The Brazilian digital bank Nu Holdings (NYSE: NU), which is backed by Warren Buffett's company Berkshire Hathaway, recently delivered strong fourth-quarter results, reporting a $58 million profit on revenue of roughly $1.45 billion.

The bank continued to build on positive trends seen in 2022, growing customers strongly and cross-selling other financial products to its large customer base.

But Nu also did something in Q4 that investors haven't seen in the past. I thought it was flat out the most impressive number in the fintech company's earnings report. Let's take a look.

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Source Fool.com