| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| PROJECT HOUGOUMONT LIMITED | 07043137 | 18/06/2014 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ARUNDEL CASTLE TRUSTEES LIMITED | 01269400 | 16/05/1992 | 08/02/1995 | Gold |
| HERITAGE OF LONDON TRUST LIMITED(THE) | 01485287 | 01/01/1996 | 14/10/2008 | Bronze |
| LANDMARK TRADING SHOTTESBROOKE LIMITED | 03806682 | 16/06/2011 | 24/11/2011 | Not Trading |
| NATIONAL TRUST (ENTERPRISES) LIMITED (THE) | 01083105 | 30/08/1992 | 27/11/2000 | Amber |
| RE-FORM HERITAGE | 03290459 | 27/11/2003 | 14/12/2004 | Bronze |
| THE GOLDSMITHS' CENTRE | 06288800 | 21/06/2007 | 08/05/2013 | Silver |
| THE GOLDSMITHS' COMPANY CHARITY | 11048746 | 01/04/2018 | 31/03/2019 | Bronze |
| THE GOLDSMITHS' COMPANY TRUSTEE | 07343075 | 22/12/2010 | 14/08/2018 | Dissolved |
| THE LANDMARK TRUST (AUCHINLECK) LIMITED | 03586531 | 18/06/1998 | 21/10/2019 | Amber |
| THE LANDMARK TRUSTEE COMPANY LIMITED | 02384569 | 16/05/1991 | 24/11/2011 | Amber |
| THE LUNDY COMPANY LIMITED | 00960421 | 07/03/1994 | 18/04/1997 | Bronze |
| THE SOCIETY FOR THE PROTECTION OF ANCIENT BUILDINGS | 05743962 | 05/09/2006 | 03/09/2014 | Gold |
| THE STRAWBERRY HILL COLLECTION TRUST | 06851597 | 05/04/2011 | 10/02/2021 | Silver |
| UK OVERSEAS TERRITORIES CONSERVATION FORUM | 03216892 | 28/09/2000 | 18/10/2005 | Gold |