| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| SHELDON ERSKINE LIMITED | 06694052 | 10/09/2008 | Dissolved |
| ST. HILDA'S EDUCATIONAL TRUST LIMITED | 00677844 | 17/02/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BEACONSFIELD EDUCATIONAL TRUST LIMITED | 00717500 | 08/11/2005 | 05/07/2018 | Silver |
| DR CHALLONER'S GRAMMAR SCHOOL | 07451811 | 15/07/2016 | 05/12/2022 | Silver |
| JOHN HAMPDEN GRAMMAR SCHOOL | 07638999 | 06/06/2011 | 31/08/2016 | Silver |
| ST.PIRAN'S SCHOOL LIMITED | 01047287 | 13/03/2013 | 07/09/2017 | Silver |
| THE ALDENHAM FOUNDATION | 01847134 | 08/12/2009 | 11/12/2018 | Gold |
| THE CAUSEWAY FOUNDATION | 07461101 | 12/02/2014 | 18/11/2015 | Dissolved |
| WATFORD GRAMMAR SCHOOL FOR BOYS | 07348288 | 14/11/2015 | 31/08/2024 | Bronze |