| LOI KEE TRENCH ENGINEERING CO. LIMITED | Private company limited by shares | Dissolved |
| TRENCH HOLDINGS LIMITED | Private company limited by shares | Live |
| TRENCH (HONG KONG) HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| Pacific Trench (Hong Kong) Limited | Private company limited by shares | Live |
| TRENCH PRODUCTIONS LIMITED | Private company limited by shares | Live |
| RICHARD TRENCH AND SONS LIMITED | Private company limited by shares | Dissolved |
| Trenchant Service Limited | Private company limited by shares | Live |
| TRENCHARD LIMITED | Private company limited by shares | Dissolved |
| BESTWIN TRENCHLESS CO., LIMITED | Private company limited by shares | Live |
| DRILLTO TRENCHLESS CO., LIMITED | Private company limited by shares | Live |
| DRILLTO TRENCHLESS COMPANY LIMITED | Private company limited by shares | Live |