| Company | Timeline | Status | |
| M. Holleran Limited Director • Consultant Engineer | 17 Aug 1993←→31 Jul 1993 | Dissolved | |
| Roxburgh Estates Limited Director • Consultant Engineer | 31 Dec 1990←32 Years→22 May 2023 | Active | |
| Roxburgh Estates Limited Secretary • Unreported | 31 Dec 1990←1 Year 4 Months→30 Apr 1992 | Active | |
