Alleghany Corporation is an investment holding company originally created by the railroad entrepreneurs Oris and Mantis Van Sweringen as a holding company for their railroad interests. Alleghany’s property and casualty subsidiaries include: Transatlantic Holdings, a leading global reinsurer; RSUI Group, which underwrites wholesale specialty insurance coverages including property, casualty, professional liability and directors' and officers' liability; and CapSpecialty, an underwriter of commercial property, casualty and surety insurance coverages.