Los 40

Los 40, formerly known as Los 40 Principales, are a brand name of radio stations originating from Spain. It is broadcast in 12 countries under the same brand name, with 29 million listeners across Spain and Latin America. Its format is the adult contemporary hits, more commonly known as the CHR format, primarily to top 40 charts inspired by radio stations in the United States.

Contents
1966–1987	1966–1979	1979–1987	1987–1989	1990–1991	1991–1992
1992–1994	1994–1995	1995–2000	2000	2000–2002	2002–2004
2004–2005	2005–2006	2006–2016	2016–present

Ser FM

1966–1987

Los 40 Principales

1966–1979

Originally started as a radio program on Radio Madrid (Cadena SER). It became a standalone radio station in 1979 and independent from SER in 1987.

1979–1987

Cadena 40

1987–1989

1990–1991

Cadena 40 Principales

1991–1992

25th Anniversary

1992–1994

1994–1995

1995–2000

Radio 40 Principales

2000

40 Principales

2000-2002

2002–2004

2004–2005

2005–2006

2006–2016

40th Anniversary

50th Anniversary (1st Version)

Los 40

2016–present

50th Anniversary (2nd Version)

40 Logo

1966–1979

1979–1987

1987–1989

1990–1992

1992–1994

1994–1995

1995–2004

2004–2005

2005–2006

2006–2016