Polymarket sues Massachusetts over threatened state enforcement
Polymarket filed a federal lawsuit on 9 February 2026 against Massachusetts Attorney General Andrea Joy Campbell, seeking to block what it describes as imminent state enforcement against its prediction market. The company argues that federal oversight applies to its event contracts; the filing follows a Massachusetts court’s refusal to pause an injunction against Kalshi’s sports contracts.
The lawsuit may clarify whether Massachusetts can enforce state gambling laws against Polymarket’s event contracts.