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.

When you think of stock market success, it's hard not to think about Warren Buffett. Buffett, known as the Oracle of Omaha, has been at the helm of Berkshire Hathaway ( BRK.A -3.04%) ( BRK.B -2.85%) since 1965 but plans to retire at the end of this year at the age of 95.