Would you sell any? I almost never sell any of my blue chips except when there's a tax benefit to be had in doing so. In the past, BRK has responded to its falling shares by buying dips on the open market. They had $147 billion in cash, last reported and may have more after this: "Berkshire Hathaway exits Marsh McLennan position, holds Aon, Markel" from August 15. "