Auto Trader's current CFO Sean Glithero, is due to step down from the role later this year, with his successor Nathan Coe already in place.
Glithero is to move to peer-to-peer lender Funding Circle and will therefore not be standing for re-election at Auto Trader's Annual General Meeting on 21 September.
Nathan Coe, who joined the company in 2007 and has played a key part in its transition from a magazine business to a digital operation, will succeed him and combine the position with his existing responsibilities as chief operating officer.
Prior to joining Auto Trader, Coe was a corporate finance professional at both PwC and Telstra.
Glithero will remain as chief financial officer for the time being to ensure a smooth transition of his responsibilities, with a handover date to be mutually agreed.
Ed Williams, chairman of Auto Trader, said: "We would like to thank Sean for his significant contribution to the success of Auto Trader.