| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BROCKHAMPTON HOLDINGS LIMITED | 02570616 | 01/11/2018 | Gold |
| BROCKHAMPTON PROPERTY INVESTMENTS LIMITED | 02844731 | 01/11/2018 | One Red Flag |
| PORTSMOUTH WATER LIMITED | 02536455 | 01/11/2018 | Silver |
| SOUTH DOWNS CAPITAL LIMITED | 04288161 | 01/11/2018 | Gold |
| SOUTH DOWNS LIMITED | 04251707 | 01/11/2018 | One Red Flag |
| UK WATER INDUSTRY RESEARCH LIMITED | 02862807 | 18/08/2022 | Bronze |
| WATER UK | 03539600 | 31/03/2020 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALDERNEY WATER LIMITED | 05598451 | 01/04/2015 | 01/09/2018 | Dissolved |
| AQUACARE (BWH) LIMITED | 06523232 | 31/03/2017 | 01/09/2018 | Dissolved |
| AVON VALLEY WATER LIMITED | 06691170 | 16/04/2015 | 01/09/2018 | Not Trading |
| BOURNEMOUTH WATER INVESTMENTS LIMITED | 05321147 | 01/04/2015 | 01/09/2018 | Dissolved |
| BOURNEMOUTH WATER LIMITED | 02924312 | 01/04/2015 | 01/09/2018 | Dissolved |
| BWH ENTERPRISES LIMITED | 03764413 | 24/02/2015 | 01/09/2018 | Dissolved |
| INSTITUTE OF WATER | 00539193 | 20/12/2016 | 09/09/2024 | Gold |
| PENNON PENSION TRUSTEES LIMITED | 02388620 | 26/06/2017 | 24/07/2018 | Not Trading |
| PORTSMOUTH WATER HOLDINGS LIMITED | 04373276 | 01/01/2019 | 30/06/2020 | Gold |
| WEST HAMPSHIRE WATER LIMITED | 05598453 | 01/04/2015 | 01/09/2018 | Dissolved |