The Watford-based bridging specialist is interviewing for his replacement and a new CEO appointment is expected to be made during February.
Alan, who has been with the company 13 years, is leaving to pursue a new opportunity with United Trust Bank.
Cheval director Allan Kay said: "We are naturally disappointed that Alan is leaving, but wish him well in his future career."
Alan Margolis said: "I will be sorry to leave Cheval after so many years, but I am looking forward to my new opportunity."
