| Ettevõtte nimi | Reg. kood |
|---|---|
| HYDROGEN OÜ kustutatud | 11357490 |
| VIRU HYDROGEN OÜ | 16133648 |
| RAND HYDROGEN OÜ (endine nimi PRH Consulting OÜ) | 12979667 |
| GREEN HYDROGEN OÜ kustutatud | 16127814 |
| SPIRAL HYDROGEN OÜ (endine nimi Volcanoprint OÜ) | 16896381 |
| HYDROGEN ENERGY OÜ (endine nimi Parkpharma OÜ) | 16015469 |
| HYDROGEN HEATING OÜ kustutatud | 12817663 |
| STARGATE HYDROGEN OÜ | 16191501 |
| HYDROGEN CONSULTING OÜ kustutatud | 12023319 |
| SUSTAINABLE HYDROGEN OÜ | 16598494 |
| STARGATE HYDROGEN SOLUTIONS OÜ | 16193521 |
| ESTONIAN HYDROGEN ENERGY SCIENTIFIC RESEARCH AND PRODUCTION CENTRE OÜ kustutatud | 16186702 |
| HYDRAGEN OÜ | 17027351 |
| HYDROVER OÜ | 10813365 |
| HANROGEN OÜ | 11148450 |
| CORESTONE R&D OÜ kustutatud (endine nimi OÜ Hydrogenatio R&D) | 12680632 |
| TMV DIHYDROGEN ENTERPRISES OÜ kustutatud (endine nimi Fx Vitality Lifestyle OÜ) | 16173375 |