| Company | Timeline | Status | |
| Alexander Mills Civils Ltd Director • Unreported | 20 Nov 2019←5 Years→Current | Active | |
Alexander Building Contractors Ltd Director • Manager | 9 May 2014←2 Years 1 Month→28 Jun 2016 | Dissolved | |
| Alexander (Plant) Ltd Director • Unreported | 31 May 2013←12 Years→Current | Active | |
| W & H Alexander Ltd Director • Unreported | 30 May 2013←12 Years→Current | Active | |
| Gael Force Renewables Limited Director • Unreported | 1 Jan 2012←13 Years→Current | Active | |
| William And Henry Alexander (Civil Engineering) Limited Director • Unreported | 27 Sep 2006←19 Years→Current | Active | |
