| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 'HIRE ONE' LIMITED | 04277104 | 09/08/2013 | Bronze |
| AMALGAMATED CONSTRUCTION (SCOTLAND) LIMITED | SC485741 | 02/09/2014 | Dissolved |
| AMALGAMATED CONSTRUCTION LTD | 00995892 | 23/02/2011 | Bronze |
| AMCO ENGINEERING LIMITED | 06702157 | 23/02/2011 | Dissolved |
| AMCO GIFFEN LIMITED | 06547087 | 30/08/2013 | Not Trading |
| AMCO GROUP HOLDINGS LIMITED | 06756943 | 23/02/2011 | Silver |
| AMCO GROUP LIMITED | 06476276 | 23/02/2011 | Gold |
| AMCO RAIL ENGINEERING LIMITED | 01214390 | 23/02/2011 | Dissolved |
| AMCO RAIL LIMITED | 02885603 | 23/02/2011 | Dissolved |
| BB & EA LIMITED | 02702539 | 07/06/2010 | Dissolved |
| CARNELL GROUP HOLDINGS LIMITED | 10192180 | 29/01/2020 | Silver |
| CARNELL SUPPORT SERVICES LIMITED | 02843581 | 29/01/2020 | Silver |
| CLARKE EV LTD | 12852626 | 02/09/2020 | Not Trading |
| CLARKE TELECOM LIMITED | 07524755 | 28/04/2014 | Bronze |
| CLOANEX LIMITED | 15368101 | 10/06/2024 | Not Trading |
| EMERGYA WIND TECHNOLOGIES UK HOLDING LIMITED | SC389938 | 04/10/2024 | Amber |
| ENISCA BROWNE LIMITED | NI630526 | 14/12/2022 | Bronze |
| ENISCA GROUP LIMITED | NI648204 | 28/11/2022 | One Red Flag |
| ENISCA LIMITED | NI035820 | 28/11/2022 | Bronze |
| ENISCA SITE SERVICES LIMITED | NI648502 | 28/11/2022 | Silver |
| EXCALON HOLDINGS LIMITED | 15509906 | 10/06/2024 | Amber |
| EXCALON LIMITED | 04450846 | 10/06/2024 | Silver |
| FULL CIRCLE WIND SERVICES LTD. | SC576543 | 04/10/2024 | Gold |
| FULL CIRCLE WIND SERVICES UK LTD | SC390117 | 04/10/2024 | Bronze |
| GIFFEN GROUP LIMITED | 00252314 | 31/10/2016 | Bronze |
| GIFFEN HOLDINGS LIMITED | 06994252 | 31/10/2016 | Amber |
| J BROWNE CAPITAL DELIVERY LIMITED | 10603963 | 25/03/2021 | Dissolved |
| J BROWNE DEVELOPER SERVICES LIMITED | 09077652 | 25/03/2021 | Silver |
| J BROWNE PLANT LIMITED | 12867945 | 25/03/2021 | Gold |
| J. BROWNE GROUP HOLDINGS LIMITED | 06599855 | 25/03/2021 | Amber |
| J.BROWNE CONSTRUCTION COMPANY LIMITED | 01000440 | 25/03/2021 | Silver |
| K M D HOLDINGS LIMITED | 10983872 | 28/11/2022 | Silver |
| KEMADA LIMITED | 06654928 | 28/11/2022 | One Red Flag |
| KEMADA PROJECT & CONTRACT SERVICES LTD | 08300548 | 28/11/2022 | Silver |
| KNEX PIPELINES & CABLES LIMITED | 03417019 | 09/08/2013 | Dissolved |
| MOTROL LIMITED | NI648259 | 28/11/2022 | Silver |
| NUCLEAR DECONTAMINATION SERVICES LTD | 06483958 | 29/01/2016 | Not Trading |
| PINE PLANT LIMITED | 12405040 | 15/01/2020 | Bronze |
| PROFITEC SOLUTIONS LTD | NI073890 | 28/11/2022 | Silver |
| QTS GROUP LTD. | SC346116 | 10/05/2018 | Silver |
| QTS RAIL LTD | SC346110 | 10/05/2018 | Not Trading |
| QTS SPECIALISED PLANT SERVICES LTD | SC460391 | 10/05/2018 | Not Trading |
| QTS TRAINING LTD | SC346108 | 10/05/2018 | Silver |
| RAIL ELECTRIFICATION LIMITED | SC512016 | 28/05/2021 | Bronze |
| RENEW FLEET MANAGEMENT LIMITED | 09195355 | 08/09/2014 | Bronze |
| RENEW PROPERTY DEVELOPMENTS LIMITED | 07203268 | 20/04/2011 | Not Trading |
| ROUTE ONE HIGHWAYS LIMITED | 11006406 | 08/04/2024 | Not Trading |
| ROUTE ONE HOLDINGS (WAKEFIELD) LIMITED | 07575515 | 08/04/2024 | One Red Flag |
| ROUTE ONE INFRASTRUCTURE LIMITED | 05636026 | 08/04/2024 | Silver |
| ROUTE ONE RAIL LIMITED | 09844629 | 08/04/2024 | Not Trading |
| T.I.S.CUMBRIA LIMITED | 03786942 | 26/10/2023 | One Red Flag |
| TIDENTIME LIMITED | 08430277 | 05/04/2013 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BPE SPECIALISED DRILLINGS LIMITED | 04080803 | 01/08/2014 | 02/02/2018 | Not Trading |
| FOREFRONT GROUP LIMITED | 05315339 | 01/08/2014 | 02/02/2018 | Not Trading |
| FOREFRONT UTILITIES LIMITED | 03214416 | 01/08/2014 | 02/02/2018 | Bronze |