| Company | Timeline | Status | |
| H3C Ltd Director • Unreported | 13 May 2025←6 Months→Current | Active | |
| DH Fea Limited Director • Unreported | 7 Mar 2024←1 Year 8 Months→Current | Active | |
David H Design Ltd Director • Oil & Gas Engineering | 18 Mar 2016←4 Years→10 Nov 2020 | Dissolved | |
Dhsubsea Limited Director • Director | 22 Jul 2015←5 Years→6 Oct 2020 | Dissolved | |
Lamas Engineering Ltd Director • Consultant | 11 Apr 2007←12 Years→2 Oct 2019 | Dissolved | |
