• Arizona AG Kris Mayes filed 20 misdemeanour charges against KalshiEx LLC and Kalshi Trading LLC in Maricopa County Superior Court on 16 March, marking the first criminal prosecution of a prediction market company by any US state.

• The 20-count complaint includes 16 counts of betting and wagering (class 1 misdemeanours) and four counts of election wagering (class 2 misdemeanours), with potential fines of up to $20,000 per sports bet and $10,000 per election wager.

• The election wagering charges relate to bets accepted on the 2028 US presidential race, the 2026 Arizona gubernatorial contest, the 2026 Arizona Republican gubernatorial primary, and the 2026 Arizona secretary of state race.

• Kalshi filed its own federal lawsuit against the Arizona Department of Gaming on 12 March, five days before the criminal charges landed. A federal judge denied Kalshi's motion for a Temporary Restraining Order on the same day charges were filed, with a further hearing scheduled for 3 April.

• CFTC Chairman Mike Selig responded to the charges publicly, calling the prosecution "entirely inappropriate" and stating that the commission is "watching this closely and evaluating its options," as Kalshi has also filed separate lawsuits against Iowa and Utah in recent weeks.

Arizona Attorney General Kris Mayes filed 20 criminal misdemeanour charges against prediction market platform Kalshi on 16 March 2026, making Arizona the first US state to pursue criminal rather than civil action against a prediction market company. The charges were filed in Maricopa County Superior Court against both KalshiEx LLC and Kalshi Trading LLC.

The 20-count complaint alleges that Kalshi operated an unlicensed wagering business in violation of Arizona law and separately accepted bets on Arizona elections, which the state prohibits outright. The filing includes 16 counts of betting and wagering, classified as class 1 misdemeanours carrying fines of up to $20,000 per count, and four counts of election wagering classified as class 2 misdemeanours, each carrying fines of up to $10,000. The charges are directed at the company rather than any individual executives.

The election wagering counts centre on bets Kalshi accepted from Arizona residents on four political contests: the 2028 US presidential race, the 2026 Arizona gubernatorial race, the 2026 Arizona Republican gubernatorial primary, and the 2026 Arizona secretary of state race. Additional charges cover bets on professional and college sporting events and individual player performance propositions. One count specifically references a $1 bet on whether the SAVE Act would become law.

Arizona already has a legal, licensed sports betting market. The state's argument is that Kalshi is offering functionally identical products without any of the regulatory obligations, consumer protections, tax payments, or tribal casino agreements that licensed operators are required to meet. Mayes characterised the company's federal preemption argument as an attempt to place itself above state law, saying the state would not be deterred by Kalshi's litigation strategy.

Kalshi had anticipated the escalation. On 12 March, five days before the criminal charges were filed, the company sued the Arizona Department of Gaming in federal court, arguing that Arizona's attempts to regulate the platform intruded on the federal government's exclusive authority over derivatives trading. Federal judge Michael Liburdi denied Kalshi's motion for a Temporary Restraining Order on the same day the criminal charges landed, and issued an order requiring Kalshi to show cause why the federal case should not be paused while the criminal proceedings advance. A further hearing is scheduled for 3 April.

The federal regulator entered the fray immediately. CFTC Chairman Mike Selig, currently the only sitting commissioner on the five-seat body, posted publicly that the Arizona action was "a jurisdictional dispute and entirely inappropriate as a criminal prosecution" and confirmed the CFTC is evaluating its options. Kalshi called the charges "seriously flawed" and "paper thin," reiterating its position that as a CFTC-regulated exchange it is subject to federal rather than state jurisdiction. The company has now filed lawsuits against Arizona, Iowa, and Utah within the past three weeks, as well as facing ongoing civil litigation in Maryland, New Jersey, and Nevada, where states have sought to block its sports prediction market operations.

Donald Trump Jr., a strategic adviser to Kalshi, has a direct financial interest in the outcome of this dispute, and the Trump administration has publicly committed to defending prediction market companies in their battles with state regulators.

The move to criminal charges is a deliberate escalation, and its significance lies less in the penalty levels than in the message it sends. Misdemeanour fines of $10,000 to $20,000 per count are not existential for a company valued at $11 billion. What matters is that Arizona has reframed the dispute from a regulatory question into a criminal one, which changes the legal terrain, the reputational stakes, and the political dynamics in ways that civil enforcement cannot.

The jurisdictional clash at the heart of this case is the same one playing out across multiple courts simultaneously, but the criminal filing adds a dimension that the CFTC cannot simply override. Chairman Selig can assert exclusive federal jurisdiction in regulatory proceedings, but a state criminal prosecution under state law operates in a different lane. The federal court in Arizona will ultimately have to decide whether to allow the criminal case to proceed alongside Kalshi's own federal lawsuit, or whether to pause proceedings. That interplay will be closely watched because it will indicate whether prediction market platforms can use their CFTC-regulated status as a practical shield against state criminal law, not just civil enforcement.

For the licensed US sports betting industry, Arizona's action is exactly the ammunition operators in competitive states have been pushing regulators to deploy. Kalshi's trading volume has grown to $21.3 billion with sports contracts accounting for roughly 87% of activity. At that scale, the competition with licensed sportsbooks is real and material. The argument that Kalshi is receiving the commercial benefits of sports wagering without the fiscal and regulatory obligations of the licensed market is a strong one in states where those obligations are significant. If other attorneys general conclude that criminal charges create more legal leverage than civil enforcement, Arizona will not be the last state to go this route.