| Company | Timeline | Status | |
| Zero-C Offshore Construction Limited Director • Cto | 5 Jun 2023←2 Years 6 Months→2 Dec 2025 | Dissolved | |
| Houlder Engineering Group Limited Director • Chief Technical Officer | 28 Dec 2011←6 Years→5 Oct 2018 | Active | |
| Houlder Investments Limited Director • Engineer | 14 Dec 2007←10 Years→5 Oct 2018 | Active | |
| Houlder Offshore Limited Director • Chief Technical Officer | 14 Dec 2007←10 Years→5 Oct 2018 | Active | |
| Hart, Fenton & Co Limited Director • Engineer | 6 Oct 2006←12 Years→5 Oct 2018 | Active | |
| Seaspeed Marine Consulting Limited Director • Engineer | 15 Nov 2004←13 Years→5 Oct 2018 | Active | |
| Houlder Limited Director • Engineer | 13 Jun 2003←15 Years→3 Sep 2018 | Active | |
