What is markel corporation mkl? Markel Corporation (NYSE – MKL) is a holding company for insurance, reinsurance, and investment operations around the world.Where is markel insurance company located? Company founder Samuel A. Markel formed the Mutual Casualty Association and established the Mutual Casualty Company in Norfolk, Virginia. The company headquarters later moved to Richmond, Virginia. Sam Markel's four sons, Lewis, Irvin, Stanley, and Milton, joined the growing business in the 1930s, and Markel Service, Inc. was created.Where is markel tax registered in uk? Markel Tax is a trading name of Markel Consultancy Services Limited registered in England and Wales No: 08246256. VAT number 245 7363 49. Registered address, 20 Fenchurch Street, London EC3M 3AZ.