| Company name | Reg. code |
|---|---|
| GGK OÜ | 12756720 |
| GGK INVEST OÜ | 12213787 |
| GGKS ASSOCIATES OÜ | 14673004 |
| VGK OÜ | 12105603 |
| LGK OÜ (former name Osaühing LGK) | 10073916 |
| HGK OÜ | 17193249 |
| GHK OÜ (former name Junior Shipping OÜ) | 12937887 |
| TGK OÜ | 16566726 |
| EGK OÜ | 16661301 |
| AGK ADVISO OÜ | 17174709 |
| GZK COMPANY OÜ | 12473910 |
| GGM DIGITAL OÜ | 14976087 |
| GKK INNOVATIONS OÜ | 17414409 |
| O3LGK OÜ kustutatud (former name EuroSensor OÜ) | 12931703 |
| GGT PRO OÜ | 16786439 |
| GMK MARKETING OÜ | 16911270 |
| GGR GRUPP OÜ | 14908200 |
| GGR50 HOLDING OÜ (former name MAI Group OÜ) | 17006066 |
| GPK TEAM OÜ | 12802845 |
| KGK INVEST OÜ | 14377814 |
| GFK CAPITAL OÜ (former name Z-SPORDIKLUBI OÜ) | 12560081 |
| LGK ATRAKTSIOONID OÜ kustutatud | 10139615 |
| GKG GROUP OÜ | 16619670 |
| RGK MEDIA OÜ | 14696488 |
| GRK ILUTEENUSED OÜ | 16540916 |
| VGK JEFOREN OÜ kustutatud | 16664892 |
| GMK CONSULT OÜ | 17035586 |
| MGK KINNISVARAHALDUS OÜ | 14686828 |
| GTK GRUPP OÜ | 16535186 |
| GDK NUTRITION OÜ | 16619368 |
| GKK-KEYS OÜ | 17008684 |
| GGM INVEST OÜ | 14784703 |
| MGK KITCHEN OÜ | 12642560 |
| MARX MGK OÜ | 11099094 |
| GVK MEISTRID OÜ | 11312234 |
| TGK-LINK OÜ kustutatud | 10140392 |
| GGP EHITUS OÜ | 16077172 |
| GOK2 MUSIC OÜ | 17191731 |
| GPK ARENDUS OÜ | 11285265 |
| MGK BUILDING OÜ (former name Aleart OÜ) | 14956825 |
| GJK SMARTS OÜ | 17014383 |
| GKG DRIVE OÜ kustutatud (former name AG Veod OÜ) | 12449350 |
| GSK GARAGE OÜ | 16839803 |
| KGK CONSULT OÜ | 12605990 |
| KGK-AISI OÜ | 10017415 |
| GPK PARTNERID OÜ | 10000550 |
| MGK GRUPP OÜ | 12306218 |
| TGK GEO OÜ | 10176608 |
| GMK GRUPP OÜ (former name Happyclean OÜ) | 16134702 |
| GOK2 MUSIC OÜ kustutatud | 16835273 |