| Company | Timeline | Status | |
| Woodruff Farm Ltd Director • Farmer | 7 Jun 2010←7 Years→12 Jun 2017 | Dissolved | |
| Particle Therapeutics Limited Director • Farmer Retd Academic | 8 Mar 2006←8 Years→10 May 2014 | Active | |
| Magdalen College School Oxford Limited Director • Professor | 1 Apr 1999←8 Years→29 Nov 2007 | Active | |
Chiron Pharmaceuticals Limited Director • University Reader | 8 Apr 1997←6 Years→8 Jul 2003 | Dissolved | |
| Powderject Research Limited Director • University Lecturer | 12 Jul 1993←3 Years→8 Apr 1997 | Dissolved | |
| Surgical Innovations Group Plc Director • University Lecturer | 5 Mar 1992←2 Months→13 May 1992 | Active | |
| The Oxford Science Park Limited Director • University Lecturer | 21 Jan 1992←12 Years→31 Jan 2004 | Active | |
