| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Groundwork Environmental Services (Thames Valley) Ltd | 02672807 | 05/05/1998 | Dissolved |
| Ricar Ltd | 01980090 | 24/01/1991 | Dissolved |
| THE STOWE HOUSE PRESERVATION TRUST | 03394958 | 18/06/2008 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BLUE SKY DEVELOPMENT AND REGENERATION | 05639379 | 10/02/2012 | 01/10/2014 | Dissolved |
| BLUE SKY NORTH | 08615122 | 18/07/2013 | 14/08/2015 | Dissolved |
| GROUNDWORK ENTERPRISES LIMITED | 02403588 | 28/10/2004 | 16/09/2010 | Not Trading |
| Groundwork Environmental Services (Thames Valley) Ltd | 02672807 | 17/10/2003 | 24/09/2004 | Dissolved |
| NATIONAL COUNCIL FOR VOLUNTARY ORGANISATIONS(THE) | 00198344 | 04/12/1991 | 20/01/1994 | Silver |
| THE FEDERATION OF GROUNDWORK TRUSTS | 01900511 | 15/11/1992 | 26/09/1995 | Bronze |
| THE GROUNDWORK SOUTH TRUST LIMITED | 01982077 | 17/10/2003 | 30/01/2004 | Amber |
| THE GROUNDWORK SOUTH TRUST LIMITED | 01982077 | 14/03/2017 | 03/05/2018 | Amber |
| THE LAND RESTORATION TRUST | 05077263 | 06/04/2004 | 01/06/2010 | Silver |
| TRUST FOR URBAN ECOLOGY | 01446653 | 17/12/1992 | 16/05/1996 | Dissolved |