| Company name | Reg. code |
|---|---|
| HELTRONES OÜ | 17180970 |
| HELTONEN OÜ (former name Heltonen UÜ) | 12966943 |
| HELTONEN CONSTRUCTION OÜ kustutatud (former name House Property OÜ) | 14861763 |
| ELTRONEX OÜ | 14483433 |
| ELRONES OÜ | 11736321 |
| NYALL UKUNDA OÜ kustutatud (former name Beltronex OÜ) | 12872857 |