KOST 103.5 is a radio station licensed to Los Angeles, California, with a Mainstream AC musical format. It is one of three Adult Contemporary-based formatted radio station in the Los Angeles/Orange County area, the others being sister station KBIG (Hot AC) and CBS-owned Smooth/Urban AC KTWV. KOST broadcasts Christmas music from November to December each year. The station is one of the top rated radio stations in Los Angeles and one of the top revenue billing radio stations in the United States.
