| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BEAM CONNECTIVITY LIMITED | 12429245 | 17/04/2023 | Silver |
| MILLBROOK GROUP LIMITED | 08696904 | 24/08/2017 | Dissolved |
| MILLBROOK TDC LTD | 03815588 | 24/04/2014 | Dissolved |
| MPG BIDCO LIMITED | 08680151 | 12/02/2014 | Dissolved |
| MPG MIDCO LIMITED | 08696900 | 12/02/2014 | Dissolved |
| ROBERT HARTER LIMITED | 08608720 | 15/07/2013 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CFMS LIMITED | 06477281 | 18/01/2008 | 04/11/2011 | Silver |
| FLEXION ENERGY HOLDINGS UK LTD | 13492974 | 07/10/2021 | 22/08/2024 | Silver |
| FLEXION ENERGY UK STORAGE LTD | 13492210 | 07/10/2021 | 22/08/2024 | Silver |
| FORTESCUE ZERO LIMITED | 08012215 | 29/03/2012 | 29/05/2013 | Amber |
| GKN HYBRID POWER LIMITED | 06005208 | 28/03/2008 | 29/05/2013 | One Red Flag |
| MILLBROOK GROUP LIMITED | 08696904 | 19/02/2014 | 23/08/2017 | Dissolved |
| THE LEAFIELD FOX LIMITED | 11060120 | 13/11/2017 | 31/10/2019 | Dissolved |
| UTAC SPECIAL VEHICLES UK LTD | 11025363 | 23/10/2017 | 18/09/2020 | One Red Flag |
| UTAC UK HOLDINGS LTD | 09657741 | 26/06/2015 | 18/09/2020 | Silver |
| UTAC UK LTD | 02230262 | 12/02/2014 | 18/09/2020 | Amber |
| WGP TRUSTEES LIMITED | 07501975 | 21/01/2011 | 29/05/2013 | Not Trading |
| WILLIAMS GRAND PRIX ENGINEERING LIMITED | 01297497 | 18/09/2008 | 29/05/2013 | Amber |
| WILLIAMS GRAND PRIX HOLDINGS PLC | 07475805 | 21/12/2010 | 29/05/2013 | Insolvent |