| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BABCOCK PENSION TRUST LIMITED | 00357329 | 31/05/2018 | Not Trading |
| Bnfl Enterprise Ltd | 02287441 | 20/12/2001 | Dissolved |
| GREAT BRITISH NUCLEAR | 05027024 | 03/11/2023 | Silver |
| MAGNOX ELECTRIC GROUP PENSION TRUSTEE COMPANY LIMITED | 04037100 | 01/02/2013 | Amber |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BNFL (INVESTMENTS US) LIMITED | 04394408 | 30/06/2008 | 30/09/2009 | Silver |
| BRITISH NUCLEAR GROUP LIMITED | 05245506 | 30/06/2008 | 30/09/2009 | Silver |
| Bnfl Enterprise Ltd | 02287441 | 24/11/1998 | 23/04/1999 | Dissolved |
| CAVENDISH FLUOR PARTNERSHIP LIMITED | 08980374 | 31/08/2017 | 27/06/2019 | Amber |
| DOUNREAY SITE RESTORATION LIMITED | SC307493 | 01/10/2019 | 01/04/2023 | Bronze |
| FEELGOOD THEATRE PRODUCTIONS | 03358285 | 15/12/2009 | 01/11/2017 | Amber |
| Fellside Heat & Power Ltd | 02614535 | 27/05/1998 | 01/08/2002 | Dissolved |
| INNOVATION SQUARED LIMITED | 03713222 | 06/02/2002 | 26/04/2004 | Dissolved |
| NATIONAL NUCLEAR LABORATORY LIMITED | 03857752 | 22/07/2008 | 07/09/2009 | Silver |
| NEOS NUCLEAR LIMITED | 02763400 | 21/11/1997 | 18/01/2008 | Insolvent |
| NUCLEAR RESTORATION SERVICES LIMITED | 02264251 | 01/01/2012 | 01/10/2024 | Amber |
| RIVERSIDE CONSULTANCY SERVICES LIMITED | 04136839 | 01/04/2010 | 09/02/2019 | Bronze |
| RIVERSIDE ESTUARY LIMITED | 04025897 | 10/02/2010 | 23/04/2015 | Silver |
| RIVERSIDE FINANCE PLC | 09225450 | 18/09/2014 | 09/02/2019 | Bronze |
| RIVERSIDE GROUP PENSION TRUSTEES LIMITED | 01379927 | 14/04/2010 | 31/03/2018 | Amber |
| RIVERSIDE URBAN SERVICES LTD | 01649628 | 10/02/2010 | 09/02/2019 | Dissolved |
| SELLAFIELD LIMITED | 01002607 | 01/07/2008 | 24/11/2008 | Amber |
| THE SUTTON ACADEMY | 07103919 | 13/12/2012 | 19/09/2019 | Gold |
| WATERSIDE TRAINING LIMITED | 03140204 | 27/08/2009 | 05/09/2014 | Bronze |
| WESTLAKES SCIENTIFIC CONSULTING LIMITED | 02703128 | 05/09/1997 | 31/03/2001 | Dissolved |