| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AGBAR SERCO TECHNOLOGY SOLUTIONS LIMITED | 06736712 | 30/09/2013 | Dissolved |
| CAPITA IT SERVICES HOLDINGS LIMITED | 06002593 | 29/06/2022 | Silver |
| CAPITA SHARED SERVICES LIMITED | 13497834 | 29/06/2022 | Amber |
| COMPUTERLAND UK LIMITED | 02275625 | 16/06/2022 | Silver |
| DAISY UPDATA COMMUNICATIONS LIMITED | 08309479 | 03/11/2021 | Silver |
| GROSVENOR CAREER SERVICES LIMITED | 03119327 | 08/09/2023 | Not Trading |
| RETAIN INTERNATIONAL (HOLDINGS) LIMITED | 07871708 | 04/09/2023 | Not Trading |
| RETAIN INTERNATIONAL LIMITED | 03061744 | 04/09/2023 | Not Trading |
| SERCO CALEDONIAN FERRIES LIMITED | SC501980 | 30/03/2015 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAPITA PROPERTY AND INFRASTRUCTURE LIMITED | 02018542 | 01/06/2021 | 25/04/2023 | Silver |
| MERSEYRAIL ELECTRICS 2002 LIMITED | 04356933 | 19/02/2014 | 31/03/2017 | Silver |
| MERSEYRAIL SERVICES HOLDING COMPANY LIMITED | 04620520 | 27/03/2014 | 01/04/2017 | Silver |
| NORTHERN RAIL HOLDINGS LIMITED | 04007719 | 06/01/2015 | 31/03/2017 | Dissolved |
| NORTHERN RAIL LIMITED | 04619954 | 06/01/2015 | 31/03/2017 | Dissolved |
| RE (REGIONAL ENTERPRISE) LIMITED | 08615172 | 14/03/2018 | 30/06/2022 | Silver |
| SERCO CALEDONIAN SLEEPERS LIMITED | SC477821 | 03/06/2015 | 01/03/2017 | Gold |
| SERCO FERRIES (HR) LIMITED | 08118341 | 30/04/2015 | 31/03/2017 | Gold |