| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CAMCO INTERNATIONAL LIMITED | 04815175 | 20/03/2009 | Dissolved |
| ESD CARBON SERVICES LIMITED | 04135993 | 29/01/2009 | Dissolved |
| LOW CARBON ENGINES LIMITED | 04524640 | 12/12/2012 | Dissolved |
| NORTHAMPTON PLATING WORKS LIMITED | 09902476 | 04/12/2015 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAMCO HOLDINGS UK LIMITED | 03952061 | 29/01/2009 | 29/11/2019 | Bronze |
| CAMCO SALES LIMITED | 06653352 | 22/07/2008 | 31/05/2018 | Dissolved |
| INVINITY ENERGY GROUP SERVICES LIMITED | 05758013 | 27/03/2006 | 29/11/2019 | Gold |
| RE-FUEL TECHNOLOGY LIMITED | 03955925 | 29/01/2009 | 29/11/2019 | Bronze |
| REDT ENERGY HOLDINGS (UK) LIMITED | 05649251 | 01/09/2007 | 29/11/2019 | Gold |
| SERIES Q C.I.C. | 11514488 | 13/08/2018 | 24/11/2022 | Bronze |