Massachusetts Attorney General Andrea Joy Campbell released the following statement after securing a preliminary injunction in her lawsuit against KalshiEX LLC (Kalshi), a self-described online “prediction market”. The court’s order will allow a preliminary injunction to take effect, prohibiting Kalshi from accepting online sports wagers and related events contracts from Massachusetts customers until the company follows the state laws that govern sports gaming, including licensure by the Massachusetts Gaming Commission (MGC). The order also denied Kalshi’s motion to dismiss the AGO’s lawsuit filed against them in September 2025.

“The Court has made clear that any company that wants to be in the sports gaming business in Massachusetts must play by our rules – no exceptions. Today’s victory marks a major step toward fortifying Massachusetts’ gambling laws and mitigating the significant public health consequences that come with unregulated gambling, “ said AG Campbell.

In September, AG Campbell filed a lawsuit against Kalshi, alleging that the company uses an online “exchange” to offer sports wagering under the guise of “event contracts,” which allow bettors to place wagers connected to sports, such as the likelihood of a certain team winning a game or a certain player scoring a particular number of points. Kalshi’s platform offers “event contracts” on sporting events, including moneyline contracts, point spread contracts, and over-under contracts. These “event contracts” closely resemble sports wagers offered by licensed operators. The platform actively promotes its sports wagering offerings on television, social media, and online. Kalshi has neither applied for nor received a Massachusetts sports wagering license from the MGC, as required by law.

This matter is representative of AG Campbell’s ongoing efforts to combat the public health harms associated with sports betting and gambling, especially among young people. In June 2025, AG Campbell issued cease-and-desist letters to two online gaming operators for offering online gambling and betting products without obtaining a license. In March of 2024, AG Campbell announced the formation of the Youth Sports Betting Safety Coalition, a private-public partnership to raise awareness about the laws and risks surrounding youth online sports gambling.