Groupe IDI activity is divided in two areas: through its subsidiaries, EURIDI and Marco Polo Investissements, Co. is engaged in management buy-out/buy-in and growth capital investments in French small-mid caps valued between Euro7,000,000 and Euro75,000,000 also, through its subsidiary, IDI Mezzanine, is engaged in mezzanine financing. Also Co. is active in the purchase of secondary market portfolio.

Jenoptik is a holding company. Through its subsidiaries, Co. is an optoelectronics group engaged in the production of range of products including original equipment manufacturer or standard components, modules and subsystems through to systems and production lines for numerous sectors. Co.'s operating business is organized in the following three operating segments: Laser & Optical Systems, Metrology, and Defense & Civil Systems. The operating business within the segments is further subdivided into five divisions: Lasers & Material Processing, Optical Systems, Industrial Metrology, Traffic Solutions, and Defense & Civil Systems, each of which are subdivided into several business units.

ProSiebenSat.1 Media is a holding company engaged as a media corporations in Europe, with TV stations in Germany, Austria and Switzerland. Co.'s core business consists of free TV financed by advertising. Co. also owns an international production network along with digital and ventures portfolio. In addition, Co. is engaged as online seller of video content on the internet. Also, Co. is involved in the online games business and operates an e-commerce portfolio. Through its Red Arrow Entertainment Group, Co. produces international TV programs and sells them to TV stations worldwide. Co. has three segments: Broadcasting German-speaking, Digital & Adjacent and Content Production & Global Sales.