Alten is a holding company. Through its subsidiaries, Co. operates in three areas: Engineering and Technology Consulting (ETC), Telecoms Networks and Multimedia, and Information Systems (NTIS). Through the Engineering and Technology Consulting (ETC) segment, Co. studies and designs technology products for technical divisions in industry and telecoms. The Telecoms Networks and Multimedia segment focuses on Product design, Architecture, deployment, and operation of networks. Lastly, the IT systems segment comprises Applications and software development, and Infrastructure and Telecoms (Applications, systems and networks Corporate telecommunications).

Sopra Steria Group is a global player in IT services, with operations in consulting, software development, and integration. In addition to France, Co. operates in the United Kingdom, Spain, Italy, Switzerland, Germany, and Belgium, assisting its clients in managing the transformation of their businesses and information systems. Co. divides its operation into three categories: Consulting, Systems and Solutions Integration, and Software Development; which it spreads among eight major verticals: Financial Services, Insurance and Social Welfare, Public Sector, Telecom Operators, Aerospace and Defense, Energy, Transport and Courier Services, and Retail.