| Company name | Reg. code |
|---|---|
| SERRUS UÜ | 17083941 |
| L.SERVIS UÜ | 11849023 |
| SERRE OÜ (former name Serre UÜ) | 14095079 |
| SEREKS TRADE OÜ (former name Sereks Trade UÜ) | 14164768 |
| SERTES VIIMISTLUS OÜ kustutatud (former name Sertes Viimistlus UÜ) | 14654538 |
| SIRIUS DEVELOPMENT OÜ kustutatud (former name Sirius Development UÜ) | 14890730 |
| ANDAN OÜ (former name Sarres Teenus UÜ) | 12993526 |