Sinking stocks and deteriorating prospects from an investment in Kraft Heinz Co pummeled the bottom line of Warren Buffett's Berkshire Hathaway Inc, which on Saturday reported a huge quarterly net loss even as operating profit soared. The fourth-quarter net loss was $25.39 billion, or $15,467 per Class A share (BRK/A), reflecting more than $27.6 billion of investment losses, including from stocks Berkshire still owns. That compared with a year-earlier profit of $32.55 billion, or $19,790 per Class A share, most of which resulted from a lowering of the U.S. corporate tax rate. Results included a $3.02 billion writedown for intangible assets that Buffett said was "almost entirely" attributable to Kraft Heinz, in which Berkshire owns a 26.7 percent stake. The packaged food company on Thursday shocked investors when it reported its own $15.4 billion writedown for Kraft, Oscar Mayer and other assets, and said U.S. securities regulators were examining its accounting practices.