| Company Name | Type | Status |
|---|---|---|
| TREFOIL COMPANY LIMITED | Private company limited by shares | Dissolved |
| Trefoil Company Limited | Private company limited by shares | Live |
| TREFOIL (Hongkong) Life Science Research Center Pty Limited | Live | |
| TREFOIL TEX CO., LIMITED | Private company limited by shares | Live |
| Trefoil Consulting Engineering Limited | Private company limited by shares | Live |
| TREFOIL ENGINEERING LIMITED | Private company limited by shares | Dissolved |