| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ANGLIA RAILWAYS TRAIN SERVICES LIMITED | 03006570 | 12/11/2009 | Dissolved |
| EAST COAST TRAINS LIMITED | 08765536 | 14/09/2020 | Bronze |
| EAST WEST RAIL LIMITED | 04066321 | 12/11/2009 | Dissolved |
| FIRST CAPITAL CONNECT LIMITED | 05281077 | 04/01/2016 | Amber |
| FIRST CROSS COUNTRY LIMITED | 03467120 | 02/11/2009 | Dissolved |
| FIRST DOCKLANDS LIMITED | 03540904 | 04/05/2010 | Dissolved |
| FIRST DUBLIN METRO LIMITED | 03719564 | 12/11/2009 | Dissolved |
| FIRST EAST MIDLANDS LIMITED | 03459817 | 02/11/2009 | Dissolved |
| FIRST GREAT NORTHERN LIMITED | 04978535 | 02/11/2009 | Dissolved |
| FIRST GREAT WESTERN LINK LIMITED | 04804687 | 02/11/2009 | Dissolved |
| FIRST METRO LIMITED | 06764007 | 02/11/2009 | Dissolved |
| FIRST MTR SOUTH WESTERN TRAINS LIMITED | 07900320 | 10/07/2017 | Bronze |
| FIRST NORTHERN RAILWAY LIMITED | 04340736 | 04/05/2010 | Dissolved |
| FIRST RAIL PROCUREMENT LIMITED | 02996875 | 10/02/2012 | Gold |
| FIRST SCOTRAIL LIMITED | SC185018 | 04/01/2016 | Amber |
| FIRST TRAINS LIMITED | 03514178 | 02/11/2009 | Dissolved |
| FIRST TRANSPENNINE EXPRESS LIMITED | 09111801 | 12/06/2023 | Amber |
| FIRST/KEOLIS HOLDINGS LIMITED | 04113984 | 31/03/2011 | Gold |
| FIRST/KEOLIS TRANSPENNINE HOLDINGS LIMITED | 04113990 | 31/03/2011 | Gold |
| FIRST/KEOLIS TRANSPENNINE LIMITED | 04113923 | 03/10/2022 | Gold |
| GB EXTENDED VENTURES LIMITED | 03537904 | 12/11/2009 | Dissolved |
| GB RAILWAYS LIMITED | 03027949 | 12/11/2009 | Dissolved |
| GREAT EASTERN RAILWAY LIMITED | 03007936 | 19/06/2006 | Dissolved |
| GREAT WESTERN TRAINS COMPANY LIMITED | 02938992 | 02/11/2009 | Dissolved |
| GREAT WESTERN TRUSTEES LIMITED | 03161093 | 18/04/2012 | Dissolved |
| HULL TRAINS COMPANY LIMITED | 03715410 | 02/11/2009 | Bronze |
| NORTH WESTERN TRAINS COMPANY LIMITED | 03007946 | 02/11/2009 | Dissolved |
| TRAM OPERATIONS LIMITED | 03097532 | 01/11/2006 | Bronze |
| WILTSHIRE LEASING COMPANY LIMITED | 03401057 | 18/04/2012 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| EVOLUTIONARY RAIL LIMITED | 07153323 | 31/03/2011 | 06/08/2012 | One Red Flag |
| FIRST CUSTOMER CONTACT LIMITED | 07939526 | 14/09/2020 | 28/03/2023 | One Red Flag |
| FIRST RAIL (COMMUTER) LIMITED | 08485758 | 04/08/2023 | 10/04/2024 | Dissolved |
| FIRST RAIL SUPPORT LIMITED | 04340740 | 02/11/2009 | 13/05/2016 | Dissolved |
| GB RAILWAYS GROUP LIMITED | 03263210 | 12/11/2009 | 31/07/2024 | Silver |
| HULL TRAINS COMPANY LIMITED | 03715410 | 01/11/2006 | 06/12/2006 | Bronze |
| MISTRAL DATA LIMITED | 07153287 | 31/03/2011 | 28/04/2023 | Silver |