| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CHEM TRUST | 05933897 | 03/11/2016 | Gold |
| ENERGY SMART TRAINING LIMITED | 08331417 | 17/10/2016 | Dissolved |
| INSTITUTE OF MUNICIPAL TRANSPORT LIMITED(THE) | 01135486 | 17/10/2016 | Dissolved |
| INSTITUTE OF PACKAGING (THE) | 00786826 | 01/05/2019 | Not Trading |
| INTERNATIONAL CLAY TECHNOLOGY ASSOCIATION LIMITED | 14906541 | 31/05/2023 | Not Trading |
| IOM COMMUNICATIONS LIMITED | 03285009 | 05/02/2019 | Not Trading |
| MATERIALS INSTITUTE SERVICES LIMITED | 02882544 | 05/02/2019 | Bronze |
| MATERIALS PROCESSING INSTITUTE | 08919614 | 25/01/2019 | Amber |
| MATERIALS UK | 05809326 | 01/05/2019 | Not Trading |
| MATERIALS WORLD LTD | 06726108 | 01/05/2019 | Not Trading |
| RESOURCES AND WASTE UK LIMITED | 03489593 | 28/11/2017 | Dissolved |
| SIGNATURE MATERIALS LIMITED | 08238962 | 01/05/2019 | Not Trading |
| THE CERAMICS SOCIETY LIMITED | 13462600 | 17/06/2021 | Not Trading |
| THE MATERIALS CYCLE AWARDING BODY LIMITED | 11079947 | 01/05/2019 | Not Trading |
| THE SOCIETY FOR ADHESION AND ADHESIVES LIMITED | 13813131 | 22/12/2021 | Not Trading |
| WATER SMART (UK) LIMITED | 08325625 | 17/10/2016 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CIWM ENTERPRISES LTD | 02731563 | 17/10/2016 | 02/10/2018 | Gold |
| CIWM INTERNATIONAL LIMITED | 03510915 | 17/10/2016 | 02/10/2018 | Not Trading |
| INSTITUTE OF WASTES MANAGEMENT | 00229724 | 17/10/2016 | 02/10/2018 | Not Trading |
| LIGHTYEAR FOUNDATION LTD | 08151118 | 21/02/2018 | 09/03/2021 | Gold |
| RESOURCE SMART LIMITED | 08330891 | 17/10/2016 | 02/10/2018 | Not Trading |
| THE CARBON TRUST | 04190230 | 02/05/2009 | 07/02/2011 | Amber |
| THE WASTE AND RESOURCES ACTION PROGRAMME | 04125764 | 01/04/2012 | 22/08/2014 | Dissolved |
| WASTE SMART LIMITED | 08325813 | 17/10/2016 | 02/10/2018 | Not Trading |