| A.T.C. LIMITED | Private company limited by shares | Dissolved |
| ATCC LIMITED | Private company limited by shares | Dissolved |
| ZAMIR & ATCCO INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| ATCG LIMITED | Private company limited by shares | Live |
| ATCG CONSULTING CO., LIMITED | Private company limited by shares | Dissolved |
| ATCG International Limited | Private company limited by shares | Live |
| ATCGENE MEDICAL CENTRE LIMITED | Private company limited by shares | Live |
| Atchaincg Co., Limited | Private company limited by shares | Live |
| AT-CHINESE (HK) LIMITED | Private company limited by shares | Live |
| ATCHISON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ATCHO COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCHO LIMITED | | Live |
| AtCipher.com Limited | Private company limited by shares | Live |
| ATCL INDUSTRIAL CORP. LIMITED | Private company limited by shares | Live |
| ATCN TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ATCNET TECHNOLOGY LIMITED | Private company limited by shares | Live |
| 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 |
| ATC-PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| ATCROSSWORKSHOP COMPANY LIMITED | Private company limited by shares | Live |