| Company name | Reg. code |
|---|---|
| PROAMON OÜ | 14926267 |
| PROCYON OÜ | 16274662 |
| PROOTON OÜ kustutatud | 12974405 |
| PROAKEN OÜ kustutatud | 14134187 |
| PROKAMIN OÜ | 17038923 |
| PROFMOD OÜ | 14654337 |
| PROMAKON OÜ | 10749880 |
| PROARCON OÜ kustutatud | 12605694 |
| PROTRÖN OÜ | 16593249 |
| PROPMAN OÜ | 16704329 |
| PROSKON OÜ | 11365992 |
| PROOTON OÜ kustutatud | 12297057 |
| PROSALON OÜ | 14684611 |
| PROTAGON OÜ | 11187065 |
| PROCON OÜ | 12799289 |
| PROMOP OÜ | 16773307 |
| PROMAN OÜ | 10180517 |
| PROMIN OÜ | 16555852 |
| JÜRI PROMANN OÜ | 11535514 |
| PROCYON INTEGRATIONS OÜ | 14639728 |
| PROFMAN SEA OÜ | 12447516 |
| TALLINN PROTOON OÜ | 12515413 |
| PROOTON AB OÜ | 12233407 |
| PROMANO EST OÜ kustutatud | 11681888 |
| PROXION INFRASTRUCTURE OÜ | 17468865 |
| PROON OÜ kustutatud (former name DemanDay OÜ) | 14638433 |
| PROMO OÜ | 10802812 |
| PROCON BALTIC OÜ | 17314346 |
| PROKON PROJEKT OÜ | 12317788 |
| PROTON INVEST OÜ kustutatud | 11968897 |
| PROKON INVEST OÜ | 16833280 |
| PROCON SLS OÜ | 14572065 |
| PROMEN BALTICS OÜ kustutatud | 11884953 |
| PROCON SERVICE OÜ | 12043428 |
| PROTON ONE OÜ | 10722220 |
| PROCON CONSULTS OÜ kustutatud | 11400895 |
| PROCON TEAM OÜ kustutatud | 12148877 |
| PROCON MEDICAL OÜ (former name Epura OÜ) | 11071397 |
| VIDEO PROTON OÜ | 14593452 |
| PROMAN ESTLAND OÜ | 16853532 |
| PROXION PLAN ESTONIA OÜ kustutatud (former name Proxion Estonia OÜ) | 16063244 |
| UBC PROMO OÜ | 12104503 |
| PRO PROMO OÜ | 12644027 |
| .PROMO INTERNATIONAL OÜ kustutatud | 12085800 |
| PROMO LABORATORY OÜ | 14064015 |
| PROMO-TEAM OÜ kustutatud | 12368946 |
| FIRST PROMO OÜ | 12098961 |
| SOCIAL PROMO OÜ | 16328174 |
| AFY PROMO OÜ | 17385174 |
| IMPERIUM PROMO OÜ kustutatud | 17216916 |