| Company name | Reg. code |
|---|---|
| GKR HOLDING OÜ | 16204064 |
| RKR HOLDING OÜ | 16075552 |
| GGR50 HOLDING OÜ (former name MAI Group OÜ) | 17006066 |
| GSR HOLDING OÜ (former name Mergersteel OÜ) | 14912199 |
| JKR HOLDING OÜ (former name Jen & Kaan Holding OÜ) | 14310394 |
| GK HOLDING OÜ | 11739398 |
| NZULO MATANDA OÜ (former name KR Property Holding OÜ) | 14841973 |