| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ANGLO CHESHAM MANAGEMENT LIMITED | 05226018 | 26/02/2015 | Gold |
| ANGLO INDUSTRIAL HOLDINGS LTD | 07290171 | 21/06/2010 | One Red Flag |
| BROADGATE FREEHOLDS LIMITED | 06880580 | 17/04/2009 | One Red Flag |
| ENERGY CAPITAL ADVISERS LTD | 07589754 | 04/04/2011 | Silver |
| GROUND RENT ADVANTAGE PLC | 07958758 | 26/02/2012 | Dissolved |
| HORIZON (GP) LIMITED | SC493523 | 16/12/2014 | Silver |
| HORIZON HOUSING REIT PLC | 11283973 | 22/05/2019 | Silver |
| HORIZON HUDSON HOLDINGS LTD | 11718138 | 07/12/2018 | Not Trading |
| HORIZON INFRASTRUCTURE PARTNERSHIP LIMITED | 09558425 | 23/04/2015 | Silver |
| HORIZON LOANS LIMITED | 09645317 | 08/12/2023 | Silver |
| HORIZON SCOTLAND (GP) LIMITED | SC593662 | 06/04/2018 | Not Trading |
| HOUSING INVESTMENT FINANCE LTD | 08390316 | 05/02/2013 | Not Trading |
| INFRASTRUCTURE PARTNERSHIP LLP | OC386492 | 09/07/2013 | Bronze |
| SUSTAINABLE INFRASTRUCTURE PARTNERSHIP LTD | 07031554 | 18/10/2010 | Not Trading |
| SUSTAINABLE INVESTMENT PARTNERS UK LIMITED | 07025972 | 22/09/2009 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ECG (CAPITAL) LIMITED | 05596241 | 18/01/2008 | 09/05/2008 | Dissolved |
| ECOCENTROGEN LIMITED | 05064411 | 13/09/2007 | 14/05/2008 | Dissolved |
| GRIPWORX HOLDINGS LIMITED | 05363111 | 20/05/2008 | 01/11/2024 | One Red Flag |
| HORIZON HOUSING REIT PLC | 11283973 | 29/03/2018 | 11/04/2018 | Silver |
| HORIZON INVESTMENT HOLDINGS (ONE) LIMITED | 11284154 | 29/03/2018 | 11/04/2018 | Amber |
| HORIZON INVESTMENT HOLDINGS (TWO) LIMITED | 11284232 | 29/03/2018 | 11/04/2018 | Amber |
| HORIZON INVESTMENTS (ONE) LIMITED | 11284520 | 29/03/2018 | 11/04/2018 | Not Trading |
| HORIZON INVESTMENTS (TWO) LIMITED | 11284512 | 29/03/2018 | 11/04/2018 | Not Trading |
| LOUDWATER (TROUT RISE FARM) LIMITED | 09311087 | 13/01/2020 | 29/08/2022 | Bronze |
| LOUDWATER (TROUTSTREAM) ESTATE LIMITED | 00580947 | 13/01/2020 | 29/08/2022 | Silver |
| LOUDWATER FREEHOLD ESTATES LIMITED | 06515590 | 13/01/2020 | 29/08/2022 | One Red Flag |
| WATFORD GRAMMAR SCHOOL FOR GIRLS | 07348254 | 19/03/2015 | 07/09/2021 | Silver |
| WATFORD GRAMMAR SCHOOL FOR GIRLS SERVICES LTD | 08823700 | 01/09/2016 | 15/11/2022 | One Red Flag |