| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ROYAL SOCIETY FOR THE PREVENTION OF ACCIDENTS(THE) | 00231435 | 13/11/2009 | Silver |
| THE UNIVERSITIES AND COLLEGES EMPLOYERS' ASSOCIATION | 02914327 | 01/08/2021 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRITISH NUCLEAR GROUP LIMITED | 05245506 | 01/04/2005 | 30/06/2009 | Silver |
| CAVENDISH NUCLEAR (OVERSEAS) LIMITED | 05339062 | 16/01/2007 | 18/01/2008 | Not Trading |
| DEFENCE CONTRACTOR MANAGEMENT AND OPERATIONS LIMITED | 03664571 | 01/07/2008 | 07/05/2009 | Not Trading |
| GREAT BRITISH NUCLEAR | 05027024 | 17/03/2005 | 30/06/2009 | Silver |
| INVENSYS LIMITED | 00166023 | 24/05/2006 | 17/01/2014 | Gold |
| LAIRD LIMITED | 00055513 | 03/03/2015 | 29/06/2018 | Silver |
| LIVERPOOL LAND DEVELOPMENT COMPANY LIMITED | 04710666 | 30/04/2008 | 29/11/2012 | Dissolved |
| LIVERPOOL VISION LIMITED | 06580889 | 30/04/2008 | 29/11/2012 | Dissolved |
| NUCLEAR RESTORATION SERVICES LIMITED | 02264251 | 15/02/2007 | 26/06/2007 | Amber |
| PV CRYSTALOX SOLAR PLC | 06019466 | 01/01/2010 | 09/10/2020 | Amber |
| SELLAFIELD LIMITED | 01002607 | 15/02/2007 | 24/11/2008 | Silver |
| UNITED KINGDOM NATIONAL NUCLEAR LABORATORY LIMITED | 03857752 | 01/04/2005 | 03/04/2009 | Silver |
| URENCO LIMITED | 01022786 | 29/09/2003 | 01/01/2009 | Silver |