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

Buffett strongly believes in concentrating Berkshire Hathaway's investment capital into his best ideas. Five top-tier companies, with clear competitive advantages and phenomenal capital-return programs,

Warren Buffett’s Berkshire Hathaway (BRK.A) (BRK.B) has recently increased its stake in Sirius XM Holdings Inc. (SIRI), now owning over 35% of

Berkshire Hathaway basically owns other companies. A lot of companies are structured this way, but what sets Berkshire apart is the vast number of companies that live underneath its broad umbrella. Those companies span a surprising range of industries.

Warren Buffett's cash reserves have been at all-time highs but he's put some of that back to work, scooping up more shares Occidental Petroleum, building his stake to more than 28% in the company. Buffett's Berkshire Hathaway purchased 763,

Key Takeaways Warren Buffett’s Berkshire Hathaway purchased 763,017 shares of Occidental Petroleum on Friday for $35.7 million, according to a regulatory filing Tuesday.The investment firm has grown its stake in recent years,