Utah targets Susquehanna affiliates in Kalshi sports betting suit

Derek Brown filed his complaint in Utah's Third District Court on October 20, and the headline number is 32,000 — verified accounts belonging to Utah residents who kept trading on Kalshi after a federal judge had already told the platform it had no preemption argument to stand on.

The lawsuit names KalshiEx LLC, but the more consequential defendants are the two trading firms affiliated with Susquehanna International Group. Utah's theory is specific: market makers didn't passively facilitate the contracts, they actively sustained them. Without that liquidity, the argument goes, the platform couldn't have continued operating at the scale it did after the August ruling. That is a different legal claim than what states have been filing against Kalshi directly, and it opens a flank the industry hasn't had to defend before.

The economics of the complaint are worth reading carefully. Platform fees tied to Utah residents are estimated between $30.6 million and $61.2 million. The state wants all of it back — restitution for residents who lost money, disgorgement of profits the companies earned from conduct the state says was unlawful from the moment the August ruling came down. Utah isn't asking for a line in the sand. It's asking for the money that crossed it.

The timeline matters here. Kalshi went to federal court in February 2026, trying to establish preemption before enforcement began. The federal court ruled against them in August. The 10th Circuit denied the injunction pending appeal in September. The state filed in its own court in October. Each step has been a door closing, and Kalshi has continued operating through each one. That sequence is exactly what Utah is now arguing constitutes the harm.

I've watched regulators file cases like this before, and the ones that get settled fast are the ones where the defendant has a clean preemption argument. Kalshi doesn't — not in the 10th Circuit's jurisdiction, not on sports contracts. The inclusion of the Susquehanna-affiliated firms changes the settlement calculus considerably, because market makers don't carry regulatory risk as a line item. The moment this becomes a question of whether liquidity provision in a disputed market creates liability, those firms have institutional reasons to resolve it quietly and quickly.

Utah's gambling prohibition is constitutional, not statutory — it predates the state's admission to the union and was clarified by the 2026 legislature to cover proposition bets explicitly. That is not a jurisdiction where a creative federal argument finds sympathy. The $61 million ceiling on platform fees is real money, and the disgorgement claim means Kalshi and its market makers are not arguing about whether they owe something, but how much.