| Company name | Reg. code |
|---|---|
| OPENKO OÜ kustutatud | 10401438 |
| OPENVOX OÜ (former name CrayonPanda Digital Studio OÜ) | 14461868 |
| OPENLY OÜ kustutatud | 14410486 |
| OPENIQ OÜ | 14656827 |
| OPENX OÜ | 16112451 |
| HEART OPENER BRAND OÜ | 17382282 |
| OPEKS A.R. OÜ kustutatud | 10193046 |
| OPENSKY CONSULT AND TRADING OÜ | 14112547 |
| UPENDO OÜ kustutatud | 12891458 |
| OVENTO OÜ | 17364901 |
| SVENKO OÜ | 12168220 |
| TOLPENKO OÜ | 16607916 |
| ODENSO OÜ | 14234262 |
| OSINKO OÜ | 12841207 |
| MENKO OÜ | 16104629 |
| DENKO OÜ | 14988966 |
| OMEKO OÜ kustutatud | 10790865 |
| ÕLEKO OÜ | 10260854 |
| GORENKO CORP OÜ | 16616358 |
| OLENKA COACHING OÜ | 16320801 |
| OPINIO FINANCE OÜ | 12837016 |
| ORENTO SERVICE OÜ (former name Orento Service UÜ) | 14729963 |
| OVENCO GENERAL OÜ kustutatud | 14537181 |
| KOTENKO PUHASTUS OÜ | 16724875 |
| STENKO EHITUS OÜ | 16850083 |
| GENKO GLOBAL OÜ kustutatud | 12618484 |
| DOCTORBIS KENKO OÜ | 17223626 |
| DENKO OPTIES OÜ kustutatud | 10766571 |
| KENKO VARAD OÜ | 17223922 |
| HENKO LAHENDUS OÜ | 17174218 |
| KENKO CURRENT OÜ | 16837467 |
| OPEN MIND CLUB OÜ (former name OÜ Open Mind Huvikool) | 14257470 |
| UNIT HOLDINGS OÜ (former name Open Travel Market OÜ) | 16869881 |
| SYEDNA HAKIMUDDIN OÜ kustutatud (former name EHRE OÜ) | 12228211 |
| OPEN SHORELINE OÜ | 16769808 |
| OPEN24.EE OÜ kustutatud | 12438055 |
| OPEN GATE OÜ | 16723806 |
| CLUB OPEN OÜ | 10774085 |
| OPEN HOLDINGS OÜ kustutatud | 11418375 |
| OPEN INVESTMENTS OÜ kustutatud | 11356355 |
| OPEN EXPORT OÜ | 12817155 |
| OPEN PRESS OÜ kustutatud | 14272564 |
| OPEN OCEAN OÜ | 17444327 |
| OPEN SKY OÜ (former name North Sky OÜ) | 14048097 |
| OPEN EMDR OÜ | 17209030 |
| OPEN COAST OÜ kustutatud | 16343162 |
| OPEN GROUP OÜ kustutatud | 14894900 |
| OPEN MEDIA OÜ | 12459152 |
| OPEN LABS OÜ | 12982342 |
| OPEN RELATIONS OÜ kustutatud | 11278514 |