| Company name | Reg. code |
|---|---|
| TERWROX OÜ (former name KM ärid OÜ) | 14089417 |
| TERATOX OÜ kustutatud (former name Teratox UÜ) | 14329726 |
| TERROL OÜ | 12185884 |
| TERMOX OÜ (former name Aktsiaselts TERMOX) | 10084446 |
| TERRAX VARUMINE OÜ | 10942890 |
| TERMOX INVEST OÜ kustutatud | 14248330 |
| TERRO TRANSPORT OÜ | 12647675 |
| TEROX SOLUTIONS OÜ (former name Terox Solutions UÜ) | 14432757 |
| TORROX OÜ | 11386818 |
| TEHROX OÜ (former name Kop-Tech OÜ) | 16000752 |
| SERWOX OÜ | 12131090 |
| FERROX ELECTRIC OÜ kustutatud | 12325902 |
| FERROX EST OÜ | 10887323 |
| FERROX SOLAR OÜ kustutatud | 14558728 |
| FERROX POWER OÜ | 16601374 |
| HIGHKOALA OÜ kustutatud (former name Black Terror OÜ) | 16291040 |