The Justice Department plans to file an antitrust lawsuit against Live Nation, the parent company of Ticketmaster, as soon as Thursday, according to four people familiar with the matter who spoke on the condition of anonymity to describe the case before it becomes public.

The lawsuit is expected to allege that the entertainment conglomerate leveraged its sprawling footprint — as a concert promoter, ticket seller and venue owner — to box out rivals in ways that lessened consumer choice and resulted in rising prices for consumers, the sources said.