| Company name | Reg. code |
|---|---|
| RKR HOLDING OÜ | 16075552 |
| RCR HOLDING OÜ kustutatud | 10879200 |
| JKR HOLDING OÜ (former name Jen & Kaan Holding OÜ) | 14310394 |
| GKR HOLDING OÜ | 16204064 |
| RKIR HOLDINGS OÜ | 14611931 |
| RKJ HOLDINGS OÜ | 17010349 |
| RKS HOLDINGS OÜ | 16117098 |
| AIRION TECHNOLOGIES OÜ (former name RR Holding & Management OÜ) | 17179440 |
| NZULO MATANDA OÜ (former name KR Property Holding OÜ) | 14841973 |