W. R. Berkley Corporation (W. R. Berkley) is an insurance holding company. The Company operates in the three segments of the property casualty insurance business: Insurance-Domestic, Insurance-International and Reinsurance-Global. The Company�s Insurance -Domestic operating units underwrite specialty risks within the excess and surplus lines market and on an admitted basis. The Company through its Insurance-International operating units writes business in almost 40 countries across the world, with branches or offices in 15 locations outside the United States, including the United Kingdom, Continental Europe, South America, Canada, Scandinavia, and Australia. The Company provides other insurance companies and self-insureds with assistance in managing their net risk through reinsurance on either a portfolio basis, through treaty reinsurance, or on an individual basis, through facultative reinsurance.