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The Purple Revolution

How Nu Dismantled the Brazilian Banking Cartel

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Wonder Stocks
Feb 28, 2026
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Genuinely revolutionary businesses are few and far between. They are the ones intent on tearing down entrenched norms. What defines them is an intense, almost single-minded focus on the customer, an unyielding determination to strip out inconvenience, and a mindset that treats systemic industry dysfunction not as a problem, but as an opportunity.

This is the tale of a company that brought that philosophy to bear on one of the most heavily defended and inefficient sectors anywhere: Brazil’s banking system. Nu Holdings, better known worldwide as Nu, is a financial technology group that is overturning the traditional, complacent banking model.

By servicing the unbanked and the underappreciated with a level of dignity previously reserved for the wealthy, it has built a financial engine that rivals technology firms in efficiency, but beats them in heart.

It is a story of how a Colombian outsider, a disillusioned insider, and a brilliant coder took on a cartel of five giant banks and changed the lives of millions. It is a wonderful company but is it a Wonder Stock? Read on to find out.

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Nubank's credit cards are purple as a bold, strategic branding choice to stand out from traditional banks' boring corporate colours.

Contents

This article is about a wonderful business and will explain:

  • The history of why the Brazilian banking system became so bad for customers.

  • How three visionaries built the most popular financial services business in Latin America in just a few years.

  • How the company is able to crush the competition with efficiency.

  • What fanatical dedication to customer service can yield in an environment where the competitions treats customers badly.

  • Why this model of efficiency and customer satisfaction can be exported around the world.

  • What this may mean for long-term returns for those with the vision to back it.

This Deep Dive contains financial terms. Definitions can be found in the Wonder Stocks Glossary.

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