| Company | Timeline | Status | |
| Hartman Engineering (Holdings) Limited Director • Unreported | 13 Nov 2007←18 Years→Current | Active | |
| Hartman Engineering (Properties) LLP Designated LLP Member • Unreported | 12 Nov 2007←18 Years→Current | Active | |
| Hartman Engineering Limited Director • Engineer | 14 Mar 2000←25 Years→Current | Active | |
