| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CENTRE FOR DEVELOPMENT RESULTS | 10010584 | 03/05/2017 | Dissolved |
| REDHILL IMC LTD | 07613779 | 26/04/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASSOCIATION FOR CONSULTANCY AND ENGINEERING | 00132142 | 01/02/2009 | 24/01/2018 | Silver |
| B.ENGLISH TECHNOLOGY LIMITED | 02954622 | 02/08/1994 | 03/11/2003 | Dissolved |
| DT GLOBAL HOLDINGS UK LTD | 09630406 | 09/06/2015 | 30/06/2024 | Bronze |
| DT GLOBAL INTERNATIONAL DEVELOPMENT UK LTD | 02651349 | 10/07/2000 | 30/06/2024 | Bronze |
| IMC WORLDWIDE (HOLDINGS) LIMITED | 07634108 | 13/05/2011 | 07/09/2017 | Dissolved |
| THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE | 08159144 | 24/01/2019 | 26/06/2024 | Gold |
| WSP EUROPEAN HOLDINGS LIMITED | 04121721 | 18/12/2000 | 27/11/2002 | Gold |
| WSP GROUP INTERNATIONAL LIMITED | 02731628 | 09/12/2003 | 14/12/2007 | Dissolved |