Sir John Robert Madejski, OBE, DL is an English businessman, with commercial interests spanning property, broadcast media, hotels, restaurants, publishing and football.

Auto Trader Group plc, commonly known as Auto Trader, is a British automotive online marketplace and classified advertising business. It enables the buying and selling of new and used vehicles by private sellers and trade retailers. Auto Trader is listed on the London Stock Exchange trading under the ticker symbol AUTO, and is a constituent of the FTSE 100 Index.