Boasting a staggering market cap of $1 trillion, Berkshire Hathaway Inc. (BRK.B) is a global conglomerate led by Warren Buffett, known for its diverse businesses and investments. The Omaha, Nebraska-based company’s key operations include insurance (GEICO,

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.

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,