| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BOMBARDIER AEROSPACE (HOLDINGS) UK LIMITED | 10489963 | 18/11/2022 | Gold |
| BOMBARDIER AEROSPACE U.K. LIMITED | 02873601 | 18/11/2022 | Gold |
| BOMBARDIER UK HOLDING LIMITED | 09740653 | 21/01/2021 | Amber |
| CULLERCOATS CORPORATE LTD | 12150386 | 12/08/2019 | Silver |
| RATP DEV UK LTD | 07281350 | 19/05/2020 | One Red Flag |
| SPECIALIST UMBILICAL SERVICES LTD | 05400873 | 01/03/2006 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALSTOM (INVESTMENT) UK LIMITED | 09863932 | 13/09/2018 | 29/01/2021 | Silver |
| ALSTOM (LITCHURCH) LIMITED | 01712661 | 08/08/2011 | 06/06/2016 | Silver |
| ALSTOM ELECTRONICS LIMITED | 02988520 | 08/08/2011 | 06/06/2016 | Amber |
| ALSTOM ENGINEERING AND SERVICES LIMITED | 02235994 | 08/08/2011 | 24/05/2016 | Amber |
| ALSTOM TRANSPORTATION (GLOBAL HOLDING) UK LIMITED | 09862744 | 25/05/2017 | 29/01/2021 | Gold |
| BOMBARDIER TRANSPORTATION (GAUTRAIN) UK LIMITED | 03138093 | 08/08/2011 | 06/06/2016 | Dissolved |
| BOMBARDIER TRANSPORTATION (PROJECTS) UK LIMITED | 04433533 | 08/08/2011 | 06/06/2016 | Dissolved |
| BOMBARDIER TRANSPORTATION (SIGNAL) UK LTD | 03062720 | 08/08/2011 | 06/06/2016 | Dissolved |
| CLASS 345 TRAINS LIMITED | 00653221 | 08/08/2011 | 06/06/2016 | Dissolved |
| CROSSFLEET LIMITED | 03614181 | 08/08/2011 | 06/06/2016 | Bronze |
| INFRASIG LIMITED | 08018007 | 03/04/2012 | 12/07/2012 | Gold |
| LONDON SOVEREIGN LIMITED | 02467207 | 18/03/2020 | 18/05/2021 | Amber |
| LONDON UNITED BUSWAYS LIMITED | 02328561 | 18/03/2020 | 18/05/2021 | Amber |
| PRORAIL LIMITED | 01314819 | 08/08/2011 | 06/06/2016 | Amber |
| QUALITY LINE TRANSPORT LIMITED | 00281992 | 18/03/2020 | 18/05/2021 | Gold |
| RATP DEV TRANSIT LONDON LTD | 13610251 | 11/12/2021 | 19/06/2024 | Amber |
| SETML TRANSPORTATION LIMITED | 03138390 | 08/08/2011 | 06/06/2016 | Dissolved |
| SOUTH EASTERN TRAIN MAINTENANCE LIMITED | 03341029 | 08/08/2011 | 06/06/2016 | Not Trading |