1854 William Cooper wuxuu London ka aasaasay shirkad xisaabineed, kaas oo noqday Cooper Brothers todobo sano ka dib markii saddexdiisii walaalood ay ku biireen. 1898 Robert H. Montgomery, William M. Lybrand, Adam A. Ross Jr. iyo walaalkiis T. Edward Ross waxay sameysteen Lybrand, Ross Brothers iyo Montgomery oo ku yaal Mareykanka. 1957 Cooper Brothers; Lybrand, Bros Ross & Montgomery iyo shirkad Canadian ah McDonald, Currie iyo Co waxay ku heshiiyeen inay qaataan magaca Coopers & Lybrand ee dhaqanka caalamiga ah. 1973 saddexda shirkadood ee xubnaha ka ah UK, US iyo Canada waxay magacyadooda u beddeleen Coopers & Lybrand. Kadibna 1980 Coopers & Lybrand waxay ballaarisay khibrada ay ku leedahay awood la'aanta iyagoo si weyn u iibsaday Cork Gully, oo ah shirkad hormuud u ah arintaas UK 1990 Wadamada qaarkood, oo ay ku jiraan UK, Coopers & Lybrand waxay ku biireen Deloitte Haskins & Sells iyo T. Edward Ross waxay ku biireen Lybrand, Ross Brothers & Montgomery ee Mareykanka
Coopers & Lybrand Deloitte