| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| PURITE INTERNATIONAL LIMITED | 01887438 | 28/10/2014 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BUSINESS COUNCIL FOR SUSTAINABLE DEVELOPMENT-UNITED KINGDOM | 03728262 | 19/11/2009 | 16/07/2014 | Silver |
| NORMEC DETS LIMITED | 03705645 | 28/02/2017 | 01/01/2018 | One Red Flag |
| NORMEC LATIS SCIENTIFIC LIMITED | 01737587 | 28/02/2017 | 01/01/2018 | Bronze |
| NSI INDUSTRIAL O&M SOLUTIONS LTD | 02528695 | 14/11/2007 | 01/01/2018 | One Red Flag |
| OAKLAND CALVERT CONSULTANTS LIMITED | 02354342 | 28/02/2017 | 01/01/2018 | Dissolved |
| ONDEO INDUSTRIAL SOLUTIONS UK LIMITED | 04319605 | 28/10/2014 | 01/01/2018 | Silver |
| PURITE HOLDINGS LIMITED | 03182773 | 28/10/2014 | 01/01/2018 | Silver |
| SHELCORP 2008 LTD | 06620874 | 28/02/2017 | 01/01/2018 | Dissolved |
| SUEZ ADVANCED SOLUTIONS HOLDING UK LIMITED | 07200499 | 03/04/2017 | 01/01/2018 | Bronze |
| SUEZ ADVANCED SOLUTIONS UK LIMITED | 05687775 | 28/02/2017 | 01/01/2018 | Amber |
| TRIOGEN HOLDINGS LIMITED | SC123757 | 29/02/2016 | 01/01/2018 | Gold |
| TRIOGEN LIMITED | SC120472 | 29/02/2016 | 01/01/2018 | Silver |
| VEOLIA WATER PURIFICATION SYSTEMS LTD. | 01464412 | 25/05/2011 | 01/01/2018 | One Red Flag |
| WCS SERVICES LIMITED | 05300448 | 28/04/2016 | 24/08/2018 | One Red Flag |