| Company Name | Type | Status |
|---|---|---|
| HK OLINE IMPORT&EXPORT CO., LIMITED | Private company limited by shares | Live |
| OLINE TECHNOLOGY R&D CO., LIMITED | Private company limited by shares | Live |
| O-LINE TECHNOLOGY (H.K.) LIMITED | Private company limited by shares | Dissolved |
| OLINE (HK)INTERNATIONAL LIMITED | Private company limited by shares | Live |
| OLINE ISLAND DEVELOPMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| OLine Piano Education Group Limited | Private company limited by shares | Live |