Washington Man Sues Kalshi After Losing $308,000 on Sports Bets

Key Highlights

Washington Man Seeks $580,000 & Challenges Kalshi’s Betting Platform

Bellevue resident Scott Bright says he lost more than $308,000 trading sports contracts on Kalshi. He is suing the prediction market operator, arguing that the transactions violated Washington’s restrictions on online gambling. He filed a lawsuit on September 24 in King County Superior Court and is seeking to recover far more than his reported net losses.

According to his complaint, Bright transferred $315,353.94 to Kalshi between June 17 and August 14, 2026. Those deposits came through 253 separate withdrawals from his checking account. He placed positions tied to sports, including professional baseball and tennis, and says repeated trading produced $14.4 million in transactions before his balance fell to $983.27.

Bright reports a net loss of $308,781.62 but wants $580,544.98 in restitution. His calculation treats losses from separate events individually, rather than subtracting winnings from other events. If the court rejects that request, he seeks another form of recovery that includes deposits and fees, totaling more than $405,000.

Kalshi Disputes Gambling Claims & Financial Liability

Kalshi disputes the claim that Bright was gambling. The company says customers trade federally regulated event contracts, and that federal commodities law governs those transactions. The Commodities Futures Trading Commission (CFTC) even recently sent two new proposals to the White House to strengthen its claim that these trades should be treated as contract swaps and not traditional sports bets. 

In its October 30 filing, Kalshi asked for dismissal and argued Bright made no claim of being misled about costs or potential losses. The company also says Bright’s losses went to other market participants who took the opposite side of his trades. Kalshi describes itself as an exchange that matches positions and collects fees, rather than a business that wins whenever customers lose. Bright’s complaint, however, points to a Kalshi trading affiliate that can participate in markets.

Bright alleges that the affiliate may have taken the other side of a substantial share of his positions. He acknowledges that he does not know who held those opposing trades, saying Kalshi controls that information. His complaint also alleges the platform collected about $5,589 in funding fees and $84,063 in trading fees from his activity.

Washington Gambling Restrictions & the Next Legal Steps

Bright’s lawsuit comes a few months after a Washington judge ordered Kalshi to halt betting activity on the majority of its contracts. In August, King County Judge John McHale issued restrictions on several trade categories, including sports, politics, and entertainment. The order required location controls to block those transactions in Washington, but it took effect after Bright had already transferred his money. Commodities, climate, economics, and finance contracts were excluded from restrictions.

Kalshi wants the individual lawsuit heard in federal court and has also requested a pause while the US Supreme Court considers whether to review a related dispute. The central question is whether state gambling rules can apply to contracts overseen by federal regulators, a dispute that is ongoing in more than 15 states. For Bright, the answer could determine whether his losses are recoverable under Washington law. 

Washington’s separate March 2026 lawsuit against Kalshi seeks to recover money lost by residents through the platform’s alleged illegal gambling operation. The state is pursuing that recovery under Washington’s gambling-loss recovery law.