Brazil’s Biggest Bank Quietly Bets On Its Digital Rival Nubank

Brazil’s biggest traditional bank is quietly investing in the digital upstart that forced it to change. Itaú Unibanco, long the symbol of old-style Brazilian banking, has now built a stake of about 106 million dollars in Nubank after buying another 3.8 million shares in the third quarter of 2025.

Those shares represent roughly 3.6% of Itaú’s investment portfolio, sitting alongside global blue chips like Nvidia, Amazon, Tesla and Coca-Cola. For decades, banking in Brazil was shaped by a small group of big institutions, heavy regulation and a close relationship with the state.

Fees were high, lines in branches were long, and millions of poorer Brazilians either used basic public-bank services or stayed outside the formal system. Credit often depended as much on political priorities and subsidies as on efficiency and competition.

Nubank came in as the opposite. No branches. A simple app. Low or zero fees and transparent conditions. That formula attracted about 127 million clients in Brazil, Mexico and Colombia, including around 110 million in Brazil alone.

Competition Reshaping Brazil’s Banking Game

The business is now highly profitable: in the third quarter of 2025, Nubank earned roughly 780 million dollars, with returns on equity near 30%. These numbers highlight how much value can be created when a bank cuts bureaucracy and focuses on technology and cost control.

Itaú is not backing away from the fight. It still posts quarterly profits above 2 billion dollars, has been closing branches, and is pouring money into technology and artificial intelligence to defend its franchise.

Yet by owning a slice of Nubank, it also shares in the upside of a lean, private-sector competitor that has grown without the political deals and subsidy schemes that often distort Brazil’s state-influenced credit market.

For observers, this is more than a corporate rivalry. It is a window into how Brazil changes when competition is allowed to pressure cozy arrangements.

The country’s largest incumbent is now paying to own part of the challenger that proved you can win tens of millions of customers simply by offering better service, clearer rules and more respect for people’s money.

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