| Company | Timeline | Status | |
| Wheal Martyn Trust Secretary • Unreported | 17 May 1992←4 Months→23 Sep 1992 | Active | |
| Penrice House (St. Austell) Limited Secretary • Unreported | 18 Jul 1991←28 Years→30 Apr 2020 | Active | |
| Wheal Martyn Enterprises Limited Secretary • Unreported | 9 Apr 1991←1 Year 5 Months→23 Sep 1992 | Active | |
