| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ACTIVE POWER SYSTEMS LTD | SC655094 | 19/02/2020 | Dissolved |
| C3 Nuclear Ltd | 06371298 | 14/09/2007 | Dissolved |
| IONIAN PELLO TECHNOLOGIES LIMITED | 12453715 | 10/02/2020 | Not Trading |
| NUCLEAR MANAGEMENT PARTNERS LIMITED | 05894268 | 22/12/2010 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMENTUM (UK) LTD. | 03909808 | 21/05/2012 | 10/09/2019 | Bronze |
| AMENTUM INTERNATIONAL HOLDINGS UK LTD. | 00530311 | 13/12/2013 | 10/09/2019 | Bronze |
| CAVENDISH DOUNREAY PARTNERSHIP LIMITED | 07868218 | 26/07/2012 | 14/11/2019 | Gold |
| ENERGY COAST WEST CUMBRIA (PROPERTIES) LIMITED | 02414283 | 14/12/2012 | 20/05/2015 | Bronze |
| ENERGY COAST WEST CUMBRIA LIMITED | 02234442 | 21/04/2011 | 20/05/2015 | Silver |
| GENII ENGINEERING & TECHNOLOGY TRAINING LIMITED | 03804696 | 05/12/2006 | 31/08/2010 | Bronze |
| IONIAN PELLO TECH LIMITED | 11109773 | 04/04/2021 | 27/10/2022 | Amber |
| NUCLEAR INDUSTRY ASSOCIATION | 02804518 | 23/06/2016 | 12/11/2019 | Silver |
| NUCLEAR MANAGEMENT PARTNERS LIMITED | 05894268 | 25/03/2008 | 10/08/2010 | Dissolved |
| NUCLEUS TRAINING LIMITED | 05698334 | 30/06/2010 | 31/08/2010 | Dissolved |
| STORNOWAY WIND FARM LIMITED | SC225262 | 01/08/2009 | 05/08/2010 | Amber |
| UK NUCLEAR WASTE MANAGEMENT LIMITED | 06040606 | 04/04/2012 | 20/10/2019 | Amber |