If you're looking for a high-growth stock in an exploding industry operating in an underpenetrated region, look no further than the Brazilian fintech Nu Holdings (NYSE: NU). This lesser-known Warren Buffett holding is demonstrating incredible performance, and there are many reasons to be confident about its continued prospects. Here are three reasons to buy:

Nu is still a fairly young company, with $6.5 billion in trailing-12-month revenue, and is making a big splash in the three countries it operates in right now. The business is headquartered in Brazil, where it already counts 54% of the adult population as members.

And Nu is still adding millions of customers each quarter and ramping up new launches for its credit products, targeting new demographics, including the affluent. 

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Source Fool.com