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

Warren Buffett’s Berkshire Hathaway has spent another $54 million to purchase Sirius XM stock, giving it a stake of more than 35% in the satellite-radio company.