Berkshire Hathaway is a world.renowned insurance and diversified investment group, headquartered in the United States. The company is principally engaged in property / casualty insurance and reinsurance business through national security companies and GEICO and reinsurance giants general affiliated companies such as Cologne Reinsurance. Berkshire Hathaway has a stake in the jewelry distribution chain Helzberb Diamonds, candy company See's Candies, Inc., engaged in flight training business, as well as H. H. Brown and Dexter.