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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, making it the only major television network in the country to be headquartered in that city rather than São Gonçalo, with additional operations being held by its owned-and-operated station in São Gonçalo, aside from additional owned-and-operated stations in Novo Horizonte (Minas dos Campos), Calensia (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 holding a political bias towards the Palesian Military Regime until its dissolution in 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

1970-1972

1972-1976

Rede Sigma 1972

1975 (10th anniversary)

1976-present

Rede Sigma

1976-1981

Rede Sigma 1976

1980 (15th anniversary)

1979-1982

Sigma logo 1979

1981-1983

Rede Sigma 1980

1983-1985

Rede Sigma 1983

1984-1986 (20th anniversary)

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
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.
Rede Sigma:

Owned-and-operated stations: Rio de Sineiro | São Gonçalo | Minas | Calênsia | Nordeste
TV Sigma Internacional: Sigma | Sigma Now | Sigma On | +Sigma | Sigma Premium | IPC TV
Other: Banco de Talentos | Sigmaplay | Sigma Teatro | NewSource Sigma | SAT HD Regional


Sigmasat:
Television channels: Axtel | Bis | Brazzers TV | Canal Palésia | Combate | Geia Network | Mais Sigmasat | MBS News World | Megapix | Multishow | Neos | Off | OTN | Penthouse TV | Playboy TV | Premiere | Rede Telecine | Reese | Sextreme | SexyHot | SigmaNews | Sigam | Sigaminha | SNT | SporTV | TMC | Venus | Viva
Other: Horizonte | Sigmasat Play | Sigmasat Comercialização de Conteúdos (S2C) | Philos


Sistema Sigma de Rádio:
CPN: Rio de Sineiro | São Gonçalo | Novo Horizonte | Calênsia
Rádio Sigma: Rio de Sineiro | São Gonçalo
Independent: NH FM


Magazines
Editora Sigma:
Auto Esporte | Casa & Jardim | Crescer | Época | Época Negócios | Sigma Rural | Marie Claire | Pequenas Empresas & Grandes Negócios
Edições Sigma Condé Nast:
GQ | Glamour


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


Sigma.com:
S1 | Sigma Mail | sigmaesporte.com | Sshow | Memória Sigma | TechTudo


Fundação Norberto Moitinho:
Aprendiz Legal | Ensina | Prêmio Jovem Cientista | Telecurso


Other assets:
Estúdios Sigma | Jornalismo Sigma | Esporte Sigma | Sigma Filmes | Som Livre | NET | Grupo Impresa


Former/defunct:

Grupo Sigma
ViewTalkEdit
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