The ongoing legal battle between a major ratings measurement firm and a radio broadcasting group has escalated with a new countersuit filed this week. Nielsen is accusing Cumulus Media of sharing proprietary ratings data with a competitor, Eastlan Ratings, in violation of their contract. The filing alleges that the broadcaster provided “crown jewel” data to the rival service to gain leverage during contract renewal negotiations. This countersuit follows an earlier legal move by the broadcaster, which had secured a preliminary injunction to prevent the ratings agency from cutting off services. The dispute highlights the growing tension over measurement costs and the competitive landscape for audience data in the radio industry.