| ATRIUM LIMITED | Private company limited by shares | Live |
| Atrium Asia Limited | Private company limited by shares | Live |
| Atrium Staffing Asia Limited | Private company limited by shares | Live |
| ASOK ATRIUM COMPANY LIMITED | | Live |
| ATRIUM CREATIVE CO., LIMITED | Private company limited by shares | Live |
| Atrium Corporation Limited | Private company limited by shares | Live |
| Atrium Medical Corporation Limited | Private company limited by shares | Dissolved |
| ATRIUM CREATION LIMITED | Private company limited by shares | Dissolved |
| Atrium Development Company Limited | Private company limited by shares | Live |
| ATRIUM DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| ATRIUM PRECISION ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| GLOBAL ATRIUM LIMITED | Private company limited by shares | Dissolved |
| Atrium Engineering (HK) Inc. Limited | Private company limited by shares | Live |
| Atrium Innovations (HK) Limited | Private company limited by shares | Live |
| ATRIUM HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Atrium Health (Hong Kong) Inc. Limited | Private company limited by shares | Live |
| ATRIUM INFORMATION SYSTEMS (HK) LIMITED | Private company limited by shares | Dissolved |
| ATRIUM INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATRIUM INTERNATIONAL HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Atrium Investment Limited | Private company limited by shares | Dissolved |
| ATRIUM DESIGN & MARKETING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MASTER ATRIUM LIMITED | Private company limited by shares | Dissolved |
| Atrium Construction material Limited | Private company limited by shares | Live |
| ATRIUM MEMBERSHIP SERVICES LIMITED | Private company limited by shares | Dissolved |
| SINO ATRIUM LIMITED | Private company limited by shares | Dissolved |
| ATRIUM STATION LIMITED | Private company limited by shares | Dissolved |
| ATRIUM TRADING LIMITED | Private company limited by shares | Dissolved |
| ATRIUM TRAVEL LIMITED | Private company limited by shares | Live |