Ammann Group Holding AG is a Swiss mechanical engineering company specialised on machines for the building industry and road construction.As of 2012, the company employs a workforce of about 3,400, generating a revenue of CHF 960 million. It is incorporated in Bern, but its offices are located in Langenthal (canton of Bern).The company is a family business founded in 1869 by Jakob Ammann. Ammann developed an internal-combustion powered Road roller in 1911.