| Company name | Reg. code |
|---|---|
| RKJ OÜ | 14431749 |
| RKJ VEOD OÜ | 14180951 |
| RKJ GRUPP OÜ | 16075715 |
| RKJ HOLDINGS OÜ | 17010349 |
| HANEPAJU OÜ (former name RKJ Automaatika OÜ) | 14817029 |
| SPARKPIPE OÜ (former name RKJ Invest House OÜ) | 16540365 |
| RKB OÜ | 10938090 |
| RTJ OÜ | 16043460 |
| RKP OÜ | 14339044 |
| RKE OÜ kustutatud | 10100754 |
| LKJ OÜ | 14196277 |
| RKI OÜ | 16221720 |
| RKS OÜ | 10773884 |
| RKG OÜ | 16936413 |
| TKJ OÜ | 16459344 |
| RKM OÜ | 14417293 |
| RKP20 OÜ kustutatud | 14112381 |
| RKD OÜ kustutatud | 12506101 |
| RKV OÜ | 10115218 |
| RKT OÜ | 10243896 |
| RKN OÜ | 16216239 |
| RKR OÜ | 16465333 |
| RKF OÜ | 16046895 |
| RKH MANAGEMENT OÜ kustutatud | 14500195 |
| HKJ INVEST OÜ | 16606816 |
| RKR SEADMED OÜ | 11733527 |
| RKK STEEL OÜ kustutatud (former name MHO Eesti OÜ) | 11455057 |
| RKS KONSULT OÜ | 17414740 |
| RKT TRADE OÜ | 16949775 |
| RKM UNLIMITED OÜ | 17344146 |
| KKJ IMPLEMENTS OÜ | 12815204 |
| RKO TRADE OÜ | 17153133 |
| RKR TEENUSED OÜ | 17087442 |
| MKJ TORULAHENDUSED OÜ | 11707180 |
| ESTONTECO RKM OÜ | 12885720 |
| RJJ HOLDING OÜ kustutatud | 12881299 |
| RKE GROUP OÜ | 14474530 |
| RKR HOLDING OÜ | 16075552 |
| RKV TRADES OÜ | 17042468 |
| RIJ TEENUSED OÜ | 12960165 |
| MKJ TOOTMINE OÜ | 17464324 |
| AKJ EHITUS OÜ | 12793129 |
| RKL ARENDUS OÜ | 11286100 |
| RKS INVEST OÜ | 10890259 |
| BALTIK SKJ OÜ kustutatud | 12503864 |
| RKC EHITUSABI OÜ | 14458470 |
| SKJ TRADE OÜ | 16408074 |
| RKX INVEST OÜ (former name OÜ FoodPay) | 17142230 |
| RTJ INVEST OÜ | 12252741 |
| RKM TEAM OÜ | 11533107 |