47 reporting on federal counter-suit, April 29, 2026
What This Doesn't Change
CFTC-registered platforms remain federally regulated pending court rulings; each lists only a few excluded states. If you trade in Wisconsin (or any contested state), nothing changes today — but stay alert for sudden geo-blocking if a court issues an injunction. We will update this article as the litigation progresses.
See our full state-by-state legality tracker →
Related articles
- The legal status of prediction markets in the US is complex. Here is exactly where things stand in 2026 and what it means for traders.
- Kalshi's sports contract fight is heading toward Supreme Court review. Here is what it means for traders on every platform.
- Sports contracts are restricted in 9 states due to legal challenges. Here is the current list and what you can still trade from those states.