This article aims to study how private European radio is becoming commercially international through the expansion of radio brands beyond their national market. It is the first ever analysis of the expansion strategies of radio groups across Europe, including their footprint in each market in which they operate, from the political economy of cultural industries. The article maps the main radio groups in Europe, analyses cross-national champions in depth and establishes three main types. This study shows that, thanks to the possibilities of a deregulated market, strengthening the role of the brand and the format, and the agreements with other groups, broadcasting radio has overcome the obstacles that, historically, hindered its cross-border expansion.