| Company | Timeline | Status | |
| McCallum Limited Secretary • Unreported | 24 Aug 2007←18 Years→Current | Active | |
| McCallum Domestic Limited Secretary • Unreported | 13 Oct 2004←21 Years→Current | Active | |
| McCallum Water Heating Limited Secretary • Unreported | 21 Nov 2002←23 Years→Current | Active | |
| McCallum Calorifiers Limited Secretary • Unreported | 12 Nov 2002←23 Years→Current | Active | |
| McCallum (Barrhead) Limited Secretary • Unreported | 12 Nov 2002←23 Years→Current | Active | |
| GRM Manufacturing Limited Secretary • Unreported | 11 Oct 2002←23 Years→Current | Active | |
