| A-TECH LIMITED | Private company limited by shares | Dissolved |
| ATECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATECH LIMITED | Private company limited by shares | Live |
| Atech Aquatics Limited | Private company limited by shares | Live |
| A-TECH COURIER CENTRE LIMITED | Private company limited by shares | Dissolved |
| A-TECH ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| A-TECH ENTERPRISE LIMITED | Private company limited by shares | Live |
| ATECH INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| A-TECH INVESTMENTS LIMITED | Private company limited by shares | Live |
| ATECH MACHINERY LIMITED | Private company limited by shares | Live |
| ATECH PLASTIC MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| A-TECH PACIFIC LIMITED | Private company limited by shares | Dissolved |
| A-TECH PRECISION LIMITED | Private company limited by shares | Dissolved |
| SCENARIO ATECH LIMITED | Private company limited by shares | Dissolved |
| A-TECH SCIENTIFIC LIMITED | Private company limited by shares | Dissolved |
| ATECH SCIENTIFIC MEASUREMENT LIMITED | Private company limited by shares | Live |
| ATech Solution Limited | Private company limited by shares | Live |
| ATECH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| A-TECH SYSTEMS LIMITED | Private company limited by shares | Live |
| ATECHBCN HK LIMITED | | Live |
| A-TECHEM DEVELOPMENT (H.K.) CO., LIMITED | Private company limited by shares | Dissolved |
| ATECHNICS LIMITED | Private company limited by shares | Dissolved |
| A-TECHNOLOGY HK CO., LIMITED | | Live |