OIBR4 on São Paulo Stock Exchange

Oi

Logo: Oi, Public domain, via Wikimedia Commons3

Brazilian telecommunication company

Oi (IPA: [ˈoj], Portuguese for "Hi"), formerly known as Telemar, was the largest fixed telephone operator and the fourth mobile telephone operator in Brazil, being the third largest telecommunication company in Latin America. It is headquartered in Rio de Janeiro.2 From Wikipedia, CC BY-SA 4.0

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Last updated Oct 16, 2026.

Overview

1998Founded1

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  • TickerOIBR4 on São Paulo Stock Exchange1
  • Industrymobile phone industry, telecommunications industry1
  • HeadquartersBrasília1
  • Websitewww.oi.com.br
  • Legal formjoint-stock company1

Oi (IPA: [ˈoj], Portuguese for "Hi"), formerly known as Telemar, was the largest fixed telephone operator and the fourth mobile telephone operator in Brazil, being the third largest telecommunication company in Latin America. It is headquartered in Rio de Janeiro.2

How it started

History

Oi (then known as Telemar) was formed as Tele Norte Leste to merge sixteen state-owned incumbent local exchange carriers, during the privatization of Brazilian telecommunications system. Each carrier served a particular Brazilian state in the northern, northeastern and southeastern part of the country. In the break-up of Telebras in 1998 it was sold to a consortium led by the Brazilian construction firm Andrade Gutierrez (21.2%) and Inepar Holdings (20%) as well as other Brazilian corporate and individual investors. The consortium paid 3.434 billion reais.

The states that formed the base of Telemar at its inception were Rio de Janeiro, Minas Gerais, Espírito Santo, Bahia, Sergipe, Alagoas, Pernambuco, Paraíba, Rio Grande do Norte, Piauí, Ceará, Maranhão, Pará, Amazonas, Amapá and Roraima, corresponding to 65% of the Brazilian territory and 20 million households.

Initially, Telemar was allowed to offer only local voice and data services and interstate long-distance voice services. Today, Telemar and its subsidiaries offer local, long-distance and international voice and data services, besides a growing mobile phone network.

In April 2006, it was announced that Telemar would restructure itself, merging its three holding companies into a single company, that would have been named either Telemar Participações S.A. or Oi Participações S.A. However, those plans failed, since there was no consensus between Telemar shareholders. But on March 1, 2007, Telemar rebranded itself to "Oi", unifying all of its companies and services under the Oi umbrella. The company is still legally known as "Telemar Norte Leste S.A.", "Tele Norte Leste Participações S.A." and "Telemar Participações S.A.". Oi owns the brands:

Oi Voip (Voice over IP)

From Wikipedia’s article on Oi, shared under CC BY-SA 4.0.2

Products and brands

  • landline telephone

Listed on Wikidata.1

Subsidiaries and ownership

Owners

  • Attempted merger of Oi and Portugal Telecom

Subsidiaries

From Wikidata.1

Timeline

  1. Sep 28, 2021Went public Listed on São Paulo Stock Exchange1
  2. 1998Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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