| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Green Eden Trust | 03690756 | 31/12/1998 | Dissolved |
| HOWARD ESTATE MANAGEMENT LIMITED | 03063380 | 01/06/1995 | Gold |
| LONSDALE SETTLED ESTATES LIMITED | 05822240 | 09/06/2009 | Bronze |
| M.R.H.MINERALS LIMITED | 00371464 | 28/10/1993 | Silver |
| P H Sporting Ltd | 03743517 | 06/04/1999 | Dissolved |
| WPA DEVELOPMENTS LTD. | 12070685 | 26/06/2019 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CASTLE HOWARD ESTATE LIMITED | 00480214 | 01/02/2013 | 03/08/2020 | Silver |
| LOWTHER CASTLE AND GARDENS TRUST | 06265298 | 30/01/2012 | 01/02/2013 | Gold |