| Company name | Reg. code |
|---|---|
| ONTAKE OÜ | 17456916 |
| ONTIME OÜ kustutatud | 10792597 |
| ONTORE OÜ | 11173152 |
| ONTANO OÜ | 10974938 |
| ONTIKA TALU OÜ | 10316750 |
| ONTIKA AGRO OÜ | 11476605 |
| ONTIME INVESTMENTS OÜ (former name Ontime Investments UÜ) | 14876606 |
| ONTIME PARTNERS OÜ | 11220124 |
| ONTIKA HOSPITALITY & SPORT OÜ | 17476020 |
| ONGAKU OÜ | 16331302 |
| CONTARE OÜ (former name Hansar & Korb OÜ) | 11591317 |
| OMTAKS OÜ | 14424206 |
| OCTANE OÜ | 16993925 |
| OKSAKE OÜ | 16000447 |
| ONEMAKE OÜ kustutatud | 14635357 |
| DATAKE OÜ | 14238805 |
| INGAKE OÜ | 12236392 |
| ONESTAKE OÜ | 16475194 |
| SOFTAKE OÜ | 16517834 |
| OPTARE OÜ | 14762423 |
| FONTAKT OÜ (former name Klienditugi OÜ) | 11091789 |
| ONNIKE OÜ | 10086416 |
| MONTAGE OÜ kustutatud | 12151388 |
| OTTOKE OÜ | 16218853 |
| OSTAKV24 OÜ kustutatud | 14893645 |
| KATAKE OÜ | 16579151 |
| OSTARE OÜ | 10262333 |
| OPTAKT OÜ | 11297894 |
| NOTKE OÜ | 14987547 |
| ORTAK OÜ | 16511139 |
| OTIKE OÜ | 10398357 |
| OCTAVE DIGITAL OÜ | 17411598 |
| KONTAKT INVESTEERINGUTE OÜ | 11492443 |
| MONTAGE TEAM OÜ (former name HansaCostumer OÜ) | 14310827 |
| EUR MONTAGE 10 OÜ kustutatud | 12192465 |
| INMAKE GRUPP OÜ | 16375044 |
| DENNI KONTAKT OÜ | 12227170 |
| OPTAKT LABS OÜ | 16248104 |
| KONTAKT & TECH OÜ | 16854690 |
| MONTAGE PARTNERS OÜ kustutatud | 11307121 |
| GEORG-KONTAKT OÜ kustutatud | 16665670 |
| MAA KONTAKT OÜ | 11335749 |
| BOOBIX MONTAGE OÜ kustutatud | 12747649 |
| ABC MONTAGE OÜ kustutatud | 14597556 |
| MONTAGE SERVICE OÜ (former name Klaus Schröder Montage Service OÜ) | 12862729 |
| WELDINDUSTRY MONTAGE OÜ | 16997490 |
| MONTAGE PARTNER OÜ | 16800621 |
| OCTANE STYLING OÜ kustutatud | 12163954 |
| TPS MONTAGE OÜ | 12707259 |
| BALTIC MONTAGE OÜ | 12816853 |