Marshall Motor Group has applied to float on the London Stock Exchange.
The expected admission date is April 1.
The dealer group's staff are understood to have been informed this morning.
The application states: "The group is the only dealer group in the UK to represent all of the top five prestige (being Audi, BMW, Mercedes-Benz, Land Rover and Jaguar) and top 10 volume (being Ford, Vauxhall, Volkswagen, Nissan, Peugeot, Toyota, Citroen, Hyundai, Kia and Skoda) vehicle manufacturer brands."
The broker is Investec.