| Company | Timeline | Status | |
| SRB Quantum Limited Director • Unreported | 31 Oct 2016←9 Years→Current | Active | |
| South Coast Mastics Limited Director • Unreported | 17 Sep 2010←15 Years→Current | Active | |
| GPB (Mastics) Ltd Director • Unreported | 1 Sep 2010←15 Years→Current | Active | |
| 41, Enys Road Residents Association Limited Director • Unreported | 1 Apr 2007←18 Years→Current | Active | |
David Johns Associates Construction Limited Director • Director | 25 May 2006←9 Years→6 Feb 2016 | Dissolved | |
David Johns Associates Contractors Limited Director • Director | 8 May 2006←13 Years→15 Oct 2019 | Dissolved | |
| A & L Draincare Limited Director • Director | 29 Apr 2002←1 Year 5 Months→5 Oct 2003 | Active | |
| David Johns Associates Consultants Limited Director • Quantity Surveyor | 19 Aug 1999←23 Years→30 Apr 2023 | Dissolved | |
David Johns Associates Limited Director • Quantity Surveyor | 13 Nov 1997←17 Years→11 Feb 2015 | Dissolved | |
