Alleghany Corp. engages in the provision of property, casualty reinsurance, insurance and financial services. It operates through the Reinsurance and Insurance segments. The Reinsurance segment consists of property and casualty and other reinsurance operations. The Insurance segment consists of property and casualty insurance operations. The company was founded by Oris Paxton Van Sweringen and Mantis James Van Sweringen in 1929 and is headquartered in New York, NY.