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.

One of those value plays is Kraft Heinz ( KHC 0.72%), which trades at just 9 times forward earnings and pays a hefty forward dividend yield of 5.5%. Buffett gained 326 million shares of Kraft Heinz in 2015 after driving Kraft Foods to merge with H.J. Heinz, and he hasn't ever sold a single share.

Warren Buffett-led Berkshire Hathaway's (NYSE: BRK.A)(NYSE: BRK.B) had a substantial investment in General Motors (NYSE: GM). According to Berkshire's SEC filings, the conglomerate owned 50 million shares of GM at the beginning of that year,

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

Warren Buffett is one of the better-known and successful investors. His Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) portfolio has consistently outperformed the S&P 500 (SNPINDEX: ^GSPC) since its inception in the mid-1960s.