While American investors obsess over AI stocks, a Brazilian fintech company has been quietly building one of the most impressive growth stories in global finance. Nu Holdings — ticker NU — now serves 127 million customers across Latin America, and it’s doing so at a cost that makes traditional banks look like dinosaurs.
Here’s the number that should make every bank CEO sweat: Nu spends roughly $0.90 per month to service each customer. Traditional Brazilian banks? They spend $12 to $15. That’s not a marginal advantage — it’s a 93% cost reduction that lets Nu profitably serve millions of people the big banks had written off as too expensive to bother with.
The company started in 2013 when David Velez, a Colombian-born venture capitalist working for Sequoia in São Paulo, tried to open a local bank account. It took months. Instead of complaining, he built a better bank. Along with co-founders Cristina Junqueira, an experienced Brazilian banker, and Edward Wible, an American engineer, they built the entire tech stack from scratch — a massive advantage over incumbents running on decades-old software that makes innovation nearly impossible.
Nu’s first product was a simple, no-fee credit card. It spread almost entirely by word of mouth because in a market where banking was synonymous with abuse, Nu’s customer satisfaction scores (Net Promoter Score in the 90s out of 100) were virtually unheard of. The company didn’t just offer a service — it started a movement.
The skeptics said it would blow up on credit losses. Nu’s answer was the “low and grow” model: issue micro-limits as low as $10 to new borrowers, observe real-time payment behavior and smartphone data, then gradually increase limits as trust is established. The result? A return on equity of 31% as of late 2025 — astronomically high in banking, where 12% is considered solid.
Now Nu is exporting its playbook. In Mexico, where cash still dominates and banking penetration is even lower than Brazil, the company hit 13 million customers in just two years by partnering with retail giant OXXO’s 23,000+ locations for physical cash deposits. Earlier this year, Nu received conditional approval for a U.S. National Bank charter, eyeing the massive cash remittance corridor between North and South America.
The stock isn’t cheap — it trades at over 7x book value, compared to JPMorgan’s 1.2-2.5x. But comparing Nu to a traditional bank misses the point entirely. With its efficiency and growth trajectory, it functions more like a high-margin software business that happens to hold a banking license. For investors looking beyond the U.S. tech bubble, Nu might be the most compelling fintech story on the planet right now.