| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DOGWOOD BUSINESS CONSULTING LIMITED | 12023198 | 29/05/2019 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATANA LTD | 04345865 | 18/03/2024 | 22/11/2024 | Bronze |
| CLEARWATER TECHNOLOGY LTD | 03659610 | 18/03/2024 | 22/11/2024 | Amber |
| GUARDIAN WATER TREATMENT LTD | 03913977 | 18/03/2024 | 22/11/2024 | Bronze |
| HYDRO-X AIR LIMITED | 10312166 | 18/03/2024 | 22/11/2024 | Gold |
| HYDRO-X TRAINING LIMITED | 11552549 | 18/03/2024 | 22/11/2024 | Gold |
| HYDRO-X WATER TREATMENT LIMITED | 01818133 | 18/03/2024 | 22/11/2024 | One Red Flag |
| KINGFISHER ENVIRONMENTAL SERVICES LIMITED | 03823185 | 18/03/2024 | 22/11/2024 | Silver |
| SEVERN TRENT DATA PORTAL LIMITED | 08181048 | 01/02/2017 | 18/10/2017 | Bronze |
| SEVERN TRENT PROPERTY SOLUTIONS LIMITED | 08181033 | 18/10/2017 | 19/10/2018 | Silver |
| SEVERN TRENT RETAIL AND UTILITY SERVICES LIMITED | 02562471 | 15/06/2018 | 28/03/2019 | Amber |
| SEVERN TRENT SERVICES (WATER AND SEWERAGE) LIMITED | 08880470 | 31/03/2018 | 19/10/2018 | Silver |
| SEVERN TRENT SERVICES OPERATIONS UK LIMITED | 04052522 | 01/02/2017 | 30/01/2019 | Gold |
| STERLING HYDROTECH LIMITED | 02275897 | 18/03/2024 | 22/11/2024 | Gold |
| TERSUS CONSULTANCY LIMITED | 01912115 | 18/03/2024 | 22/11/2024 | Silver |
| WCS ENVIRONMENTAL ENGINEERING LTD | 02583411 | 18/03/2024 | 22/11/2024 | Silver |
| WCS ENVIRONMENTAL LIMITED | 02184649 | 18/03/2024 | 22/11/2024 | Bronze |
| WCS ENVIRONMENTAL SOUTH EAST LTD | 03157322 | 18/03/2024 | 22/11/2024 | Silver |
| WCS SERVICES LIMITED | 05300448 | 18/03/2024 | 22/11/2024 | Two Red Flags |