The encyclopedia · Strategy & Leadership · Financial decision · 2014–2025
Oi was Brazil’s largest telecom — a bad merger made it the country’s biggest bankruptcy
Brazil’s largest fixed-line operator filed for bankruptcy in 2016 with US$19B debt — the country’s biggest corporate loss. The company was liquidated in 2025.
Oi · 2016-06-20
What happened
Oi was Brazil’s largest fixed-line telecommunications operator, formed in 1998 from the merger of several state-owned telecom companies after the privatisation of Telebrás. It served millions of residential and corporate customers across Brazil and was one of the country’s most recognisable brands.
The company’s downfall began with its troubled merger with Portugal Telecom in 2014. The deal was supposed to create a combined entity with economies of scale, but Oi’s management soon discovered that Portugal Telecom had a cash flow problem that drained the capital Oi needed for its own operations. The merger left Oi with massive debt and no path to profitability.
On 20 June 2016, Oi filed for bankruptcy protection with US$19 billion (R$65 billion) in debt — the largest corporate bankruptcy filing in Brazilian history. The company spent years in restructuring. It sold its mobile assets to TIM, Vivo, and Claro for R$16.5 billion in December 2020. Oi was declared bankrupt in 2025 and ordered to liquidate all assets, with approximately €5.7 billion in unpaid debt.
Why it happened
- Oi’s merger with Portugal Telecom was catastrophic. Oi discovered after the deal Portugal Telecom had a cash flow problem that consumed the capital Oi needed, leaving it unable to service its debt.
- Oi took on massive debt to fund the merger. The combined company had US$19B in debt, and expected synergies never came because the Portuguese operation was in worse shape than disclosed.
- Oi was slow to adapt from fixed-line to mobile. Its core business was declining, and the mobile assets it sold for R$16.5 billion were its most valuable remaining assets.
The lesson
A merger that is supposed to save a company can destroy it if the target is hiding problems. Oi bought Portugal Telecom for its capital, but the capital was already gone before the deal closed.
Sources
- Oi (telecommunications) — Wikipedia
- CNBC — Brazil's Oi files for bankruptcy protection after failing to restructure debt (20 Jun 2016; 65.4 billion reais / $19.3 billion in debt; Brazil's largest-ever bankruptcy petition per Thomson Reuters)
- NYT DealBook — Oi of Brazil agrees to sell Portugal Telecom assets to Altice (9 Dec 2014; merger announced Oct 2013 'has proved disastrous'; PT's Rioforte exposure; €7.4B sale to Altice)
- Converge Digest — Brazil's Oi mobile assets acquired (15 Dec 2020; mobile unit sold for 16.5 billion reais / $3.23 billion to Telefónica, TIM and Claro in bankruptcy proceedings)
- Developing Telecoms — Brazil's Oi is bankrupt, but is this really the end? (11 Nov 2025; bankruptcy decreed by 7th Business Court of Rio de Janeiro; first restructuring ran 2016–2022)
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