| Company name | Reg. code |
|---|---|
| UESOON UÜ | 11916222 |
| VESRON TRADE OÜ (former name Vesron Trade UÜ) | 16722942 |
| ESRON GROUP OÜ (former name Esron Group UÜ) | 16771320 |
| PARKERS OÜ kustutatud (former name Reson Kaup UÜ) | 14702770 |
| KUKERPUU KINNISVARA OÜ (former name ESTON ENERGY UÜ) | 12905686 |
| DESON TRADE OÜ kustutatud (former name Deson Trade UÜ) | 16076927 |
| AMRUTA OÜ (former name Esron Hooldus UÜ) | 16580695 |
| RESON VIIMISTLUS OÜ (former name Reson Viimistlus UÜ) | 14092448 |
| ESRON HALDUS OÜ (former name Esron Haldus UÜ) | 16656174 |
| KAKUVERE LAANED & PÕLLUD UÜ (former name Prolet UÜ) | 12950505 |
| EUROBALT PAREMABI OÜ (former name Feston Service UÜ) | 16000143 |