| ONEX LIMITED | Private company limited by shares | Live |
| Onex Alliance Capital Limited | Private company limited by shares | Live |
| ONEX ASIA-PACIFIC INVESTMENT CO., LIMITED | Private company limited by shares | Dissolved |
| Onex Engineering Consultants Company Limited | Private company limited by shares | Live |
| Onex Corporation Limited | Private company limited by shares | Live |
| ONEX DEVELOPMENT LIMITED | Private company limited by shares | Live |
| ONEX ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONEX ENGINEERING COMPANY LIMITED | | Live |
| ONEX ENTERPRISE LIMITED | Private company limited by shares | Live |
| ONEX ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ONEX HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| ONEX HOLDINGS LIMITED | Private company limited by shares | Live |
| ONEX (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| ONEX INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ONEX INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONEX INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ONEX INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONEX TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ONEX Technology Limited | Private company limited by shares | Live |
| ONEXENO LIMITED | Private company limited by shares | Dissolved |
| ONEXIN LIMITED | Private company limited by shares | Live |
| ONEXOURCE LIMITED | Private company limited by shares | Live |
| ONExperience Group Limited | Private company limited by shares | Live |
| ONEXPRESS LIMITED | Private company limited by shares | Dissolved |
| Onexpress Limited | | Live |
| ONEXT LIMITED | Private company limited by shares | Live |