References
| Syndial SpA | Porto Torres |
| Enichem SpA | Porto Torres |
| Enichem SpA | Ottana |
| Enichem SpA | Assemini |
| Polimeri Europa SpA | Porto Torres |
| Polimeri Europa SpA | Sarroch |
| Enirisorse SpA | Portovesme San Gavino |
| Industrial Minerals Group SpA | Novara |
| Inca International SpA | Ottana |
| Montefibre Ltd. | Ottana |
| Sardasilicati SpA | Bones - Florinas |
| Snamprogetti SpA | Milan |
| Tecnimont SpA | Milan |
| Vesuvius Italy SpA | Assemini |
| ING. Louis Contivecchi SpA | Assemini |