| Company | Timeline | Status | |
| LTJMB Holdings Limited Director • Geotechnical Engineer | 6 Aug 2015←4 Years→17 Dec 2019 | Active | |
| Geotechnics Special Projects Limited Director • Director | 5 Mar 2007←18 Years→Current | Active | |
Geotechnics Archaeology Limited Director • Director | 5 Mar 2007←9 Years→20 Sep 2016 | Dissolved | |
Geotechnics Consultancy Limited Director • Director | 5 Mar 2007←9 Years→19 Jul 2016 | Dissolved | |
| Geotechnics Consulting Limited Director • Director | 2 Mar 2007←18 Years→Current | Active | |
Geotechnics Surveys Limited Director • Director | 2 Mar 2007←9 Years→19 Jul 2016 | Dissolved | |
Geotechnics Environment Limited Director • Geotechnical Engineer | 3 Jul 2006←10 Years→19 Jul 2016 | Dissolved | |
Geoenvironment Limited Director • Geotechnical Engineer | 3 Jul 2006←10 Years→19 Jul 2016 | Dissolved | |
| Geotechnics Environmental Limited Director • Geotechnical Engineer | 3 Jul 2006←19 Years→Current | Active | |
| Leonard Threadgold Limited Director • Consultant | 29 Jun 1994←31 Years→Current | Active | |
