| Company | Timeline | Status | |
| Allanvale Land (Pentland) Limited Director • Unreported | 11 Jul 2023←2 Years 4 Months→Current | Active | |
| Campbell Real Estate Limited Director • Unreported | 22 May 2019←6 Years→Current | Active | |
| Campbell Fuel Oils Limited Director • Unreported | 27 Feb 2019←6 Years→Current | Active | |
| Campbell Energy Limited Director • Unreported | 4 Apr 2014←11 Years→Current | Active | |
| Hamilton & Co. Management Limited Director • Unreported | 17 Mar 2010←15 Years→Current | Active | |
