| SANTRO TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SANTROMAX LIMITED | Private company limited by shares | Dissolved |
| SANTRON LIMITED | Private company limited by shares | Live |
| SANTRON ENTERPRISES LIMITED | Private company limited by shares | Live |
| SANTRON INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| SANTRON SHIPPING LIMITED | Private company limited by shares | Dissolved |
| SANTRONIC ELECTRONICS COMPANY LIMITED | Private company limited by shares | Live |
| HONGKONG SANT-STARS INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| HK SANTU ELECTRONICS CO., LIMITED | | Live |
| Santuary Logistic Limited | Private company limited by shares | Live |
| Santus Optics Tech Limited | Private company limited by shares | Live |
| SANTUX GROUP LIMITED | Private company limited by shares | Live |
| SANTYOU TECHNOLOGY (HK) CO., LIMITED | Private company limited by shares | Live Commenced dormancy on 19-Oct-2018 |