Proximus supplies integrated telecommunications services on the Belgian market. Co.'s activities are divided into four segments: Consumer Business Unit (CBU), which sells voice products and services, internet and television, on fixed and mobile networks, to residential customers; Enterprise Business Unit (EBU), which caters to professional customers; Service Delivery Engine and Wholesale, which centralizes all the network and IT services and costs, provides services to CBU and EBU and sells these services to other telecom and cable operators; and International Carrier Services, which focuses on international carrier activities.

Solvac is a holding company. Through its subsidiary, Solvay, Co. is active in Chemistry. Co. manufactures and sells chemicals and plastics products. Its operations can be divided into two business segments: Chemicals and Plastics. In the Chemicals Sector, Co.'s produts are divided into four clusters which are the Minerals cluster; the Electrochemistry and Fluorinated Products cluster; the Oxygen cluster; and the Organic cluster. In the Plastics sector, Co.'s products can be divided into 2 different clusters which are Specialties and Vinyls. The Specialties cluster comprises Specialty polymers and Inergy Automotive Systems. The Vinyls cluster comprises Vinyls and Pipelife.