| OXYGEN LIMITED | Private company limited by shares | Live |
| OKU OXYGEN LIMITED | Private company limited by shares | Live |
| OXYGEN AREA LIMITED | Private company limited by shares | Live |
| Oxygen 1 Creative Limited | Private company limited by shares | Live |
| MARS OXYGEN COMPANY LIMITED | Private company limited by shares | Live |
| Oxygen trade Limited | Private company limited by shares | Live |
| OXYGENE LIMITED | Private company limited by shares | Live |
| Oxygenizer HK Limited | | Live |
| OXYGENLINK PUBLISHING COMPANY LIMITED | Private company limited by shares | Live |
| OXYGENR LIMITED | Private company limited by shares | Live |
| Oxygenta Limited | Private company limited by shares | Live |
| OxygenWaterConservation International Limited | Private company limited by shares | Dissolved |