Los 40 Principales

Los 40 Principales, also known as LOS40 or Los Cuarenta, is a privately owned company headquartered in Argentina. Founded in 1987, the company employs approximately 60 individuals and operates under SER Comunicacion as a tier 1 media tech buyer. The company specializes in broadcast television and radio, functioning as a commercial radio station and multimedia brand focused on pop, urban, and contemporary hit radio (CHR). It is part of the global LOS40 network, owned by PRISA Media (Grupo PRISA). In Argentina, the station is operated under a management and brand licensing agreement by the Nostalgie Américas group (associated with Santamaría Media). Headquartered in Buenos Aires, the station broadcasts on the 105.5 MHz frequency (FM) and reaches a national audience through a network of affiliates and a digital ecosystem.