No buybacks, a Kraft Heinz sting, and declining profits for Berkshire. But is the market overreacting to a still-strong long-term play?

Berkshire Hathaway has resumed acquiring shares of Warren Buffett's favorite media stock. Other insider buyers are focused on three biotech stocks.

B erkshire Hathaway bought about $106 million of stock in Sirius XM Holdings and sold around $230 million of DaVita shares in recent days, according to Form 4 filings with the Securities and Exchange Commission late Monday.