| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALWAYS TRYING LTD | SC389948 | 06/12/2010 | Not Trading |
| FRIAR INGS STUD LTD | SC470409 | 19/02/2014 | One Red Flag |
| GLENBEAGLES LTD | SC638334 | 08/08/2019 | Not Trading |
| JOHNSTON RACING LIMITED | SC106428 | 06/02/1990 | Gold |
| JOHNSTON RACING LIMITED | SC106428 | 06/02/1990 | Gold |
| KINGSLEY PARK RACING LTD | SC470410 | 19/02/2014 | Not Trading |
| KIRKGATE LIMITED | SC194712 | 29/03/1999 | Not Trading |
| RACE RIDERS CAFE LIMITED | SC232707 | 13/06/2002 | Not Trading |
| RACE RIDERS LIMITED | SC169161 | 14/10/1996 | Not Trading |
| THE HAMILTON PARK RACECOURSE COMPANY LIMITED | SC012899 | 12/02/2004 | Silver |
| THE HAMILTON PARK RACECOURSE HOTEL COMPANY LIMITED | SC583881 | 13/12/2023 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRITISH HORSERACING AUTHORITY LIMITED | 02813358 | 11/04/2011 | 31/07/2014 | Gold |
| CHARLIE JOHNSTON RACING LIMITED | SC314733 | 16/01/2007 | 25/05/2018 | Not Trading |
| MIDDLEHAM KEY CENTRE LIMITED | 03222165 | 09/07/1996 | 01/01/1999 | Silver |
| Middleham Key Partnership (Trading) Ltd | 03189974 | 02/08/1996 | 01/01/1999 | Dissolved |
| Middleham Key Partnership Ltd | 03055583 | 11/05/1995 | 01/01/1999 | Dissolved |
| Northern Thoroughbreds Ltd | 04165119 | 16/03/2001 | 16/06/2001 | Dissolved |
| THE RACING FOUNDATION | 07890908 | 01/01/2017 | 31/12/2022 | Silver |