| HYFAT TRADING LIMITED | Private company limited by shares | Dissolved |
| HYFATRON ELECTRONIC COMPANY LIMITED | Private company limited by shares | Live |
| HYFEEL TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Hyflux Utility WWT (BC) Limited | Private company limited by shares | Live |
| Hyflux Utility WT (GCL) Limited | Private company limited by shares | Live |
| Hyflux Utility WWT (GY) Limited | Private company limited by shares | Live |
| Hyflux Utility WTP (GY) Limited | Private company limited by shares | Live |
| Hyflux Utility (HLD) Limited | Private company limited by shares | Live |
| HYFLUX LIGHTING (HONG KONG) LIMITED | Private company limited by shares | Live |
| Hyflux Utility (LP) Limited | Private company limited by shares | Live |
| Hyflux Utility WT (LY) Limited | Private company limited by shares | Live |
| Hyflux Utility WT (MG) Limited | Private company limited by shares | Live |
| Hyflux Utility WWT (MG) Limited | Private company limited by shares | Live |
| Hyflux Utility (TJ) Limited | Private company limited by shares | Live |
| Hyflux Utility (TY) Limited | Private company limited by shares | Live |
| Hyflux Utility WWTP (GY) Limited | Private company limited by shares | Live |
| Hyflux Utility (WX) Limited | Private company limited by shares | Live |
| Hyflux Utility (YK) Limited | Private company limited by shares | Live |
| Hyflux Utility WWT (YKG) Limited | Private company limited by shares | Live |
| Hyflux Utility WT (YKG) Limited | Private company limited by shares | Live |
| Hyflux Utility WWT (YL) Limited | Private company limited by shares | Live |
| Hyflux Utility (YL) Limited | Private company limited by shares | Live |
| Hyflux Utility WT (YL) Limited | Private company limited by shares | Live |
| HYFORM LIMITED | Private company limited by shares | Dissolved |
| HYfortune International Trade Limited | Private company limited by shares | Live |
| QUANZHOU HYFS INDUSTRY AND TRADE CO., LIMITED | Private company limited by shares | Live |
| HYFUNG TRADING COMPANY (H.K.) LIMITED | Private company limited by shares | Dissolved |
| HYFUS INTERNATIONAL LIMITED | Private company limited by shares | Live |