| ACE SIFO INDUSTRIAL LIMITED | Private company limited by shares | Live |
| SiFO Technology (Hongkong) Co., Limited | Private company limited by shares | Live |
| SifoDyas Limited | Private company limited by shares | Dissolved |
| SIFON ASIA HOLDING LIMITED | Private company limited by shares | Dissolved |
| SIFONE ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SIFONE ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SIFORD LIMITED | Private company limited by shares | Live |
| SIFOTEC LIMITED | Private company limited by shares | Live |