| Company name | Reg. code |
|---|---|
| BLACKHOLM OÜ | 14729393 |
| BLACKHOLE CONSULTING OÜ kustutatud | 16240154 |
| BLACKHILL OÜ | 14829914 |
| BLACKHORN OÜ (former name Öine Täht OÜ) | 16907251 |
| BLACKGOLD OÜ kustutatud | 11503715 |
| BLAUHOLM OÜ kustutatud | 11508629 |
| BLACKHAM OÜ | 12375389 |
| BLACKHILL DEV OÜ | 16017356 |
| BLACKHILL MANAGEMENT OÜ (former name Blackhill Management UÜ) | 12977504 |
| BLACKGOLD INVEST OÜ kustutatud | 12030549 |
| BLACKWOLF INVEST OÜ | 12754655 |
| GHOHA KAKOAKA OÜ kustutatud (former name BLACKFOAM OÜ) | 14302704 |