Oi, also known as Oi S.A., is a publicly owned company headquartered in Brazil and operates as a subsidiary of Mileto Tecnologia. Founded in 1998, the company employs approximately 19,860 individuals and reported $592.5M in revenue as of 2024. Functioning as a tier 1 media tech buyer, the company specializes as a telecoms operator, having been formally known as Telemar.
S&P Global Ratings discontinued its ratings on Oi S.A. on March 10, 2026, following the agency's downgrade of the company to 'D' after Oi missed an interest payment on its 2026 senior secured notes due in January. Earlier, on January 29, 2026, the Public Ministry of the State of Rio de Janeiro defended that Oi should bear approximately R$ 53.9 million for the severance pay of 1,741 workers of Serede – Serviços de Rede S.A., a manifestation filed in the company's judicial recovery process. This followed Oi obtaining access to R$ 517.4 million on November 28, 2025, after an agreement with the agency Anatel. Previously, on November 26, 2025, Pacific Investment Management Company (Pimco) sold its entire stake in Oi S.A., with funds managed and advised by Pimco divesting all 64,811,440 common shares, representing 19.73% of the company’s total capital.
Oi offers 5 products in the media and telecoms services industry. Oi's product portfolio comprises of media and TV services and telecoms.
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Oi's revenues were $592.5M in 2024. Caretta Research has split Oi's revenue into 5 different product categories, the largest of which is mobile services, which represents 33% of Oi's revenue.
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