| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMBA DEFENCE CONTROL LTD | 05753656 | 15/04/2010 | 27/03/2013 | Dissolved |
| AMBA DEFENCE SOLUTIONS LTD | 04223880 | 18/05/2007 | 27/03/2013 | Dissolved |
| BANBURY MASONIC BUILDINGS COMPANY LIMITED | 00903016 | 28/02/2007 | 17/04/2024 | Silver |
| CTAC LIMITED | 04994638 | 15/04/2010 | 11/12/2023 | Not Trading |
| KATHARINE HOUSE HOSPICE TRUST | 02133391 | 01/03/2008 | 12/03/2020 | Silver |
| LONGMOOR SECURITY SERVICES LIMITED | 07729757 | 05/09/2016 | 11/12/2023 | Not Trading |
| MENVIER LIMITED | 01196146 | 30/08/1991 | 30/04/1999 | Dissolved |
| SOVEREIGN FERRIES LIMITED | 09170338 | 01/10/2014 | 11/12/2023 | Silver |
| WESTMINSTER AVIATION SECURITY SERVICES LIMITED | 04030072 | 07/06/2004 | 27/02/2005 | Gold |
| WESTMINSTER GROUP PLC | 03967650 | 07/06/2004 | 27/02/2005 | Silver |
| WESTMINSTER INTERNATIONAL LIMITED | 04090560 | 23/10/2000 | 11/12/2023 | Amber |
| WESTMINSTER JV HOLDINGS LTD | 10198123 | 18/08/2016 | 13/10/2016 | Dissolved |
| WESTMINSTER MARITIME SERVICES LTD | 05135771 | 07/06/2004 | 11/12/2023 | Not Trading |
| WESTMINSTER OPERATING LIMITED | 08566914 | 12/06/2013 | 11/12/2023 | Amber |
| WESTMINSTER SERVICES LIMITED | 05428232 | 25/02/2009 | 19/04/2024 | One Red Flag |
| Westminster Fire Ltd | 03608484 | 04/01/2000 | 19/10/2000 | Dissolved |
| Westminster Security Group Ltd | 03162557 | 21/07/1999 | 19/10/2000 | Dissolved |
| Westminster Security Systems Ltd | 02231747 | 21/04/1999 | 19/10/2000 | Dissolved |