| Company name | Reg. code |
|---|---|
| PRK CONSULTING OÜ | 16946877 |
| PARK CONSULTING OÜ | 11499281 |
| RAND HYDROGEN OÜ (former name PRH Consulting OÜ) | 12979667 |
| ATRK ENTREPRENAD OÜ kustutatud (former name Alex & RK Consulting OÜ) | 12894451 |
| COMPOTEXA OÜ kustutatud (former name B1.lt OÜ) | 14444108 |