12 operating companies refer to the Holding Manni Group. They operate in three different business units to produce, process and market products featuring high technology and advanced design:

ManniSipre and its subsidiary Manni Inox and Manni Green tech

Insulating panels 
Isopan and its subsidiaries IsopanIberica, IsopanEst, Isopan Deutschland, IsopanRus, the Mexican Isocindu and the sales companies Isopan France and Isopan Manni Group CZ

Renewable energy and services supporting the Holding and its subsidiaries MANNI ENERGY, ICOM Engineering, Manni Immobilia.