| Company name | Reg. code |
|---|---|
| PROTEJA OÜ | 16588024 |
| PROTERA GRUPP OÜ (former name Protera Grupp UÜ) | 12856309 |
| PROTEA INVEST OÜ | 14216235 |
| PROMELA OÜ | 10613784 |
| PROTEGE OÜ kustutatud | 11958864 |
| PROTERRA OÜ kustutatud (former name IWENTO OÜ) | 14565792 |
| PROTEMAL OÜ | 10912305 |
| PROTECH OÜ | 14667142 |
| PROOTEA OÜ | 17331505 |
| PROTOLA OÜ | 16420052 |
| PROMEDA OÜ | 11047097 |
| PROTERO OÜ (former name Protero UÜ) | 12978260 |
| PROGEJAD OÜ | 10533677 |
| PROTEXX OÜ kustutatud | 12241476 |
| PROTEAM OÜ | 10995780 |
| PROTEUS OÜ | 10459892 |
| PROMETA OÜ | 12333439 |
| PROMEGA OÜ | 11055626 |
| PROTRENA OÜ | 11059350 |
| PRODEFA OÜ kustutatud | 12099771 |
| PROTEKO OÜ kustutatud | 12365343 |
| PROTEST OÜ | 17026475 |
| PROTEK OÜ | 10847192 |
| PROTEO OÜ | 16824714 |
| PROSEA OÜ | 11501828 |
| PROTEM OÜ | 16455079 |
| BALTIC PROTEAM OÜ | 16573689 |
| PROTEUS CONSULT OÜ | 16355337 |
| PROTECH FISHER OÜ kustutatud (former name Kalanduse Toetusjuht OÜ) | 12225543 |
| PROTECO SERVICES OÜ | 16416613 |
| PROTECT ESTONIA OÜ | 14929455 |
| PROMESA INVEST OÜ kustutatud | 11424938 |
| PERFECT PROTEIN OÜ | 17098658 |
| PROTOLA GROUP OÜ (former name Toppet OÜ) | 14894840 |
| PROTEIN BYPRODUCTS OÜ kustutatud | 12650499 |
| HEALTHY PROTEIN OÜ | 16854566 |
| PROTEIN ENERGY OÜ | 16578907 |
| SOLID PROTECT OÜ | 16851651 |
| PROTEAC MWAYSENI OÜ kustutatud | 12780701 |
| SHINE & PROTECT OÜ | 17142974 |
| PROTEIN GROUP OÜ | 12452902 |
| PROCESSED PROTEIN OÜ kustutatud | 12794821 |
| PROTEAM SYSTEMS OÜ | 11644700 |
| PROMENA BALTIC OÜ | 12243073 |
| PROPERA PARADA OÜ | 16998093 |
| PROTECH STEEL OÜ kustutatud | 12203547 |
| PROTECH PLUS OÜ | 17146274 |
| PROTEGO CONSULTING OÜ | 14777666 |
| PROTEIN INDUSTRY OÜ kustutatud | 12860831 |
| MULTI PROTECT OÜ | 11484053 |