| MAYSI ENTERPRISE COMPANY LIMITED | Private company limited by shares | Live |
| MAYSI (KOREA) CO., LIMITED | Private company limited by shares | Dissolved |
| MAYSIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAYSIC CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| MAYSIC ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| MAYSIC INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| MAYSING ASIA ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Maysis Co., Limited | | Live |
| MAYSIT LIMITED | Private company limited by shares | Dissolved |