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Federal judge blocks Arizona from prosecuting prediction market operator Kalshi

The Kalshi app on the Google Play store on Thursday, April 9, 2026.
Chelsey Heath
/
KJZZ
The Kalshi app on the Google Play store on Thursday, April 9, 2026.

A federal judge has blocked Arizona from prosecuting the prediction market Kalshi on charges of illegal gambling and election wagering.

The Arizona Attorney’s General's Office filed criminal charges against Kalshi in March. Then the state was sued for doing so by the Trump administration.

Now, a federal judge says regulating gambling law is a rudimentary exercise of state police power. But federal law preempts local authority when it tries to regulate derivatives exchanged on markets under the watch of the Commodity Futures Trading Commission.

The Third Circuit Court of Appeals recently found that Kalshi is regulated by that commission and blocked legal action by New Jersey.

A Ninth Circuit case is pending.

Read the ruling below:

More business news from KJZZ

Matthew Casey has won Public Media Journalists Association and Edward R. Murrow awards since he joined KJZZ as a senior field correspondent in 2015.