(Reuters) -Class A shares of Warren Buffett's Berkshire Hathaway fell more than 3% in afternoon trading on Monday, as investors fretted over a $3.8 billion write-down and a dip in quarterly operating profit that the firm disclosed on Saturday.

Warren Buffett's company reported less than half as much profit in the second quarter as it took a $3.76 billion writedown on the value of its stake in Kraft Heinz as that iconic food producer considers largely undoing the merger that Berkshire Hathaway helped bankroll.

Berkshire Hathaway, the conglomerate run by legendary investor and soon-to-be-departing CEO Warren Buffett, on Saturday reported that it had recorded a nearly $5 billion second-quarter write-down of Kraft Heinz shares.