| 99 HENNESSY LIMITED | Private company limited by shares | Dissolved |
| HENNESSY LIMITED | Private company limited by shares | Live |
| HENNESSY ASIA LIMITED | Private company limited by shares | Dissolved |
| HENNESSY ASSET LIMITED | Private company limited by shares | Live |
| HENNESSY CAPITAL LIMITED | Private company limited by shares | Live |
| HENNESSY CREATIVE LIMITED | Private company limited by shares | Live |
| HENNESSY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HENNESSY INVESTMENTS LIMITED | Private company limited by shares | Live |
| HENNESSY & O'BRIAN LIMITED | Private company limited by shares | Dissolved |