| Company name | Reg. code |
|---|---|
| FILTER HOLDING OÜ kustutatud | 16100459 |
| FILTER SOLUTIONS OÜ (former name Filter Holding OÜ) | 14532752 |
| FILTRO HOLDINGS OÜ | 17301763 |
| FILKEM GRUPP HOLDING OÜ | 16600512 |
| ROBAT MAHELA OÜ kustutatud (former name Alter Holding OÜ) | 14065919 |
| KALMAR HOLDING OÜ (former name OÜ Milius Holding) | 14232027 |