| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ASBESTOS AWARENESS AND IDENTIFICATION SERVICES LIMITED | 04624232 | 15/06/2005 | Gold |
| BRAWLEY CONSTRUCTION LIMITED | 06099950 | 13/02/2007 | Gold |
| BRAWLEY CONSTRUCTION LIMITED | 06099950 | 13/02/2007 | Gold |
| C SPENCER ENVIRONMENTAL LIMITED | 05356593 | 08/02/2005 | Gold |
| C SPENCER LIMITED | 02334308 | 14/05/1991 | Silver |
| DARKSTAR ENERGY LIMITED | 07455937 | 01/12/2010 | Gold |
| ENERGY WORKS (HULL) LIMITED | 07829330 | 31/10/2011 | One Red Flag |
| EWH FINCO LIMITED | 09856871 | 10/11/2015 | One Red Flag |
| EWH HOLDCO LIMITED | 09856394 | 10/11/2015 | One Red Flag |
| Hardgrafters Ltd | 05736505 | 09/03/2006 | Dissolved |
| OUTSOURCE RESOURCE LIMITED | 05736522 | 09/03/2006 | Gold |
| R D ENTERPRISES LIMITED | 09261471 | 13/10/2014 | Dissolved |
| SPENCER BRIDGE ENGINEERING LIMITED | 08053188 | 01/05/2012 | Silver |
| SPENCER BUILDING & CIVIL ENGINEERING LTD | 08055182 | 02/05/2012 | Gold |
| SPENCER DIGITAL SERVICES LTD | 08179803 | 14/08/2012 | Gold |
| SPENCER ENGINEERING GROUP LIMITED | 08670410 | 30/08/2013 | Bronze |
| SPENCER PROFESSIONAL SERVICES LIMITED | 08053359 | 01/05/2012 | Gold |
| SPENCER RAIL LIMITED | 08254101 | 16/10/2012 | Gold |
| SPENCER RESOURCES LIMITED | 08254211 | 16/10/2012 | Gold |
| Sero Connections Ltd | 06281879 | 15/06/2007 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| SLIPFORM ENGINEERING LTD | 08253976 | 15/10/2012 | 21/03/2023 | Bronze |
| THE RON DEARING UTC | 10009591 | 17/02/2016 | 31/08/2024 | Silver |