| Company | Timeline | Status | |
| Whitaker Turner LLP Designated LLP Member • Unreported | 20 Feb 2015←10 Years→Current | Active | |
| Team John Whitaker Limited Director • Unreported | 21 Dec 2010←14 Years→Current | Active | |
| John Whitaker International Limited Director • Unreported | 24 Dec 1998←26 Years→Current | Active | |
| The British Show Jumping Association Director • Showjumper | 1 Jan 1998←2 Years→1 Jan 2000 | Active | |
