| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Eastern Railways Ltd | 04357816 | 06/02/2002 | Dissolved |
| Great Anglia Railways Ltd | 04357909 | 06/02/2002 | Dissolved |
| Great Anglian Railways Ltd | 04357998 | 06/02/2002 | Dissolved |
| Greater Anglia Railways Ltd | 04358074 | 06/02/2002 | Dissolved |
| Mtr Corporation (Ikf) Ltd | 05205403 | 24/10/2005 | Dissolved |
| Mtr Corporation (No.2) Ltd | 05205400 | 25/05/2005 | Dissolved |
| Mtr Corporation (Swt) Ltd | 05617029 | 22/11/2005 | Dissolved |
| Mtr Laing Railway Co Ltd | 05336720 | 25/05/2005 | Dissolved |
| Rail Wales Ltd | 04103684 | 21/11/2000 | Dissolved |
| South Western Railway Ltd | 03949588 | 10/11/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ANGLIA RAILWAYS TRAIN SERVICES LIMITED | 03006570 | 05/01/1997 | 07/04/2005 | Dissolved |
| APPIA EUROPE LIMITED | 06490323 | 28/03/2008 | 20/08/2009 | Silver |
| APPIA FINANCE 2 LIMITED | 06538054 | 28/03/2008 | 20/08/2009 | Dissolved |
| APPIA FINANCE LIMITED | 06490331 | 28/03/2008 | 20/08/2009 | Dissolved |
| APPIA INVESTMENTS LIMITED | 06490313 | 28/03/2008 | 20/08/2009 | Dissolved |
| CDG 4 LIMITED | 02619069 | 18/07/1991 | 01/07/1994 | Dissolved |
| EAST WEST RAIL LIMITED | 04066321 | 04/12/2000 | 07/04/2005 | Dissolved |
| FIRST DUBLIN METRO LIMITED | 03719564 | 31/03/1999 | 07/04/2005 | Dissolved |
| FIRST GREAT WESTERN LINK LIMITED | 04804687 | 17/03/2004 | 07/04/2005 | Dissolved |
| FIRST RAIL HOLDINGS LIMITED | 05154485 | 19/08/2004 | 07/04/2005 | Silver |
| FIRST SCOTRAIL LIMITED | SC185018 | 05/07/2004 | 07/04/2005 | Amber |
| FIRST/KEOLIS HOLDINGS LIMITED | 04113984 | 12/03/2004 | 07/04/2005 | Gold |
| FIRST/KEOLIS TRANSPENNINE HOLDINGS LIMITED | 04113990 | 12/03/2004 | 07/04/2005 | Gold |
| FIRST/KEOLIS TRANSPENNINE LIMITED | 04113923 | 12/03/2004 | 07/04/2005 | Gold |
| GB EXTENDED VENTURES LIMITED | 03537904 | 31/03/1998 | 07/04/2005 | Dissolved |
| GB RAILFREIGHT LIMITED | 03707899 | 31/03/1999 | 07/04/2005 | Bronze |
| GB RAILWAYS GROUP LIMITED | 03263210 | 02/12/1996 | 07/04/2005 | Gold |
| GB RAILWAYS LIMITED | 03027949 | 18/07/1995 | 07/04/2005 | Dissolved |
| GREAT EASTERN RAILWAY LIMITED | 03007936 | 17/03/2004 | 07/04/2005 | Dissolved |
| GREAT WESTERN TRAINS COMPANY LIMITED | 02938992 | 17/03/2004 | 07/04/2005 | Dissolved |
| HULL TRAINS COMPANY LIMITED | 03715410 | 31/03/1999 | 07/04/2005 | Gold |
| LONDON OVERGROUND RAIL OPERATIONS LTD | 05668786 | 06/01/2006 | 30/09/2020 | Dissolved |
| MTR CORPORATION (SILVERLINK) LIMITED | 05655294 | 03/01/2006 | 30/09/2020 | Not Trading |
| MTR CORPORATION (UK) LIMITED | 05205402 | 24/10/2005 | 30/09/2020 | Silver |
| MTR CORPORATION (UK) NRT LIMITED | 08754902 | 30/10/2013 | 27/07/2016 | Amber |
| MTR WEST COAST PARTNERSHIP LIMITED | 11461172 | 12/07/2018 | 30/09/2020 | Dissolved |
| NORTH WESTERN TRAINS COMPANY LIMITED | 03007946 | 17/03/2004 | 07/04/2005 | Dissolved |
| RAIL DELIVERY GROUP LIMITED | 08176197 | 05/03/2018 | 01/10/2020 | Bronze |
| TELEPERFORMANCE GLOBAL BPO UK LIMITED | 02180352 | 17/03/2004 | 07/04/2005 | Amber |