| Company name | Reg. code |
|---|---|
| INVEST HS OÜ kustutatud | 16607508 |
| EST-INVENT HS OÜ kustutatud | 10218556 |
| HSC INVEST OÜ | 17231850 |
| HSP INVEST OÜ (former name Helus OÜ) | 14543649 |
| HSLT INVEST OÜ | 16558939 |
| HS INVESTEERINGUD OÜ | 16202183 |
| HS COPPER INVESTMENT OÜ | 17253705 |
| ELECTRICAL SUPPORT OÜ (former name HSA Invest OÜ) | 16669389 |