Like many subscribers to satellite radio, when Buffett dials into something he likes, he doesn't mind turning up the volume -- even if it isn't popular with mainstream audiences. Berkshire Hathaway initially had some skin in Sirius XM through tracking shares that offered a way into the common stock at a discount.

Warren Buffett is widely regarded as one of the greatest investing minds of all time. The "Oracle of Omaha" earned a bachelor's degree from the University of Nebraska and a master's degree in economics from Columbia University, where he studied under legendary investor Benjamin Graham.

It wasn’t just Apple shares that Buffett-led Berkshire Hathaway sold last year. The company also cut its stake in Bank of America by 34 per cent. Since then, Apple and Bank of America have seen their share prices decline by 15 per cent and 20 per cent respectively,