| Company name | Reg. code |
|---|---|
| FIERO OÜ | 12892914 |
| FIERO AUTO OÜ kustutatud | 10519312 |
| FIENO OÜ | 17115747 |
| FIERA DI INFORMATICA OÜ | 14009039 |
| FAERO OÜ | 16526572 |
| FITRO OÜ | 14956848 |
| FERO OÜ | 14081309 |
| FINERO SOLUTIONS OÜ | 17232708 |
| FIKERO GRUPP OÜ (former name Fikero Grupp UÜ) | 12999546 |
| FERO INVESTMENT OÜ kustutatud | 12127591 |
| FERO INVEST OÜ (former name OÜ Pumalanga) | 11508842 |
| DUAZON MIABLI OÜ kustutatud (former name Fidero Trading OÜ) | 12759463 |