Berkshire sold 20.7 million of those shares in the third quarter of 2024, but its 86.4 million remaining shares are still worth $949 million and give it a 1.8% stake in the company. Berkshire's stake in Nu only accounts for 0.3% of its entire portfolio, but the Latin American bank is still growing much faster than its brick-and-mortar competitors.

Warren Buffett and his team at Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) have long dabbled in bank stocks, owning almost every major Wall Street bank at one time or another over the past several decades.

S&P 500 investors are playing it safer in 2025 — so Warren Buffett's careful stock-picking is in style again.

With as impressive of an investing track record as Warren Buffett has achieved, you'd expect his Berkshire Hathaway portfolio would be loaded with great stocks. And you'd be right. The good news is that you don't need a huge amount of cash to buy many of those stocks.