| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| SCOTTISH AND SOUTHERN ENERGY POWER DISTRIBUTION LIMITED | SC213459 | 04/01/2021 | Gold |
| SCOTTISH HYDRO ELECTRIC POWER DISTRIBUTION PLC | SC213460 | 04/01/2021 | Silver |
| SOUTHERN ELECTRIC POWER DISTRIBUTION PLC | 04094290 | 04/01/2021 | Silver |
| SSEN DISTRIBUTION LIMITED | SC742389 | 24/08/2022 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ARRIVA RAIL LO LIMITED | 04165863 | 22/08/2016 | 09/10/2020 | Not Trading |
| ARRIVA RAIL LONDON LIMITED | 04165861 | 23/03/2016 | 09/10/2020 | Silver |
| ARRIVA RAIL NORTH LIMITED | 04337712 | 03/12/2015 | 09/10/2020 | Amber |
| ARRIVA TRAINS WALES/TRENAU ARRIVA CYMRU LIMITED | 04337645 | 10/08/2016 | 09/10/2020 | Gold |
| ARRIVA UK TRAINS LIMITED | 03166214 | 17/11/2014 | 09/10/2020 | Silver |
| AT SEAT CATERING (2003) LIMITED | 04337740 | 10/08/2016 | 09/10/2020 | Dissolved |
| GRAND CENTRAL RAILWAY COMPANY LIMITED | 03979826 | 10/08/2016 | 09/10/2020 | Silver |
| LONDON AND NORTH WESTERN RAILWAY COMPANY LIMITED | 02880012 | 10/08/2016 | 09/10/2020 | Gold |
| LONDON OVERGROUND RAIL OPERATIONS LTD | 05668786 | 11/11/2014 | 18/07/2019 | Dissolved |
| NEW SOUTHERN RAILWAY LIMITED | 03010919 | 01/04/2006 | 15/08/2014 | Gold |
| RAIL DELIVERY GROUP LIMITED | 08176197 | 04/02/2016 | 09/09/2020 | Bronze |
| REGIO TYNE AND WEAR LIMITED | 06733214 | 10/08/2016 | 09/10/2020 | Strike Off |
| SCOTTISH HYDRO ELECTRIC TRANSMISSION PLC | SC213461 | 04/01/2021 | 30/11/2022 | Silver |
| SOUTHERN RAILWAY LIMITED | 06574965 | 10/06/2008 | 15/08/2014 | Gold |
| THE CHILTERN RAILWAY COMPANY LIMITED | 03007939 | 10/08/2016 | 09/10/2020 | Silver |
| XC TRAINS LIMITED | 04402048 | 10/08/2016 | 09/10/2020 | One Red Flag |