| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| W3M (Trading) Ltd | 03603013 | 19/09/2002 | Dissolved |
| W3M Charitable Foundation | 03653348 | 19/09/2002 | Dissolved |
| Whitehaven Development Co Ltd | 02671247 | 19/09/2002 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMENTUM INTERNATIONAL NUCLEAR SERVICES LIMITED | 05532606 | 03/06/2019 | 30/11/2020 | Silver |
| DEFENCE CONTRACTOR MANAGEMENT AND OPERATIONS LIMITED | 03664571 | 09/08/2017 | 01/10/2020 | Not Trading |
| JACOBS U.K. LIMITED | 02594504 | 18/11/2016 | 30/11/2020 | Bronze |
| JACOBS UK HOLDINGS LIMITED | 04420029 | 08/11/2017 | 03/06/2019 | Gold |
| JEG ACQUISITION COMPANY LIMITED | 06678113 | 08/11/2017 | 30/11/2020 | Silver |
| NUCLEAR WASTE SERVICES LIMITED | 05608448 | 01/09/2007 | 01/04/2008 | Amber |