| Company name | Reg. code |
|---|---|
| QUESTALL OÜ (former name Questall UÜ) | 12947644 |
| QUESTALL GROUP OÜ (former name Questall Group UÜ) | 14347150 |
| QUESTALL CAPITAL OÜ kustutatud (former name Questall Capital UÜ) | 12947673 |
| NORD TAK & BYGG TEKNIK OÜ (former name Questall Group OÜ) | 14065842 |
| WINEBUDDI OÜ (former name Questall Service OÜ) | 14076337 |
| QUESTANO OÜ | 16466172 |
| QUESTART OÜ | 14650115 |
| QUESTEL OÜ kustutatud | 10539088 |
| QUESTLY OÜ | 17432175 |
| QUESTAE OÜ | 14987257 |
| QMETALL OÜ | 16326962 |
| LESTALL OÜ | 16662571 |