DaVita shares tumbled after issuing a weak outlook amid rising care costs, while big investor Berkshire offloaded some shares in a pre-planned agreement.

Keep some cash on the sidelines waiting for the day (which will arrive sooner or later) when Berkshire Hathaway stock falls.

Berkshire Hathaway Inc. (NYSE: BRKa), led by Warren Buffett, increased its stake in Occidental Petroleum Corporation (NYSE: ...