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

The Omaha, Nebraska-based conglomerate purchased roughly 2.3 million shares for about $54 million in separate transactions Thursday through Monday.