Buffett invested in Heinz in 2013 and two years later, Heinz merged with Kraft Foods. He bought 326 million shares during this merger at a cost of around $24.6 billion. He has held on to that stake, which is now worth $11.4 billion.

Some of the Oracle of Omaha's most-popular buys -- as well as Berkshire's largest holding -- offer robust upside potential in 2025.

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.