Alleghany Corporation is engaged, through its subsidiary, Alleghany Insurance Holdings LLC, and its subsidiaries, RSUI Group, Inc., Capitol Transamerica Corporation, Darwin Professional Underwriters, Inc. and Platte River Insurance Company, in the property and casualty and fidelity and surety insurance businesses. Through its subsidiaries, World Minerals Inc., Celite Corporation and Harborlite Corporation and their subsidiaries, Alleghany is engaged in the industrial minerals business. Alleghany also conducts a steel fastener importing and distribution business through its subsidiary, Heads & Threads International LLC. Through its subsidiary, Alleghany Properties, Inc., the Company owns and manages properties in California.