Alleghany Corporation is an insurance holding company. The Company, through its subsidiary Alleghany Insurance Holdings LLC (AIHL) and its subsidiaries, is engaged in the property and casualty insurance business. AIHL's insurance operations are conducted by its subsidiaries RSUI Group, Inc. (RSUI), CapSpecialty, Inc. (CapSpecialty) and Pacific Compensation Corporation (PacificComp). Its segments include reinsurance and insurance. Its reinsurance segment consists of property and casualty reinsurance operations conducted by Transatlantic Holdings, Inc. reinsurance operating subsidiaries. Its insurance segment consists of property and casualty insurance operations conducted by AIHL through its insurance operating subsidiaries RSUI, CapSpecialty and PacificComp. AIHL Re LLC, which is a captive reinsurance company, provides reinsurance to its insurance operating subsidiaries and affiliates.