| Company | Timeline | Status | |
| Holbrook Group Ltd Director • Unreported | 1 Oct 2009←16 Years→Current | Active | |
| Holbrook Electrical Ltd Director • Unreported | 20 May 2005←20 Years→Current | Active | |
| Holbrook Electrical Ltd Secretary • Director | 20 May 2005←20 Years→Current | Active | |
| Holbrook Engineering Limited Secretary • Director | 1 Feb 2004←21 Years→Current | Active | |
| Holbrook Engineering Limited Director • Unreported | 24 Oct 2003←22 Years→Current | Active | |
