| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BINNIES UK LIMITED | 03163649 | 15/01/2021 | Bronze |
| BMG RESEARCH HOLDINGS LIMITED | 10236510 | 25/01/2023 | One Red Flag |
| BMG RESEARCH LTD | 02841970 | 25/01/2023 | Amber |
| C.R. CIVIL ENGINEERING LIMITED | 03950591 | 02/03/2021 | Bronze |
| CRCE PLANT LIMITED | 10408804 | 02/03/2021 | One Red Flag |
| OPTIMUS PLUS (ABERDEEN) LIMITED | 13866377 | 14/07/2023 | One Red Flag |
| PD & MS (DUNDEE) LIMITED | 07516543 | 14/07/2023 | Not Trading |
| PD&MS HOLDINGS LIMITED | 08451993 | 14/07/2023 | One Red Flag |
| PROEON SYSTEMS LIMITED | 05112628 | 21/07/2022 | Amber |
| PROJECT IRES BIDCO LIMITED | 09114938 | 14/07/2023 | One Red Flag |
| PROJECT IRES TOPCO LIMITED | 09113299 | 14/07/2023 | Amber |
| RICHARD ALLITT ASSOCIATES LIMITED | 03255404 | 01/03/2022 | Amber |
| RSK ENVIRONMENT LIMITED | SC115530 | 24/01/2023 | Silver |
| RSK GROUP LIMITED | 03761340 | 01/02/2021 | Amber |
| RSK RAW LIMITED | 12071477 | 26/06/2019 | One Red Flag |
| SYNERGIE ENVIRON LIMITED | SC370321 | 14/07/2023 | Bronze |
| THE WOODHOUSE PARTNERSHIP LIMITED | 02935938 | 02/06/2023 | Amber |
| W.G.M (ENGINEERING)LIMITED | SC099834 | 01/10/2022 | Silver |
| WATERTRAIN LIMITED | 06401993 | 04/05/2022 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| DVCR GROUP LIMITED | 10212690 | 02/03/2021 | 05/03/2024 | Dissolved |
| GALLIFORD TRY INFRASTRUCTURE LIMITED | SC055775 | 22/10/2008 | 31/12/2017 | Amber |
| GBV JV LIMITED | 08584398 | 25/06/2013 | 09/02/2018 | One Red Flag |
| PENDRAGON HOLDINGS LIMITED | 10212776 | 02/03/2021 | 05/03/2024 | Dissolved |
| PROEON HOLDINGS LIMITED | 11306634 | 21/07/2022 | 24/04/2024 | Dissolved |
| ROCK & ALLUVIUM LIMITED | 01795468 | 08/12/2008 | 08/12/2008 | Silver |
| URBAN VISION PARTNERSHIP LIMITED | 05292634 | 10/07/2015 | 22/03/2018 | Gold |
| WATERTRAIN ACQUISITIONS LIMITED | 08571292 | 04/05/2022 | 05/03/2024 | Dissolved |