California and 11 other states filed a lawsuit Thursday to block Paramount Global's proposed $110 billion merger with Warner Bros. Discovery, arguing the combination would harm competition in the entertainment industry and ultimately raise costs for consumers.

The states claim the deal violates antitrust law by reducing the number of major media conglomerates from six to five. They contend the merged entity would control significant portions of film production, television content distribution, and streaming services. The coalition includes attorneys general from New York, Illinois, Pennsylvania, Ohio, Massachusetts, Connecticut, Michigan, Minnesota, New Jersey, Rhode Island, Vermont, and Wisconsin.

The lawsuit targets what regulators view as excessive consolidation in media. Paramount and Warner Bros. each rank among the largest media companies globally. Paramount operates CBS, MTV Networks, and Paramount Plus streaming service. Warner Bros. Discovery controls HBO, CNN, Discovery Channel, and Max streaming platform. A combined company would command outsized influence over content creation and distribution channels that consumers depend on.

California's attorney general emphasized that the merger would reduce competitive options and enable the combined entity to charge higher prices to distributors and ultimately consumers. The states argue fewer major competitors mean less incentive to compete on price and quality.

This legal challenge adds another layer of regulatory scrutiny to the proposed deal. The Federal Trade Commission and Department of Justice have authority to review major mergers for antitrust concerns. State-level challenges amplify pressure on the deal's viability.

The entertainment sector has experienced substantial consolidation over the past two decades. Comcast acquired NBCUniversal. Disney purchased 21st Century Fox assets. Warner Bros. itself formed through Discovery's 2022 merger with WarnerMedia. These transactions fundamentally reshaped the competitive landscape, leaving fewer independent media players.

Paramount and Warner Bros. have not yet formally announced merger plans. The states' preemptive lawsuit suggests executives are exploring the combination, though neither company has confirmed discussions. Any merger would require regulatory approval before closing.

The case reflects broader antitrust enforcement priorities under the Biden administration, which has challenged tech acquisitions and healthcare consolidation. Media mergers now face similar heightened scrutiny.