The conglomerate holding company founded by billionaire investor Warren Buffet is the 7th largest company in the U.S. with a current valuation of over $630.2 billion. It is also the last non-tech company in the list. The Omaha, Nebraska-based company holds stake in several industries and big companies.The company wholly owns GEICO, Duracell, Dairy Queen, BNSF, Lubrizol, Fruit of the Loom, Helzberg Diamonds, Long & Foster, FlightSafety International, Pampered Chef, Forest River, and NetJets. It also owns 26.7% stake in Kraft Heinz Company, 18.8% of American Express, 9.32% of The Coca-Cola Company, 11.9% of Bank of America and 6.3% in Apple, as of 2018.Berkshire Hathaway is also known for having the most expensive share in history with Class A shares costing around $415,000. The stock has gained over 60% in the 52-week period.