| Company name | Reg. code |
|---|---|
| MKK OÜ kustutatud | 10062002 |
| MKK GROUP OÜ (former name Aktsiaselts MKK Group) | 10250873 |
| MKK TEENUS OÜ | 10651322 |
| MKK EHITUS OÜ | 17336201 |
| GENEVAS MKK OÜ | 16689417 |
| MKKG OÜ | 14944093 |
| MKKY SALES OÜ | 16739836 |
| MKKR INVEST OÜ | 12863002 |
| MIKK & MIKK OÜ | 10260920 |
| MIKK OÜ | 16111173 |
| MKI OÜ | 12480407 |
| EKK OÜ | 17313759 |
| KKK OÜ | 14304175 |
| ÄKK OÜ kustutatud (former name KAUK OÜ) | 14044828 |
| MKP OÜ | 14282864 |
| MDK-137 OÜ | 17334254 |
| MAK OÜ kustutatud | 10821407 |
| MHK OÜ | 17250362 |
| KMK OÜ | 11673535 |
| MEK OÜ | 12457153 |
| MKA OÜ | 17409377 |
| MKS OÜ | 14246414 |
| MKH OÜ (former name Haabneeme Varad OÜ) | 16000099 |
| MKL OÜ | 14293566 |
| MKC OÜ | 12466850 |
| MKNK OÜ | 16648022 |
| MKM OÜ | 14665714 |
| MKF HALDUS OÜ | 11246655 |
| MAK CONSULT OÜ (former name MAKA Consult OÜ) | 17400548 |
| BKK HOLDING OÜ | 12615474 |
| MKP-HOLDING OÜ (former name MJK Advisors OÜ) | 14395858 |
| MKR PROJEKT OÜ | 16076347 |
| MIK ESTONIA OÜ | 16345630 |
| MHK ARENDUSGRUPP OÜ | 10722935 |
| K3IKK OÜ | 16103185 |
| JKK INVEST OÜ | 14562670 |
| MKJ CONSULT OÜ | 14137702 |
| MKA GRUPP OÜ | 12913042 |
| GKK INNOVATIONS OÜ | 17414409 |
| MKB FOOD OÜ kustutatud | 12184904 |
| MKL INVEST OÜ | 16553913 |
| MKMK VALDUS OÜ | 17107819 |
| PW MAKK OÜ | 16836344 |
| TÕHELA MEK OÜ (former name Riidekoi OÜ) | 14017792 |
| KMK VALDUS OÜ kustutatud | 12230082 |
| MIKK KAPITAL OÜ | 17038685 |
| MKP CONSULTANCY OÜ kustutatud | 16187153 |
| MUHU MEKK OÜ kustutatud | 14046968 |
| KMK RESTORANID OÜ | 17479308 |
| IKK HOLDING OÜ | 11371691 |