| Company name | Reg. code |
|---|---|
| PROJ4 OÜ | 14604612 |
| PROJ 1XO OÜ | 16756835 |
| PRÕN-PRÕN-PRÕN OÜ | 17481297 |
| MHS PRO OÜ (former name MHS Projekteerimine OÜ) | 12748583 |
| PROV OÜ | 14171751 |
| PROM OÜ | 14318272 |
| PROK OÜ | 14514748 |
| PROP OÜ | 14250675 |
| PRO-KIVI PROJEKT OÜ kustutatud | 16081265 |
| PRO123 OÜ kustutatud | 16376753 |
| PRO100 OÜ kustutatud | 12417917 |
| PRO3 OÜ | 16417937 |
| PRO24 OÜ | 17286992 |
| PRO2 OÜ kustutatud | 17242575 |
| 5+PRO OÜ (former name 5+pro UÜ) | 16411082 |
| 100PRO OÜ | 14972008 |
| PRO13 OÜ | 14846195 |
| PROD IMPCT OÜ | 16392114 |
| PROL & BARDIKOS OÜ kustutatud (former name Bprol OÜ) | 14867932 |
| CADEST PROF OÜ | 11419185 |
| LR PROF OÜ | 14178761 |
| PROP FINANCE OÜ | 16269394 |
| PROF UNIT OÜ | 17333378 |
| REMOTE PROS OÜ kustutatud | 16205618 |
| PROV RENT OÜ | 16785115 |
| MILDAN PROF OÜ | 10562182 |
| SMARTLIFE PROD OÜ | 14608082 |
| PROF PLUS OÜ | 10158593 |
| PROW LOGISTICS OÜ | 16699367 |
| CLEAR PROP OÜ | 16096887 |
| PROP AIR OÜ | 12622439 |
| NORDEST PROF OÜ kustutatud | 10894464 |
| BALTIK PROM OÜ | 10877320 |
| EVERET PROF OÜ (former name Everet Prof UÜ) | 14040457 |
| KMG PROF OÜ | 11141092 |
| IMEX-PROM OÜ kustutatud | 11367318 |
| ELMAN PROF OÜ | 12611051 |
| VVO PROM OÜ | 14917110 |
| SASHA PROF OÜ | 17206316 |
| COOLING PROF OÜ (former name KS PUTKITUS OÜ) | 14979111 |
| INFINITUS PROF OÜ | 17457548 |
| MR-PROD OÜ | 12898561 |
| SR PROT OÜ kustutatud | 10211198 |
| ORGANIC-PROB OÜ kustutatud (former name OpenBay OÜ) | 12747721 |
| PROF PUHASTUS OÜ | 14369499 |
| PROT TECHNOLOGY OÜ kustutatud | 14678473 |
| DS PROD OÜ | 14432200 |
| BAUVO PROF OÜ | 16727112 |
| BALTKAPITAL PROF OÜ kustutatud | 10879973 |
| PROF KOSMEETIKA OÜ kustutatud | 11367666 |