| Company name | Reg. code |
|---|---|
| PROTEUS OÜ | 10459892 |
| PROTEUS CONSULT OÜ | 16355337 |
| PROTEGE OÜ kustutatud | 11958864 |
| PROTSESS OÜ | 10430539 |
| PROKEYS OÜ kustutatud | 12428698 |
| PROTECH OÜ | 14667142 |
| PROTEJA OÜ | 16588024 |
| PROMETS OÜ | 12098056 |
| PROTEXIUS OÜ | 17400815 |
| PROTERO OÜ (former name Protero UÜ) | 12978260 |
| PROTONS OÜ | 14730423 |
| PROTEXX OÜ kustutatud | 12241476 |
| PROWESS OÜ | 11237708 |
| PROTEAM OÜ | 10995780 |
| PROFOUS OÜ | 10465757 |
| PROPESU OÜ | 16447022 |
| PROLENS OÜ | 17012970 |
| PROTUUR OÜ kustutatud | 16051927 |
| PROTEKO OÜ kustutatud | 12365343 |
| PROVIUS OÜ kustutatud | 12106287 |
| PROTEST OÜ | 17026475 |
| PROBUS OÜ | 10655707 |
| BALTIC PROTEAM OÜ | 16573689 |
| PROTECH FISHER OÜ kustutatud (former name Kalanduse Toetusjuht OÜ) | 12225543 |
| PROTECO SERVICES OÜ | 16416613 |
| PROTECT ESTONIA OÜ | 14929455 |
| PERFECT PROTEIN OÜ | 17098658 |
| TECHCAPITAL PROCESS OÜ kustutatud | 14399603 |
| PROCESS OPTIMA OÜ | 12604387 |
| PROTEIN BYPRODUCTS OÜ kustutatud | 12650499 |
| HEALTHY PROTEIN OÜ | 16854566 |
| MARKETING PROCESS OÜ | 17234891 |
| PROTEIN ENERGY OÜ | 16578907 |
| SOLID PROTECT OÜ | 16851651 |
| PROCERUS INVEST OÜ (former name EP Industries OÜ) | 11696973 |
| PROTEAC MWAYSENI OÜ kustutatud | 12780701 |
| SHINE & PROTECT OÜ | 17142974 |
| PROCESS DESIGN OÜ | 12034458 |
| PROTEIN GROUP OÜ | 12452902 |
| PROCESSED PROTEIN OÜ kustutatud | 12794821 |
| PROTEAM SYSTEMS OÜ | 11644700 |
| PROTECH STEEL OÜ kustutatud | 12203547 |
| RATIONAL PROCESS OÜ kustutatud | 14423951 |
| PROMETEUS LABS OÜ (former name Novaholding OÜ) | 14381052 |
| PROTECH PLUS OÜ | 17146274 |
| PROCESS MATERIALS OÜ | 17402197 |
| PROTEGO CONSULTING OÜ | 14777666 |
| PROMETEUS EUROPE OÜ | 17357516 |
| PROTEIN INDUSTRY OÜ kustutatud | 12860831 |
| MULTI PROTECT OÜ | 11484053 |