| ATUM LIMITED | Private company limited by shares | Dissolved |
| ATUM Asia Limited | | Live |
| ATUM Campfire Limited | | Live |
| Atum Consulting HK Limited | Private company limited by shares | Live |
| Atum Culture Limited | Private company limited by shares | Live |
| ATUM ENERGY LIMITED | Private company limited by shares | Live |
| Atum International Limited | Private company limited by shares | Live |
| ATUM INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Atum Digital Management Limited | | Live |
| ATUM Restaurant Limited | Private company limited by shares | Live |
| ATUM Skypark Limited | Private company limited by shares | Live |
| Atum Technology Limited | Private company limited by shares | Dissolved |
| ATUM INTERNATIONAL TECHNOLOGY TRADING LIMITED | Private company limited by shares | Live |
| Atumon Limited | Private company limited by shares | Live |
| Atumtek Limited | Private company limited by shares | Live |