ACS Actividades de Construccion y Servicios is a holding company. Through its subsidiaries, Co.'s activities are divided into the following areas: Construction, engaged in the construction of civil works, and residential and non-residential building construction; industrial services, engaged in the development of applied engineering services, installations and the maintenance of industrial infrastructures in the energy, communications and control systems sectors; services, groups together environmental services, the outsourcing of building maintenance services, logistics and transport services; and concessions, mainly engaged in transport infrastructure concessions.

Hochtief is a holding company. Through its subsidiaries, Co. operates as a construction company engaged in projects in the transportation, energy, and social and urban infrastructure sectors as well as contract mining. Co. provides its services through three divisions: HOCHTIEF Americas, which encompasses the construction activities of operational units in the U.S and Canada; HOCHTIEF Asia Pacific, which includes the construction activities and contract mining in the Asia-Pacific region; and HOCHTIEF Europe, which designs, develops, builds, operates, and manages real estate and infrastructure, with primary business in Europe as well as selected other regions.