| 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 |