Kraft Heinz shares dropped after the food company said in a regulatory filing that its biggest stockholder—Berkshire Hathaway—could sell nearly all of its shares. The investment conglomerate's stake in Kraft Heinz totals 325.

The food giant is in the process of unraveling its 2015 merger between Kraft Foods and Heinz, as it intends to split into two publicly traded companies.

Warren Buffett has famously said investors should be “fearful when others are greedy and greedy when others are fearful.

The Kraft Heinz Company (KHC) fell sharply in premarket action after filing paperwork with the SEC that indicated Berkshire Hathaway (BRK.A) (BRK.B) is likely to sell all or parts of its massive block of shares.

Berkshire Hathaway may unload its 27.5% stake in Kraft Heinz , according to a regulatory filing on Tuesday, potentially ending a more than deca