Kraft Heinz share plunge loses Warren Buffett $4bn in one day

Shares in the food and beverage giant fell nearly 25% in Friday trading, Berkshire Hathaway has been particularly hard hitShares in the food and beverage giant Kraft Heinz fell nearly 25% in Friday trading, a day after the company wrote down by $15.4bn the value of its Kraft and Oscar Mayer brands.The company, which has disclosed that in October it received a subpoena from the Securities and Exchange Commission (SEC), has been battling pressure on the value of its brands since it came into exist