| Company Name | Type | Status |
|---|---|---|
| O'er Company Limited | Private company limited by shares | Live |
| Oerlikon China Equity Limited | Private company limited by shares | Live |
| OERLIKON PHILLIPS INTERNATIONAL EXHIBITION (HK) CO., LIMITED | Private company limited by shares | Live |
| OERSTED LIMITED | Private company limited by shares | Dissolved |
| OERTON INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OERTZEN TRADING COMPANY LIMITED | Live | |
| HONG KONG OERYA INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |