| Slovalco a.s. | Assembly and services of the walls in electrolysers, smelting stabilisation, induction ovens, calcining ovens, pans, refiners, chutes |
| Nemak Slovakia s.r.o. | Service of the walls in shaft furnaces, smelting furnaces, pans |
| Fagor Ederlan Slovensko a.s. | Service of the walls in shaft furnaces and feed furnaces, pans |
| Schüle Slovakia s.r.o. | Service of the walls in shaft furnaces and feed furnaces |
| Illichman Castaloy s.r.o. | Service of the walls in shaft furnaces, smelting furnaces, pans |
| Mops Press s.r.o. | Service of the walls in the shaft and feed furnaces, pans |
| Brembo Czech s.r.o. | Service of the walls in the shaft, induction and feed furnaces, pans |
| Confal a.s. | Service of the walls in the smelting, rotating and stabilisation furnaces, chutes |
| Remet s.r.o. | Service of the walls in the smelting, rotating and stabilisation furnaces |
| EMDS bvba | Locksmith, welding and maintenance work on concrete plant equipment |
| Refratechnik Steel GmbH | Assembly and service of the walls in the rotating and smelting furnaces |
| ZLH Plus, a.s. | Service of the cupola furnace and the area in front of the furnace |
| Joseph Egli AG. Incineration Plants | Assembly of the walls in the combustion chambers |
| Veolia Utilities Žiar nad Hronom, a.s. | Service of the drum walls |
| Gremi Klima s.r.o. | Assembly and service of the drum walls |
| Calderys Deutschland GmbH | Assembly of the walls in the smelting furnace, service of the rotating furnace and the area in front of the furnace |
| Tessenderlo Kerley Ham | Installation and servicing of linings damping furnaces |
| Maintenantz BVBA | Production and assembly of industrial constructions, maintenance, timbering works – production of the concrete moulds |
| Bertbouw BVBA | Building jobs |
