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.

The Financial Times Stock Exchange 100 Index, also called the FTSE 100 Index, FTSE 100, FTSE, or, informally, the "Footsie", is the United Kingdom's best-known stock market index of the 100 most highly capitalised blue chip companies listed on the London Stock Exchange. Founded in 1984 by the Stock Exchange to better reflect activity on the market, it replaced the Financial Times own FT 30.