| Company | Timeline | Status | |
| Gilberts Property Design And Development Limited Director • Architect | 2 Oct 2007←18 Years→Current | Active | |
| Gilberts Property Design And Development Limited Director • Architect | 2 Oct 2007←17 Years→1 Oct 2024 | Active | |
| Halyard Limited Director • Architect | 2 Mar 1998←27 Years→Current | Active | |
| Halyard Limited Secretary • Architect | 2 Mar 1998←27 Years→Current | Active | |
| Gilbert Associates Limited Director • Architect | 1 Jul 1996←29 Years→Current | Active | |
| Gilbert Associates Limited Secretary • Unreported | 1 Jul 1996←29 Years→Current | Active | |
| Gilbert Associates Limited Secretary • Unreported | 1 Jul 1996←27 Years→1 Jun 2024 | Active | |
| Gilbert Associates Limited Director • Architect | 1 Jul 1996←27 Years→1 Jun 2024 | Active | |
J & F Johnston (Overseas) Limited Director • Architect | 29 Nov 1988←3 Years→31 Aug 1992 | Dissolved | |
