| Company | Timeline | Status | |
| Portman Estate Management Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| Berkeley Street Nominees Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| The Portman Estate Nominees (One) Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| The Portman Estate Nominees (Two) Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| 21 Seymour Street Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| Seymour Street Nominees Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| Portman Burtley Estate Company Limited Secretary • Estate Secretary | 10 Jun 2009←16 Years→Current | Active | |
| Red Bee Media Pension Plan Trustee Limited Secretary • Unreported | 29 Jul 2005←3 Years→7 Apr 2009 | Active | |
