| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DYNAMIC ASSEMBLY LIMITED | 04335640 | 06/12/2001 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ABINGTON PARK LIMITED | 03587952 | 14/09/2010 | 01/01/2020 | Not Trading |
| BARRIKADE LIMITED | 04026476 | 14/09/2010 | 01/01/2020 | Dissolved |
| FULLAGAR TECHNOLOGIES LIMITED | 10574265 | 20/01/2017 | 11/06/2019 | Gold |
| GPE 1 LIMITED | 09893328 | 30/11/2015 | 01/01/2020 | One Red Flag |
| GPE 2 LIMITED | 11896091 | 21/03/2019 | 01/01/2020 | Bronze |
| GRANTA CENTRE LIMITED | 04026422 | 25/08/2016 | 01/01/2020 | Dissolved |
| GRANTA ENTRANCE LIMITED | 07299156 | 20/09/2010 | 01/01/2020 | Bronze |
| GRANTA PARK ESTATES LIMITED | 02558329 | 01/07/2010 | 01/01/2020 | Silver |
| GRANTA PARK LIMITED | 09373579 | 05/01/2015 | 01/01/2020 | Dissolved |
| NATIONAL COMPOSITES NETWORK LIMITED | 05238421 | 25/11/2015 | 01/01/2020 | Dissolved |
| NSIRC LIMITED | 08311437 | 28/11/2012 | 01/01/2020 | Not Trading |
| PLANT INTEGRITY LIMITED | 03341703 | 14/09/2010 | 01/01/2020 | Bronze |
| SIRF LIMITED | 08311440 | 07/02/2013 | 01/01/2020 | Not Trading |
| SURFLOW LIMITED | 11512928 | 13/08/2018 | 01/01/2020 | Dissolved |
| THE TEST HOUSE (CAMBRIDGE) LIMITED | 02513984 | 17/04/2013 | 01/01/2020 | One Red Flag |
| TWI (SCOTS) LTD | SC404965 | 20/08/2012 | 01/01/2020 | Dissolved |
| TWI CERTIFICATION LIMITED | 03108202 | 17/04/2013 | 01/01/2020 | Silver |
| TWI ESTATES LIMITED | 03203074 | 14/09/2010 | 01/01/2020 | Silver |
| TWI LIMITED | 03859442 | 17/05/2016 | 01/01/2020 | Gold |
| TWI RESEARCH CENTRE (CYMRU) LIMITED | 04896607 | 25/08/2016 | 01/01/2020 | Dissolved |
| TWI TECHNOLOGY CENTRE (YORKSHIRE) LIMITED | 04456545 | 25/08/2016 | 01/01/2020 | Not Trading |
| TWI TECHNOLOGY TRUST | 04323948 | 14/09/2010 | 01/01/2020 | Dissolved |
| VITRESYN LIMITED | 04026459 | 14/09/2010 | 01/01/2020 | Dissolved |
| WAVERLEY TECHNOLOGY LIMITED | 05248952 | 25/08/2016 | 01/01/2020 | Not Trading |