| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALLIANCE MEDICAL GROUP LIMITED | 06412789 | 27/02/2024 | Bronze |
| COURTENAY GATE LAWNS LIMITED | 02303086 | 18/10/2022 | Silver |
| GD SOLUTIONS GUILDFORD LTD | 08006007 | 26/03/2012 | Dissolved |
| Petnet Solutions Ltd | 04785815 | 27/09/2005 | Dissolved |
| Siemens Molecular Imaging Holdings Ltd | 04735077 | 27/09/2005 | Dissolved |
| Ulster X-Ray Ltd | 01944509 | 27/03/1995 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ADAPTIX LIMITED | 06857417 | 22/04/2013 | 31/12/2019 | One Red Flag |
| METIER HEALTHCARE LIMITED | 03302891 | 05/02/1999 | 18/08/1999 | Silver |
| METIER HOLDINGS LIMITED | 03672924 | 05/02/1999 | 18/08/1999 | Silver |
| RADIOLOGY AND ONCOLOGY CONGRESSES | 04075344 | 24/03/2015 | 08/10/2018 | Silver |
| ROC EVENTS LIMITED | 06722032 | 24/03/2015 | 08/10/2018 | Silver |
| SIEMENS HEALTHCARE DIAGNOSTICS LTD | 03050664 | 31/07/2008 | 15/08/2011 | Silver |
| SIEMENS HOLDINGS PLC | 02465263 | 01/10/2002 | 31/03/2012 | Silver |
| SIEMENS PUBLIC LIMITED COMPANY | 00727817 | 01/10/1994 | 31/03/2012 | Silver |
| Siemens Healthcare Services Ltd | 03406488 | 17/09/2001 | 31/10/2002 | Dissolved |
| Siemens Magnet Technology Ltd | 02342055 | 27/06/1994 | 11/12/2009 | Dissolved |
| THE NATIONAL HOSPITAL FOR NEUROLOGY AND NEUROSURGERY DEVELOPMENT FOUNDATION | 01844281 | 18/07/1996 | 08/07/1999 | Silver |
| WS AUDIOLOGY LIMITED | 00203774 | 02/06/2004 | 31/03/2012 | Silver |