The investment firm's usual combine-and-cut formula failed miserably at Kraft Heinz. Since Lemann teamed up with none other than Warren Buffett to do the deal, sales and profits have tanked. 3G's dream of turning Kraft Heinz into the savior of Big Food ended when Unilever rebuffed its $143 billion takeover offer in 2017. This February, Kraft Heinz took a staggering $15.4 billion writedown. The company's stock has plunged more than 70% from its peak, helping to drag down rivals like Kellogg, Campbell Soup and General Mills.