| Company name | Reg. code |
|---|---|
| MARDUS HOLDING OÜ | 16091849 |
| MARCUS HOLDING OÜ | 10265805 |
| KALMAR HOLDING OÜ (former name OÜ Milius Holding) | 14232027 |
| HOSTING HALDUS OÜ | 17434636 |
| HK MANAGEMENT OÜ (former name H.E.M Holding OÜ) | 16172619 |
| Litegrav Bio Holdings OÜ (former name Dersan Holding OÜ) | (asutamisel) |
| EESTI HARIDUS- JA MAJANDUSTEADUSTE AKADEEMIA OÜ (former name Baltic Holdings Group OÜ) | 12511355 |