| ONCA LIMITED | Private company limited by shares | Dissolved |
| ONCA LIMITED | | Live |
| ONCALL COMPANY LIMITED | Private company limited by shares | Live |
| Oncall E-commerce Co., Limited | Private company limited by shares | Live |
| ONCALL SOLUTIONS LIMITED | Private company limited by shares | Live |
| Oncam Asia Limited | Private company limited by shares | Live |
| ONCAPITAL LIMITED | Private company limited by shares | Live |
| ONCAPITAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONCAR INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| ONCARD LIMITED | Private company limited by shares | Live |
| ONCARE HK LIMITED | | Live |