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Rede Sigma, commonly known as just Sigma, is a Palesian commercial television network, being launched on April 26th, 1965 by businessman and journalist Norberto Moitinho, then-owner of sister newspaper O Sigma and sister radio station Rádio Sigma.

It is headquartered in Rio de Sineiro, with additional operations being held in São Gonçalo, aside from additional owned-and-operated stations in Novo Horizonte (Minas dos Campos), Calênsia (Distrito Federal) and Arrecife (Fernambuco), being owned by Grupo Sigma.

It is the country's largest and most watched television network, although it has also been criticized for its near monopolistic dominance in the media landscape, its quality decline over the years and its bias towards the Palesian Social Democracy Party (previously supporting the Military Regime that lasted from 1964 until 1985).

Its primary competitors are TelecordTV, EPT, Rede Viseirantes, Telerede and TV Educativa.

1965-1966

TV Sigma 1965

1966-1976

Rede Sigma 1966

1969-1970

1970-1976

1970-1972

1972-1976

Rede Sigma 1972

1975 (10th anniversary)

1975-present

Rede Sigma

1975-1981

Rede Sigma 1976

1980 (15th anniversary)

1979-1982

Sigma logo 1979

1980-1983

Rede Sigma 1980

1983-1985

Rede Sigma 1983

1984-1986 (20th anniversary)

Sigma 20 anos logo

1985-1992

Rede Sigma 1986

1989-1991

Rede Sigma 1989 Logo

1989-1991 (25th anniversary)

1990-1992

Rede Sigma Logo 1991

1991 (26th anniversary)

1992-1996

Rede Sigma Logo 1992

1994-1996

Rede Sigma 1992

1994-1996 (30th anniversary)

1996-2000

Rede Sigma 1996

2000-2005

Rede Sigma 2000

2005-2008

Rede Sigma 2005

2005 (40th anniversary)

2008-2014

Rede Sigma 2008

2010 (45th anniversary)

2011-2014

Rede Sigma 2011

2014-2015

Rede Sigma 2014

2015-present

Rede Sigma 2015

2015 (50th anniversary)

2020 (55th anniversary)

Rede Sigma 55 Anos

2020 (tentative)

Broadcast television networks in Palesia
Major broadcast networks:
Rede Sigma | TelecordTV | EPT | Rede Viseirantes | Telerede | TV Educativa

Minor broadcast networks:
TV Palésia | Canal Ensina | Rede 21 | Rede Familiar | Rede CPT | RPTV


Local broadcast networks:
Rainzon Sat | Correio


Defunct broadcast networks:
Rede Gupi | Rede Excelsa | Rede Megahertz


Digital speciality channels:
SigmaNews | Multishow | SporTV | SNT | Viva | Telecord News | VisNews TV | VisSports | Arte1 | MTV

ViewTalkEdit
Sigma Participação e Comunicações, S.A.
Canais Sigma:
Broadcast network:
Rede Sigma (RS | SG | MC | DF | NE)

Cable and satellite channels:
Axtel1 | Bis | Canal Palésia2 | Combate | Geia Network1 | Mais na Tela | MBS News World3 | Multishow | Neos1 | Off | OTN4 (Movies) | Premiere | Reese1 | SigmaNews | Sigam | Sigaminha | SNT | SporTV (2 | 3) | TMC4 (LCM | Crush | Top) | Viva

Rede Telecine5:
Telecine Premium | Telecine Action | Telecine Touch | Telecine Fun | Telecine Pipoca | Telecine Cult | Megapix

Playboy da Palésia Entretenimento6:
Brazzers TV | Penthouse TV | Playboy TV | Sextreme | SexyHot | Venus

TV Sigma Internacional:
Sigma | Sigma Now | Sigma On | +Sigma | Sigma Premium | IPC TV

Other:
Banco de Talentos | Canais Sigma | S2C | SAT HD Regional | Sigmaplay | Sigma Teatro


Sistema Sigma de Rádio:
AM/FM stations:
CPN (RS | SG | MC | DF) | Rádio Sigma (RS | SG) | NH FM

Cable and satellite audio channels:
Sound!


Grupo de Publicações Sigma:
Infosigma:
Extra | Expresso da Informação | O Sigma (Ela | Revista da TV) | Valor Econômico | Zap Imóveis

Editora Sigma:
Auto Esporte | Casa & Jardim | Crescer | Época | Época Negócios | Sigma Rural | Marie Claire | Pequenas Empresas & Grandes Negócios

Edições Sigma Condé Nast7:
GQ | Glamour


Sigma.com:
S1 | Sigma Mail | se.sigma | Sshow | Memória Sigma | TechTudo


Film, television and music production/distribution:
Film production:
Sigma Filmes | Telecine Productions

Television production/distribution:
Estúdios Sigma | Jornalismo Sigma (NewSource Sigma) | Esporte Sigma

Record label/home entertainment:
Som Livre


Fundação Norberto Moitinho:
Television channel: Ensina
Educational system: Telecurso
Other: Aprendiz Legal | Prêmio Jovem Cientista


Other assets:
NET8 (49%) | Grupo Impresa (17,5%)


Former/defunct:

1Channel under license from M3 Networks.
2Co-owned with a group of Palesian filmmakers.
3Distribution only, operated by MBS Media Group.
4Channel under license from Orbitel Holdings.
5Co-owned with Orbitel Holdings, Globecom Corporation, NBCUniversal, ViacomCBS and MGM Holdings.
6Co-owned with Playboy Enterprises, Private Media Group and MindGeek.
7Joint-venture with Condé Nast Publications.
8Co-owned with Orbitel Holdings.

Grupo Sigma
ViewTalkEdit
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