Entercom Communications Corporation is a publicly traded American broadcasting company and radio network based in Philadelphia, Pennsylvania. Founded in 1968, it is the second largest radio company in the United States, owning 235 radio stations across 48 media markets. In November 2017, Entercom merged with CBS Radio. The transaction was structured as an exchange offer whereby owners of CBS Corporation common shares at the time of the merger could elect to exchange their shares for Entercom shares corresponding to a 72% stake in the combined company. It is not clear how many CBS shareholders retained these Entercom shares, and the present-day ViacomCBS has never held any ownership in the company.