Berkshire Hathaway Inc. is a multinational conglomerate holding company that oversees and manages a diverse portfolio of subsidiaries. Berkshire Hathaway wholly owns GEICO, BNSF, Lubrizol, Dairy Queen, Fruit of the Loom, Helzberg Diamonds, FlightSafety International, and NetJets, and has significant holdings in Heinz, Mars, American Express, The Coca-Cola Company, Wells Fargo, and IBM. Berkshire Hathaway-owned Stern/Leach Company is a major supplier of silver to the U.S. Mint, and FlightSafety International provides aviation training systems and services to the U.S. Air Force.