| Company name | Reg. code |
|---|---|
| RO OÜ | 12255975 |
| JO RO OÜ kustutatud | 14639562 |
| JOHN RO OÜ | 14632979 |
| ILL & RO OÜ | 10677778 |
| RÕ TEHAS OÜ kustutatud (former name Raasiku Õlletehas OÜ) | 12423906 |
| RO WOODS OÜ | 12068776 |
| RO GRUPP OÜ kustutatud | 12980357 |
| RO-TIIM OÜ | 14979571 |
| RO INVEST OÜ | 12561175 |
| RO STUDIO OÜ | 14953815 |
| RO ARABIKA OÜ kustutatud | 12622468 |
| RO AUTOTRANS OÜ kustutatud | 11343720 |
| RO ENGINEERING OÜ | 16317874 |
| ADIS-RO OÜ | 10324330 |
| ALLA-RO OÜ | 10537675 |
| IN RO TRANS OÜ | 10958678 |
| RO & CO GRUPP OÜ | 12645311 |
| FU RO DESIGN OÜ kustutatud | 12893492 |
| RO-CLINIC EST OÜ (former name Rozenshteyn Clinic OÜ) | 14350718 |
| RO-LY TRANSPORT OÜ kustutatud | 12686445 |
| AR&RO INVEST OÜ | 11158141 |
| SA&RO INVEST OÜ | 16940194 |
| MA&RO INVEST OÜ | 14163680 |
| NE.RO ARCHITECTURE OÜ | 17444741 |
| RO&SI BALT GROUP OÜ kustutatud | 12298565 |
| ROMM ROMM OÜ | 16354326 |
| RONK RONK OÜ | 14056889 |
| ROOM ROOM OÜ kustutatud | 11902852 |
| ROOSA ROTT OÜ | 12925482 |
| ROOSA RONK OÜ | 14436043 |
| RÕNGU ROIL OÜ | 10172877 |
| ROAD ROOSTER OÜ | 16860667 |
| ROI OÜ | 10060150 |
| ROG OÜ kustutatud | 16475018 |
| ROM OÜ kustutatud | 14179209 |
| ROZ OÜ | 16808508 |
| ROX OÜ | 11162094 |
| ROC OÜ | 12621865 |
| ROF OÜ | 17023092 |
| RON OÜ | 12991496 |
| ROHELINE RONK OÜ | 14102684 |
| ROMRA ROODTUO OÜ | 17145211 |
| ROUND AND ROUND OÜ | 16231227 |
| ROLLO ROBOTICS OÜ | 17320003 |
| ROHO OÜ | 17161546 |
| ROMA OÜ (former name Tihendimeister OÜ) | 14223614 |
| ROOR OÜ | 10131039 |
| ROMB OÜ | 17056424 |
| RONA OÜ | 17453556 |
| ROOG OÜ | 16767212 |