| Company | Timeline | Status | |
| Relay International Group Limited Director • Unreported | 28 Mar 2023←2 Years 7 Months→Current | Active | |
| Hazco Environmental Limited Director • Chief Executive | 10 Sep 2021←4 Years→Current | Active | |
| Denholm Macnamee Limited Director • Chief Executive | 10 Sep 2021←4 Years→Current | Active | |
| Industrial Air Power Limited Director • Unreported | 3 Feb 2016←9 Years→Current | Active | |
| Denholm Engineering Limited Director • Company Director | 17 Jul 2015←10 Years→Current | Active | |
| KSW Engineering Limited Director • Company Director | 25 Jun 2015←10 Years→Current | Active | |
| Denholm Energy Services Limited Director • None | 21 Aug 2014←11 Years→Current | Active | |
| Turner & Hickman Limited Director • Company Director | 5 Nov 2013←12 Years→Current | Active | |
| Denholm Environmental Limited Director • Company Director | 4 Sep 2012←13 Years→Current | Active | |
| Petrasco Services Limited Director • Company Director | 6 Dec 2011←13 Years→Current | Active | |
