| TRI-SEA LIMITED | Private company limited by shares | Dissolved |
| TRI-SEA LIMITED | Private company limited by shares | Dissolved |
| TRISECA LIMITED | Private company limited by shares | Dissolved |
| TRISECO LIMITED | Private company limited by shares | Live |
| TRISECTIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| Trisection Company Limited | Private company limited by shares | Live |
| TRISED COMPANY LIMITED | Private company limited by shares | Dissolved |
| TRISEMI ELECTRONICS LIMITED | Private company limited by shares | Live |
| TRISENTA LIMITED | Private company limited by shares | Dissolved |
| TRISET FASHIONS LIMITED | Private company limited by shares | Dissolved |
| TRISEVEN LIMITED | Private company limited by shares | Dissolved |