| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ACRE 1127 LIMITED | 01639743 | 25/04/2005 | Dissolved |
| ARTICA GALLERIES LIMITED | 05686433 | 07/06/2010 | Not Trading |
| CASTLE GALLERIES RETAIL LIMITED | 06894487 | 28/05/2009 | Not Trading |
| Firhill Plantation Llp | OC310931 | 10/01/2005 | Dissolved |
| HALCYON ART PUBLISHING LIMITED | 14405137 | 07/10/2022 | Not Trading |
| HALCYON FINE ART GROUP HOLDINGS LIMITED | 07230522 | 21/04/2010 | Bronze |
| HALCYON FINE ART GROUP LIMITED | 03319690 | 01/04/2005 | Silver |
| HALCYON GALLERY (HOLDINGS) LIMITED | 02562112 | 11/02/2020 | Silver |
| MILLYARD BUSINESS SERVICES LIMITED | 03547770 | 17/04/1998 | Dissolved |
| OXFORD (ISIS) LLP | OC312793 | 18/04/2005 | Dissolved |
| Oxford (Boars Hill) Llp | OC306409 | 23/12/2003 | Dissolved |
| PROTOCOL MANAGEMENT SOLUTIONS LIMITED | 03842204 | 01/01/2001 | Strike Off |
| S & S INVESTMENT PROPERTIES LIMITED | 03011224 | 20/01/1995 | Dissolved |
| THE HALCYON GALLERY LIMITED | 02542729 | 30/06/2017 | Silver |
| WASHINGTON GREEN FINE ART GROUP LIMITED | 02001847 | 06/04/2017 | Bronze |
| WASHINGTON GREEN RETAIL LIMITED | 06910082 | 26/05/2009 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| PROTOCOL PROPERTIES LIMITED | 04642574 | 21/01/2003 | 31/12/2003 | Dissolved |