| ATCO ASIA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO (CHINA) INVESTMENTS LIMITED | Private company limited by shares | Live |
| ATCO CO., LIMITED | Private company limited by shares | Live |
| ATCO FAR EAST COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO ENTERPRISE LIMITED | Private company limited by shares | Live |
| ATCO Construction (Hong Kong) Limited | Private company limited by shares | Live |
| ATCO INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| Atco Industrial Limited | Private company limited by shares | Live |
| SHENZHEN ATCO INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL HK LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ATCO INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ATCO PACIFIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO TOYS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO TRADING COMPANY LIMITED | Private company limited by shares | Live |
| ATCO UNIVERSAL LIMITED | Private company limited by shares | Live |
| ATCON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |