| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ISLE OF WIGHT FOUNDATION | 08804485 | 02/08/2016 | Amber |
| VINCI UK FOUNDATION | 09639905 | 20/12/2021 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ECO-ASPHALT LIMITED | 02759165 | 05/01/2004 | 01/08/2008 | Not Trading |
| Federation of Road Surface Treatment Associations Ltd | 04652862 | 30/01/2003 | 12/06/2007 | Dissolved |
| INSTITUTE OF HIGHWAY ENGINEERS | 01064239 | 20/06/1998 | 20/06/2003 | Gold |
| RINGWAY HOUNSLOW HIGHWAYS LIMITED | 08078973 | 24/04/2013 | 18/06/2021 | Silver |
| RINGWAY INFRASTRUCTURE SERVICES LIMITED | 02756434 | 01/01/2008 | 18/06/2021 | Silver |
| RINGWAY ISLAND ROADS LIMITED | 08108944 | 02/02/2016 | 18/06/2021 | One Red Flag |
| THE ROAD SURFACE TREATMENTS ASSOCIATION LIMITED | 00375993 | 31/03/2005 | 08/06/2016 | Gold |