National Interstate Corporation and its subsidiaries operate as an insurance holding company that underwrites and sells traditional and alternative property and casualty insurance products primarily to the passenger transportation, trucking and moving and storage industries, general commercial insurance to small businesses in Hawaii and Alaska and personal insurance to owners of recreational vehicles and commercial vehicles throughout the United States. The Company is a specialty property and casualty insurance company with a focus on the transportation industry. The Company offers over 35 product lines in the specialty property and casualty insurance market, which it groups into four general business components (alternative risk transfer (ART), transportation, specialty personal lines and Hawaii and Alaska) based on the class of business, insureds� risk participation or geographic location.