| Company | Timeline | Status | |
| T.M. Simpson Limited Director • Master Plumber | 31 Oct 1988←37 Years→Current | Active | |
| T. M. Simpson (Holdings) Limited Director • Company Director | 31 Oct 1988←36 Years→17 Dec 2024 | Dissolved | |
| T M Simpson (Plumbers) Limited Director • Director | 3 May 1988←37 Years→Current | Active | |
