| Company | Timeline | Status | |
| Parker Environmental Services Holdings Limited Director • Director | 14 Jul 2025←5 Months→Current | Active | |
| Nuclear Ductwork Systems Limited Director • Engineer | 24 Oct 2012←13 Years→Current | Active | |
| Nuclear Ventilation Systems Limited Director • Engineer | 24 Oct 2012←13 Years→Current | Active | |
| Nuclear Ventilation Projects Limited Director • Engineer | 7 Dec 2011←14 Years→Current | Active | |
| Parker Nuclear Services UK Limited Director • Engineer | 7 Dec 2011←14 Years→Current | Active | |
| Nuclear Manufacturing Projects Limited Director • Engineer | 7 Dec 2011←14 Years→Current | Active | |
| Nuclear Manufacturing Services Limited Director • Engineer | 7 Dec 2011←14 Years→Current | Active | |
| Parker Environmental Services Limited Director • Engineer | 21 Jun 2002←23 Years→Current | Active | |
