| Company name | Reg. code |
|---|---|
| HLK HOLDING OÜ | 17475227 |
| ELK HOLDING OÜ kustutatud | 14866306 |
| HLL HOLDING OÜ | 11933901 |
| KLK HOLDINGS OÜ | 17019587 |
| STARTECH SERVICE OÜ kustutatud (former name LK-Welding OÜ) | 14085661 |
| MQQA04 HOLDING OÜ (former name HLG70 Holding OÜ) | 16057611 |