| Company | Timeline | Status | |
| Barnet Elizabethans Rugby Football Club Limited Director • Retired | 1 May 2010←12 Years→28 Jun 2022 | Active | |
Duncan Clark Associates Limited Director • Financial Consultant | 25 Oct 2001←3 Years→20 May 2005 | Dissolved | |
| D.C. Nominees Limited Director • Financial Consultant | 9 Jul 1992←12 Years→20 May 2005 | Dissolved | |
Duncan Clark Properties Limited Director • Financial Consultant | 18 Jun 1991←13 Years→20 May 2005 | Dissolved | |
| Duncan Clark (Insurance Brokers) Limited Director • Financial Consultant | 17 Jun 1991←13 Years→20 May 2005 | Active | |
| Duncan Clark Limited Director • Financial Consultant | 10 May 1991←13 Years→30 Jun 2004 | Dissolved | |
