| Company name | Reg. code |
|---|---|
| HPROOF OÜ (former name WaterReserve OÜ) | 16316410 |
| JPROOF OÜ | 14333248 |
| PROOF OÜ kustutatud | 10508248 |
| BPROOF SYSTEMS OÜ | 17380981 |
| PROOF AGENCY OÜ | 16481800 |
| PROOF EUROPE OÜ kustutatud | 12295549 |
| FIRE PROOF OÜ | 11380253 |
| IPROFF OÜ | 14482882 |
| MHPROFF OÜ | 17232813 |
| MYROOF OÜ | 16910201 |
| MMROOF OÜ kustutatud | 12361186 |
| BPROFF OÜ | 12905545 |
| TOPROOF OÜ | 14815869 |
| EPROFF OÜ kustutatud | 12404843 |
| EPROFF OÜ | 16238465 |
| PROON OÜ kustutatud (former name DemanDay OÜ) | 14638433 |
| 1PROFF OÜ | 16789840 |
| PROFF OÜ | 16167216 |
| IROOF OÜ | 16030799 |
| PROFF24 OÜ | 16713920 |
| CROOF OÜ | 14734444 |
| PRÖÖM OÜ | 14416075 |
| FUTURE PROOF TECHNOLOGY OÜ | 16212862 |
| PROOF COMFORT GROUP OÜ | 14256045 |
| ABDULLAH HAROON OÜ (former name MOTORZ OÜ) | 12924407 |
| EPROFF KONSULT OÜ kustutatud | 12167343 |
| AMV PROFF OÜ kustutatud | 11198086 |
| PRÖÖM HOLDING OÜ | 16652963 |
| PERNAU PROFF OÜ | 11282496 |
| PÕRANDA PROFF OÜ | 17135170 |
| PROFF TRANSVER OÜ | 17128098 |
| PROOS INVEST OÜ | 11225819 |
| HOROO DUUREG OÜ (former name Ketprojekt OÜ) | 14102454 |
| VALU PROFF OÜ | 16115403 |
| AVERON PROFF OÜ (former name Averon Proff UÜ) | 14141218 |
| SÜLEARVUTI PROFF OÜ kustutatud | 10304347 |
| BDN PROFF OÜ | 12826426 |
| SHANDOR-PROFF OÜ kustutatud | 14276125 |
| PG PROFF OÜ kustutatud | 11361273 |
| PROFIIL PROFF OÜ | 10786817 |
| WIRU PROFF OÜ kustutatud | 12089063 |
| KITCHEN PROFF OÜ | 14738689 |
| PROFF PRAKTIK OÜ | 12155535 |
| FORREST PROFF OÜ | 17476623 |
| PROFF-DESIGN OÜ | 14388479 |
| KOSMO PROFF OÜ | 11911360 |
| AH PROFF OÜ kustutatud | 10167706 |
| VERNER PROFF OÜ | 12922420 |
| ABC PROFF OÜ kustutatud | 11267597 |
| AASJA PROFF OÜ kustutatud (former name Norden Proff OÜ) | 14125395 |