| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 2SERVE (St Peter's) Ltd | 02911027 | 30/03/1994 | Dissolved |
| Serco Facilities Management Ltd | 02517692 | 18/08/1994 | Dissolved |
| Serco Government Central Services Ltd | 02756646 | 10/10/1994 | Dissolved |
| Serco Health Services Ltd | 02478475 | 10/10/1994 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| 2SERVE (St Peter's) Ltd | 02911027 | 01/12/1994 | 06/11/1995 | Dissolved |
| Building Management Scotland Ltd | SC148972 | 01/03/1996 | 01/04/1999 | Dissolved |
| Community Leisure Management Ltd | 02163239 | 08/09/1994 | 01/01/1996 | Dissolved |
| Community Leisure Management Ltd | 02163239 | 08/09/1994 | 01/04/1999 | Dissolved |
| Euroserv Ltd | 01562858 | 06/11/1995 | 01/04/1999 | Dissolved |
| I A L Ltd | 01630799 | 06/11/1995 | 01/04/1999 | Dissolved |
| International Aeradio Consultancy Services Ltd | 00952762 | 06/11/1995 | 01/04/1999 | Dissolved |
| International Aeradio Ltd | 01485659 | 06/11/1995 | 01/04/1999 | Dissolved |
| London Call Centre Co Ltd | 03334238 | 01/04/1997 | 01/04/1999 | Dissolved |
| NPL MANAGEMENT LIMITED | 02937881 | 18/01/1995 | 01/09/1995 | Gold |
| PREMIER PRISON SERVICES LIMITED | 02733334 | 04/05/1994 | 01/04/1999 | Dissolved |
| Premier Training Services Ltd | 03488626 | 03/11/1998 | 15/07/1999 | Dissolved |
| Prime Contractors Ltd | 02378246 | 10/10/1994 | 01/01/1996 | Dissolved |
| Prime Contractors Ltd | 02378246 | 10/10/1994 | 01/04/1999 | Dissolved |
| Railtest Ltd | 03302974 | 14/02/1997 | 09/03/1999 | Dissolved |
| Railtest Operations Ltd | 03318555 | 14/02/1997 | 09/03/1999 | Dissolved |
| SERCO EUROPE LIMITED | 00451392 | 06/11/1995 | 01/04/1999 | Dissolved |
| SERCO GROUP PLC | 02048608 | 29/02/1996 | 01/04/1999 | Silver |
| SERCO GULF ENGINEERING LIMITED | 02809869 | 06/04/1994 | 25/07/1995 | Dissolved |
| SERCO INTERNATIONAL LIMITED | 02324094 | 06/11/1995 | 01/04/1999 | Silver |
| SERCO LIMITED | 00242246 | 05/03/1994 | 01/11/1995 | Silver |
| SERCO LIMITED | 00242246 | 06/11/1995 | 01/04/1999 | Silver |
| SERCO-IAL LIMITED | 00427272 | 06/11/1995 | 01/04/1999 | Silver |
| Salco Ltd | SC119531 | 04/08/1994 | 31/03/1998 | Dissolved |
| Serco Aviation Services Ltd | 01538157 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Contracting Ltd | 02435848 | 10/10/1994 | 01/01/1996 | Dissolved |
| Serco Contracting Ltd | 02435848 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Defence F M Ltd | SC148509 | 01/03/1996 | 12/06/1998 | Dissolved |
| Serco Development Services Ltd | 00592499 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Education Ltd | 02109225 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Facilities Management Ltd | 02517692 | 18/08/1994 | 06/11/1995 | Dissolved |
| Serco Field Services Ltd | 02050174 | 04/03/1997 | 01/04/1999 | Dissolved |
| Serco Government Central Services Ltd | 02756646 | 10/10/1994 | 06/11/1995 | Dissolved |
| Serco Health Services Ltd | 02478475 | 10/10/1994 | 06/11/1995 | Dissolved |
| Serco Inactive 1 Ltd | 02269522 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Inactive 2 Ltd | SC148913 | 01/03/1996 | 01/04/1999 | Dissolved |
| Serco Inactive 4 Ltd | 00850447 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco International Fire Training Centre Ltd | 01563367 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Leisure Ltd | 02202587 | 10/10/1994 | 01/01/1996 | Dissolved |
| Serco Leisure Ltd | 02202587 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Maintenance Services Ltd | 02674902 | 10/10/1994 | 01/02/1995 | Dissolved |
| Serco Maintenance Services Ltd | 02674902 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Management Services Ltd | SC148516 | 01/03/1996 | 01/04/1999 | Dissolved |
| Serco Metrolink Ltd | 03337055 | 27/03/1997 | 09/03/1999 | Dissolved |
| Serco Nationwide Fire Services Ltd | 03306417 | 24/01/1997 | 09/03/1999 | Dissolved |
| Serco Operations Ltd | 01858592 | 10/10/1994 | 06/11/1995 | Dissolved |
| Serco Operations Ltd | 01858592 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Quality & Safety Services Ltd | 02475633 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Rail Services Ltd | 03119213 | 14/10/1997 | 09/03/1999 | Dissolved |
| Serco Raildata Ltd | 03340203 | 27/03/1997 | 09/03/1999 | Dissolved |
| Serco Railtest Ltd | 03114741 | 14/02/1997 | 09/03/1999 | Dissolved |
| Serco Resource Management Ltd | 02213159 | 10/10/1994 | 06/11/1995 | Dissolved |
| Serco Resource Management Ltd | 02213159 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Services Ltd | SC145051 | 06/11/1995 | 01/04/1999 | Dissolved |
| Serco Skysafe Limited | 02496715 | 10/10/1994 | 06/11/1995 | Dissolved |
| Serco Skysafe Limited | 02496715 | 10/10/1994 | 01/04/1999 | Dissolved |
| Serco Southall Services Ltd | 02054685 | 20/11/1995 | 01/04/1999 | Dissolved |
| Sercoserve Ltd | 02497013 | 16/09/1994 | 01/01/1996 | Dissolved |
| Sercoserve Ltd | 02497013 | 16/09/1994 | 01/04/1999 | Dissolved |
| Superbusy Ltd | 02533020 | 04/08/1994 | 06/11/1995 | Dissolved |
| Superbusy Ltd | 02533020 | 04/08/1994 | 01/04/1999 | Dissolved |