Kraft Heinz (NASDAQ: KHC) opened in the red this morning after Berkshire Hathaway (NYSE: BRK.B) registered its entire stake (27.5%) in the packaged foods specialist for resale. The filing signals Berkshire's intent, under Greg Abel's leadership, to unwind a long-held position in the food giant – a legacy of Warren Buffett who championed Kraft-Heinz merger in 2015. Kraft Heinz stock tanked nearly 8% on the news, reflecting investor anxiety about losing a corner-stone shareholder at a time when the company is ...