As arguably the greatest investor of all time, Warren Buffett has made relatively few mistakes in his decades of investing. But Kraft Heinz ( KHC 0.45% ) was one of them. According to Buffett, Heinz overpaid for Kraft in 2015, which was a deal that Buffett's Berkshire Hathaway ( BRK.A 0.95% ) ( BRK.B 1.11% ) was involved with and mistakenly promoted.

Kraft Heinz stock has lost two-thirds of its value over the last decade and now sits at five-year lows. However, Berkshire Hathaway continues to own about 27% of the company. This equates to about 3% of the value of Berkshire's stock portfolio , meaning it's still a top Buffett stock in spite of its poor performance.

Buffett wishes he had paid a more attractive price for his stake in Kraft Heinz. But that's not the sa

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