| Company name | Reg. code |
|---|---|
| SATRONEL OÜ (former name Satron Electronics OÜ) | 12152809 |
| SATRON RD OÜ | 10757477 |
| SATRON MEDICAL OÜ | 14956624 |
| SAPRONEN OÜ | 10664066 |
| BATRONEX OÜ | 14948263 |
| ASTROTEL OÜ | 11257831 |
| ASTRONEK OÜ (former name Astronek UÜ) | 14483976 |
| STRONGEL OÜ kustutatud | 12232520 |
| STARONE OÜ | 17414415 |
| STRONEX OÜ | 17457198 |
| TRONEL OÜ | 10057403 |
| SAPRONEN INVESTEERINGUD OÜ | 17463678 |
| SAPRONEN VARAD OÜ | 17425131 |
| Sapronen varad OÜ (asutamisel) (former name NORRE OÜ (asutamisel)) | - |