| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AKTIUS LTD | 08468013 | 02/04/2013 | Amber |
| COLEMAN CONSTRUCTION & UTILITIES LIMITED | 03935129 | 29/10/2024 | Gold |
| Costain Trade & Services Ltd | 02196822 | 15/12/2003 | Dissolved |
| NEXUS INFRASTRUCTURE PLC | 05635505 | 03/02/2023 | Silver |
| NEXUS PARK LIMITED | 11994950 | 01/02/2023 | One Red Flag |
| TAMDOWN GROUP LIMITED | 01268060 | 15/09/2016 | One Red Flag |
| TAMDOWN PLANT HIRE LIMITED | 03965045 | 03/02/2023 | Silver |
| TAMDOWN SERVICES LIMITED | 03849193 | 03/02/2023 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| COSTAIN OIL, GAS & PROCESS (OVERSEAS) LIMITED | 00583789 | 01/12/2003 | 30/11/2012 | Not Trading |
| COSTAIN OIL, GAS & PROCESS LIMITED | 00786418 | 01/12/2003 | 30/11/2012 | One Red Flag |
| COSTAIN PETROFAC LIMITED | 04790236 | 16/12/2003 | 02/06/2009 | Dissolved |
| COSTAIN UPSTREAM LIMITED | SC336371 | 07/04/2011 | 20/12/2012 | Amber |
| TRICONNEX LTD | 07466247 | 14/09/2016 | 03/02/2023 | One Red Flag |