| Company name | Reg. code |
|---|---|
| RSO OÜ | 14019865 |
| RSO SÜSTEEMIDE OÜ | 10154537 |
| RSO PRODUCTION BY VOLOSHYN OÜ | 17018174 |
| RSOFT OÜ | 16419600 |
| RSONE OÜ | 17062502 |
| RSOSAD OÜ | 14342951 |
| RSM OÜ | 11888827 |
| DSÕ OÜ | 16966874 |
| RCO OÜ | 14572438 |
| NSO OÜ (former name A.T.B OÜ) | 16199110 |
| RMO OÜ | 12161990 |
| OSO OÜ | 12229937 |
| RESO OÜ kustutatud | 16853414 |
| RSC OÜ | 10452447 |
| RSK OÜ kustutatud | 14783945 |
| RSQ OÜ | 11997479 |
| RSE OÜ | 14864388 |
| RSA2 OÜ | 17177561 |
| 3RIO OÜ | 14246035 |
| RSG OÜ | 12414296 |
| RSI INVEST OÜ | 12626874 |
| PSO CONSULTING OÜ | 16943347 |
| RSA CONSULTING OÜ kustutatud | 16862471 |
| RMO CAPITAL OÜ | 10242649 |
| RSI OSALUSED OÜ | 17424974 |
| RSA TEENUSED OÜ | 12602661 |
| CSO SERVICE OÜ | 17473659 |
| RKO TRADE OÜ | 17153133 |
| RSK PLUSS OÜ kustutatud | 11446012 |
| RIO AMSTEL OÜ kustutatud | 14679426 |
| RSM INVESTMENTS OÜ (former name Animal Lovers OÜ) | 16127607 |
| RIO MADRE OÜ | 16015630 |
| SEMTRUVARTO BSO OÜ (former name WGA Wood OÜ) | 14805842 |
| ISO PROFIT OÜ | 14313116 |
| ROS AUTO OÜ | 12514230 |
| ZETA RHO OÜ kustutatud | 14452912 |
| KSO KAPITAL OÜ | 16439422 |
| RSH SERVICE OÜ | 16042650 |
| RIO-STEFFI OÜ | 16172074 |
| RIO RESTORAN OÜ kustutatud | 16274389 |
| RIO&CO. OÜ kustutatud | 16226433 |
| RIO MARINE OÜ | 10460853 |
| RIO REISID OÜ | 11936710 |
| RIO CATERING OÜ kustutatud | 12770944 |
| RNO HALDUS OÜ | 16508108 |
| RSG HOLDING OÜ | 14084650 |
| EL OSO OÜ | 14026262 |
| ROS AGRICULTURE OÜ kustutatud | 14504081 |
| ERSO WOOD OÜ | 14751974 |
| RSH INVEST OÜ kustutatud | 12395073 |