Kraft Heinz's top investor, Warren Buffett's Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), also hasn't sold any shares after engineering Kraft's initial merger with Heinz. Yet progress has been glacial, and even 3G Capital -- Kraft's second largest shareholder -- subsequently sold 25 million shares and reduced its overall stake to about 20% by late September. But during the conference call it warned that its full-year adjusted EBITDA would decline nearly 8%, due to divestments, supply chain cost and commodity inflation, aggressive competition, and currency headwinds.