Warren Buffett told reporters at his annual meeting that Kraft Heinz's auditor, PwC, has not signed off on the company's annual report, according to CNBC. "They have to explain why they haven't signed off, but they haven't signed off...There's something going on," Buffett said. Shares of Kraft Heinz (KHC), which are down 24% year-to-date, closed Friday up 40c to $32.58. 

Berkshire Hathaway (BRK-A, BRK-B) said in today's earnings release, "As of May 3, 2019, Kraft Heinz has not filed its 2018 Form 10-K with the Securities and Exchange Commission. In addition, Kraft Heinz has not made its financial statements for the first quarter of 2019 available to Berkshire. Accordingly, Berkshire does not have the necessary financial information to determine its share of the earnings of Kraft Heinz for the first quarter of 2019. As a result, Berkshire's first quarter 2019 other operating earnings excludes such amount.

Berkshire will record its share of Kraft Heinz's earnings for the three months ended March 31, 2019 during the period that such information becomes available. Other operating earnings in the first quarter of 2018 included $234 million related to Berkshire's investment in Kraft Heinz. At March 31, 2019, insurance float (the net liabilities we assume under insurance contracts) was approximately $124 billion, an increase of approximately $1 billion since year end 2018."