Points of Focus

• A Washington judge backs the state’s case against Kalshi’s prediction markets.
• The court rejects the early federal preemption defense in the gambling dispute.
• The ruling intensifies nationwide legal uncertainty for prediction market platforms.

A Washington state judge has ruled that prediction market platform Kalshi is likely operating in violation of the state’s gambling laws, granting a preliminary injunction that could force the company to stop offering its event contracts to Washington residents while the case moves forward.

King County Superior Court Judge John McHale concluded that Washington is likely to succeed in proving Kalshi violated both the Washington Gambling Act and the state’s Consumer Protection Act. The court found that allowing the platform to continue operating during the litigation could cause substantial consumer harm and that the public interest favored granting the injunction. The final order is expected to be entered on Aug. 5 after both parties submit additional briefings.

We’re holding Kalshi accountable for their illegal gambling operation. On Monday, a judge in King County Superior Court issued an order which says that Kalshi’s activities are likely illegal and they need to take action to stop harming Washington consumers. Our next step will be… pic.twitter.com/UXbm05cDgS

— Attorney General Nick Brown (@AGOWA) July 21, 2026

The ruling marks another setback for Kalshi as it continues to defend its prediction market business model against challenges from multiple US states.

Washington court backs state’s gambling claims

Washington Attorney General Nick Brown filed the lawsuit, arguing that Kalshi has been offering what are effectively gambling products without obtaining the licenses required under state law.

According to the Attorney General’s office, Kalshi allowed Washington residents to trade contracts tied to sports, elections, and other real-world events that the state considers illegal gambling. Brown has argued that simply labeling the products as financial contracts does not exempt them from Washington’s gambling statutes.

In granting the preliminary injunction, Judge McHale determined that the state had presented sufficient evidence showing it is likely to prevail at trial. The court also found that consumers could continue to suffer harm if Kalshi remained operational while the legal dispute continues.

Brown welcomed the ruling, saying the state will continue pursuing measures to halt Kalshi’s activities and seek restitution for Washington residents who allegedly lost money through the platform.

Federal oversight clashes with state gambling laws

Kalshi maintains that its event contracts are federally regulated derivatives overseen by the Commodity Futures Trading Commission (CFTC).

The company argues that because it operates as a CFTC-regulated designated contract market, federal commodities law preempts state gambling regulation. Kalshi has relied on this argument in legal disputes across several states, contending that individual states cannot prohibit products already permitted under federal law.

Washington challenged that position, arguing that federal regulation does not prevent states from enforcing their own gambling and consumer protection laws when companies offer products to local residents.

Judge McHale rejected Kalshi’s request to avoid state enforcement at this stage of the proceedings, finding Washington’s legal arguments sufficiently persuasive to justify preliminary relief while the broader case proceeds.

Kalshi has not indicated that it will cease defending its position and is expected to continue challenging state-level restrictions.

Ruling adds to Kalshi’s growing legal challenges

The Washington decision is the latest in a series of lawsuits testing the legal status of prediction markets throughout the United States.

States including Massachusetts, Michigan, Nevada, Arizona, and New York have all taken action against Kalshi, arguing its sports and event contracts constitute illegal gambling under their respective laws. Meanwhile, federal courts have also issued rulings favorable to Kalshi in certain jurisdictions, creating an increasingly fragmented regulatory landscape.

The conflicting decisions have left the industry without a clear national precedent on whether federally regulated event contracts are immune from state gambling enforcement.

The case carries broader implications for the prediction market industry, which has expanded rapidly over the past two years as platforms introduced contracts tied to elections, sporting events, economic indicators, and geopolitical developments. Growing trading volumes have drawn increased attention from regulators concerned about consumer protection and the overlap between derivatives markets and gambling laws.

For Kalshi, the Washington ruling represents another significant legal hurdle. For the wider prediction market sector, it reinforces that state regulators remain willing to challenge federally regulated platforms when they believe local gambling laws are being circumvented.

The final injunction, expected in early August, could influence similar disputes elsewhere as courts continue defining the boundaries between federal commodities regulation and state gambling authority.