| Company | Timeline | Status | |
| Ackerman Engineering Limited Director • Housewife | 13 Mar 1992←23 Years→19 Jun 2015 | Active | |
| Ackerman Engineering Limited Secretary • Unreported | 13 Mar 1992←23 Years→19 Jun 2015 | Active | |
| Checkmate Devices Limited Director • Company Director | 4 Jun 1991←34 Years→Current | Active | |
| Checkmate Devices Limited Secretary • Unreported | 4 Jun 1991←34 Years→Current | Active | |
| Checkmate Devices Limited Secretary • Unreported | 1 Jan 1970←55 Years→3 Oct 2025 | Active | |
| Checkmate Devices Limited Director • Company Director | 1 Jan 1970←55 Years→3 Oct 2025 | Active | |
