| Company name | Reg. code |
|---|---|
| TTR MTÜ | 80634954 |
| MTR OÜ | 12133864 |
| TTG VILISTLASORKESTER MTÜ | 80313983 |
| TRT MOTORSPORT MTÜ (former name MTÜ Tiits Racing Team) | 80575536 |
| TOR BRUGGEN MTÜ | 80585049 |
| SPORDIKLUBI TRT77 MTÜ | 80418788 |
| BTR RACING MTÜ (former name Bionic Transport Racing MTÜ) | 80396288 |
| MTR MARINE OÜ | 14002132 |
| MTR HOLDING OÜ | 12356156 |
| MTR KINNISVARABÜROO OÜ | 11346167 |
| MTR EKSPERT OÜ | 12532506 |
| MTR-PALVELUT OÜ kustutatud | 12308275 |
| MTR TEENUSED OÜ | 11370898 |
| MTR SOFTWARE OÜ kustutatud | 12986940 |
| MTR PAINT OÜ | 12448311 |
| METALL MTR OÜ kustutatud | 12229794 |
| MTR ARENDUS OÜ | 12246338 |
| MTR GRUPP OÜ | 14524994 |
| MTR AUTOMATION OÜ | 10854231 |
| MTR PROPERTIES OÜ kustutatud | 11248855 |
| MTR HALDUSE OÜ | 12249549 |
| MTR ENGINEERING OÜ | 12158982 |
| MTR TEED OÜ kustutatud | 11267500 |
| TALTECH TURUNDUSKLUBI MTÜ (former name MTÜ TTÜ Turundusklubi) | 80407508 |
| MTR REAL ESTATE OÜ kustutatud | 12384342 |
| MTR CAR TRADING & SERVICE OÜ kustutatud (former name MTR CAR TRADING OÜ) | 12900401 |
| ESTONIAN HORSETHERAPY MTÜ kustutatud (former name MTÜ TTL Stables) | 80571455 |
| TALTECH AUTOSPORDIKLUBI MTÜ (former name TTÜ Autospordiklubi) | 80407974 |
| TALTECH KULTUURIKLUBI MTÜ (former name TTÜ Kultuuriklubi) | 80211403 |
| ROBOTIKLUBI MTÜ (former name Mittetulundusühing TTÜ Robotiklubi) | 80234864 |
| TARKÜS MTÜ (former name Mittetulundusühing TTÜ TarKÜN) | 80352167 |