| Company name | Reg. code |
|---|---|
| TESMASAN OÜ | 10321573 |
| TESMAN OÜ (former name aktsiaselts Tesman) | 10275264 |
| TESMAN PROJEKT OÜ kustutatud (former name Ökoarendus OÜ) | 16271238 |
| TESMAN EHITUS OÜ | 14187812 |
| TESMAN HALDUS OÜ (former name Mameto Holding OÜ) | 14366064 |
| TELVASAN OÜ | 17428972 |