| AECO Limited | Private company limited by shares | Dissolved |
| AECO ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| AECO GROUP LIMITED | Private company limited by shares | Live |
| AECO ASIA (HK) LIMITED | Private company limited by shares | Dissolved |
| AECO HOLDING LIMITED | Private company limited by shares | Live |
| AECO INTERNATIONAL ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| AECO LIFE CO., LIMITED | Private company limited by shares | Live |
| AECOLIGHT (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| AECOM BGI Company Limited | Private company limited by shares | Dissolved |
| AECOM (APAC) Limited | Private company limited by shares | Live |
| AECOM Asia Company Limited | Private company limited by shares | Live |
| Aeconsun Technologies Limited | Private company limited by shares | Live |
| HNY AEconversion Limited | Private company limited by shares | Live |
| AEconversion Hong Kong Limited | Private company limited by shares | Live |
| Hong Kong Aecooly Technology CO., Limited | | Live |
| AECORE LIMITED | Private company limited by shares | Live |
| Aecotech Limited | Private company limited by shares | Live |