$BTC Holdings is a digital banking company that was launched in Brazil about a decade ago, and currently has over 100 million customers in Brazil, Colombia, and Mexico.

While "Nubank" is considered one of the largest competing digital banks in the world, it allows users to trade Bitcoin and other cryptocurrencies.

It also launched its own cryptocurrency trading platform, "No Crypto," in 2023, which acquired over a million users in its first month.

Berkshire Hathaway, led by Buffett, initially invested $500 million in Nubank in 2021 before its initial public offering.

The legendary investor currently owns over 86 million shares in the company, as of the third quarter of 2024.

These shares are valued at $1.179 billion, according to the electronic brokerage Benzinga. The 94-year-old man has not sold a single share in the company since acquiring his stake. While the stock dipped slightly at the end of last year, it has risen about 27% in 2024. This came after a strong year in 2023, where the stock rose about 100%.