| Company name | Reg. code |
|---|---|
| KEY OÜ | 10175002 |
| LOW KEY OÜ (former name LokiLoki OÜ) | 14754122 |
| KEY2WEB OÜ kustutatud | 16334358 |
| GOLD KEY OÜ kustutatud | 12322967 |
| LUXURY KEY OÜ | 16776553 |
| BALTIC KEY OÜ kustutatud | 14183518 |
| KULDNE KEY OÜ | 11695991 |
| GOLDEN KEY OÜ | 11974142 |
| KEY INVEST OÜ kustutatud | 16861394 |
| BLOSSOM KEY OÜ | 17200507 |
| KEY SERVICE OÜ | 14838178 |
| LEMURIAN KEY OÜ | 16432575 |
| KEY SOFTWARE OÜ kustutatud | 12135834 |
| PROVENTUM KEY OÜ | 16971510 |
| CRYPTOLOGY KEY OÜ | 17062904 |
| KEY CONSULTANTS OÜ kustutatud | 12159579 |
| KEY-CONSULTING OÜ kustutatud | 11892585 |
| DATA IS KEY OÜ (former name Sonny OÜ) | 14318148 |
| KEY PLANT BALTIC OÜ kustutatud | 14231499 |
| KEY IT CONSULTING OÜ | 16303748 |
| WHITE KEY PROPERTY OÜ | 17353501 |
| KEY MAN KINNISVARA OÜ | 10342990 |
| MAJOR KEY PRODUCTIONS OÜ | 16283862 |
| SOFTWARE KEY SOLUTIONS OÜ | 16490561 |
| KEY SOLUTION DEVELOPMENT OÜ | 14697631 |
| KEY'S GLOBAL TRADE OÜ | 14810323 |
| ANY KEY CREATIVE STUDIO OÜ | 17144523 |
| KEY4S GLOBAL CONSULTING OÜ | 14259826 |
| REAL KEY MUSIC PUBLISHING OÜ | 14574035 |
| KEY2ENABLE ASSISTIVE TECHNOLOGY OÜ | 16542039 |
| KEY FACILITIES MANAGEMENT INTERNATIONAL OÜ | 16126009 |
| KEYWEST PARTNERS OÜ kustutatud (former name Key Investments OÜ) | 14101495 |
| TECHNO CITY EESTI OÜ kustutatud (former name KEY 4U OÜ) | 11510856 |
| SMITHEREEN OÜ (former name Lock Key Games OÜ) | 17037562 |
| AUTOKEY OÜ (former name AUTO KEY SERVICE OÜ) | 11331131 |
| KEYB OÜ | 17218588 |
| KEYF GLOBAL OÜ | 17321688 |
| KEYS CENTER OÜ | 12477606 |
| VELVET KEYS OÜ | 17441919 |
| KEYM ESTONIA OÜ kustutatud | 11732999 |
| KEYAS OÜ kustutatud | 16228952 |
| KEYUP OÜ | 14572450 |
| KEYBAY OÜ kustutatud (former name OÜ Steneric) | 10865787 |
| KEYNET OÜ kustutatud | 11179172 |
| KEYFLY OÜ kustutatud | 11128045 |
| KEYROS OÜ kustutatud | 10370057 |
| KEYEST OÜ | 12738567 |
| KEYLAB OÜ kustutatud | 14676735 |
| KEYTAR OÜ | 16929123 |
| KEYTEK OÜ | 17113961 |