Warren Buffett's Berkshire Hathaway sells some DaVita; Shares fall on disappointing guidance
1. DaVita's shares dropped 8% after weak profit outlook. 2. Company cites rising care costs and center closures impacting profits. 3. Berkshire Hathaway reduced its stake to 45% in DaVita. 4. DaVita's fourth-quarter earnings exceeded analyst expectations despite challenges. 5. Weak guidance may affect investor sentiment towards healthcare stocks.