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).

Savencia is a transformer of milk centered on cheese, dairy specialties, and on dairy ingredients. Co.'s operations are divided into two segments: the Cheese Products segment and the Other Dairy Products segment. In the Cheese Products segment, Co. manufactures and distributes cheeses and cheese specialties. In the Other Dairy Products segment, Co. manufactures and distributes modern butters and long-life creams both for final consumers and professional users, manufactures technical butters and specialized dairy proteins for industrial markets, and manufactures aseptically packaged products.

Siltronic AG is a Germany-based producer of hyperpure silicon wafers. The Company offers polished wafers, epitaxial wafers and annealed wafers, among others. Its products are used for semiconductor components, including high-voltage applications, low resistivity devices in automotive engineering and telecommunications, as well as integrated microprocessors and memory modules for information processing in cell phones, laptops and other consumer goods. The Company also produces high reflectivity (HiREF) wafers, as well as PowerFZ wafers for power applications and Ultimate Silicon for complementary metal-oxide semiconductor (CMOS) applications. It operates production facilities in Europe, Asia and the United States.

Stadler Rail AG is a Switzerland-based company engaged in design and manufacturing of rail vehicles. The Company's product portfolio includes suburban and regional transport trains, light rail vehicles, trams, high-speed and intercity trains, city transport vehicles, locomotives, passenger trains and tailor-made vehicles. The Company serves customers worldwide.