| Company name | Reg. code |
|---|---|
| RIFKA OÜ (former name Limited OÜ) | 14246437 |
| RISKA 19 OÜ | 12667471 |
| RISKA OÜ | 17453148 |
| SIFKA OÜ | 16703732 |
| RIKA OÜ | 12015320 |
| RIMKA GROUP OÜ (former name RIMKA EHITUS OÜ) | 14264530 |
| ROFKA EHITUS OÜ | 16871004 |
| RIKA METS OÜ | 12227677 |
| RIKA MOR OÜ | 10845655 |
| RIKA PUIT OÜ | 12081015 |
| RIKA PEREKAUBAD OÜ kustutatud | 11998527 |