Kraft Heinz (KHC 1.71%) is a powerhouse consumer staple. Its owns several iconic brands that produce consistent cash flows and dividends for shareholders. But since the 2015 merger between Kraft Foods and H.J. Heinz, the stock is down 60% as of this writing, trailing the S&P 500's return of 155%. Despite the underperformance, Warren Buffett's Berkshire Hathaway remains the company's largest shareholder. At the end of 2024, Berkshire Hathaway held 27.2% of the company's shares. Buffett is famous for his pati ...