Warren Buffett is one of the most widely followed investment managers in the world. And there's good reason for that. His track record of market-beating returns dates back to the 1950s when he founded Buffett Limited Partners.

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.

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