It's been a while since I've been observing how the largest bank in Brazil and its counterparts continue to dominate the financial system, despite all this wave of fintechs we see around. And it's no coincidence — we're talking about institutions that move trillions in assets.

When it comes to bank rankings, many people only think about network size or number of branches. But in reality, what defines the biggest bank in Brazil goes far beyond that. The real criteria that matter are total assets under management, customer base, net profit, credit market share, and systemic importance. These numbers don't lie.

Banco do Brasil leads with 1.85 trillion in assets and 70 million customers. Then comes Caixa with 1.72 trillion, Itaú with 1.60 trillion, and Bradesco with 1.45 trillion. Santander, Safra, Votorantim, and others complete the ranking. But here’s the interesting detail: having more assets doesn't necessarily mean being more profitable. Itaú, for example, has fewer assets than BB but generates more profit — 32 billion versus 28 billion. That says a lot about operational efficiency.

Public banks like the largest bank in Brazil and Caixa play a very different role from private banks. While BB and Caixa focus on credit policies, housing, and economic development, Itaú, Bradesco, and Santander prioritize profitability and innovation. Each has its niche, but all coexist within the same ecosystem.

What catches my attention is how these institutions remain relevant despite fintech competition. Nubank, Inter, C6 Bank have grown a lot among the younger audience, but the big banks haven't lost ground. On the contrary, many have invested heavily in technology and apps, maintaining their dominant position in corporate operations and large credit volumes.

Thinking about the impact on the economy, the largest bank in Brazil and its peers are absolutely central. They finance companies, grant credit to families, manage investments. In times of crisis, public banks act countercyclically to maintain liquidity. Private banks, on the other hand, bring efficiency and competitive pressure. The result is a system that, despite the challenges, continues to enable investments and consumption in the country.

ROE is also interesting to monitor. Itaú has 18.2%, Bradesco 16.8%, Santander 14.5%. The higher this ratio, the better the bank is at turning equity into profit. BTG Pactual is at 21.5%, but operates in a very different niche focused on wealth management.

If you're thinking about investing in banking stocks, the important thing is to look at fundamentals, operational efficiency, and track record. These numbers from the largest bank in Brazil and the others show that the sector remains dynamic, even with all the digital transformations happening. We're seeing consolidation, innovation, and competition happening simultaneously — it's a market worth watching.