| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cambridgeshire Custodial Services Ltd | 03931288 | 01/09/2004 | Dissolved |
| Kilmarnock Prison (Holdings) Ltd | 03443465 | 21/07/2006 | Dissolved |
| Laser (Teddington Holding) Ltd | 03479575 | 05/06/2003 | Dissolved |
| Laser (Teddington Ii) Ltd | 03480654 | 05/06/2003 | Dissolved |
| Medomsley Holdings Ltd | 03488629 | 21/07/2006 | Dissolved |
| Moreton Prison (Holdings) Ltd | 03471078 | 21/07/2006 | Dissolved |
| Prime Contractors Ltd | 02378246 | 21/07/2006 | Dissolved |
| SKYWILLOW LIMITED | 01218805 | 01/09/1993 | Dissolved |
| Serco Contracting Ltd | 02435848 | 21/07/2006 | Dissolved |
| Serco Leisure Ltd | 02202587 | 21/07/2006 | Dissolved |
| Serco Project Development Ltd | 02834872 | 21/07/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Altram (Manchester) Ltd | 03261281 | 02/09/2002 | 27/07/2005 | Dissolved |
| DEFENCE MANAGEMENT (HOLDINGS) LIMITED | 03564570 | 19/09/2002 | 09/12/2003 | Gold |
| DEFENCE MANAGEMENT (WATCHFIELD) LIMITED | 03385241 | 19/09/2002 | 09/12/2003 | Gold |
| Kilmarnock Prison (Holdings) Ltd | 03443465 | 01/09/2004 | 15/02/2006 | Dissolved |
| LOWDHAM GRANGE PRISON SERVICES LIMITED | 03154430 | 01/09/2004 | 02/12/2006 | Amber |
| MORETON PRISON SERVICES LIMITED | 03471077 | 01/09/2004 | 02/12/2006 | Bronze |
| Medomsley Holdings Ltd | 03488629 | 01/09/2004 | 15/02/2006 | Dissolved |
| Moreton Prison (Holdings) Ltd | 03471078 | 01/09/2004 | 15/02/2006 | Dissolved |
| PREMIER CUSTODIAL FINANCE LIMITED | 03849244 | 01/09/2004 | 02/12/2006 | Amber |
| PREMIER CUSTODIAL INVESTMENTS LIMITED | 03849142 | 01/09/2004 | 02/12/2006 | Bronze |
| PUCKLECHURCH CUSTODIAL SERVICES LIMITED | 03403669 | 01/09/2004 | 02/12/2006 | Amber |
| SERCO GEOGRAFIX LIMITED | 03522659 | 01/09/2004 | 28/09/2006 | Dissolved |
| SERCO INVESTMENTS (HOLDINGS) LIMITED | 04080682 | 18/11/2002 | 10/06/2005 | Dissolved |
| SERCO INVESTMENTS LIMITED | 03287461 | 18/11/2002 | 10/06/2005 | Dissolved |
| SERCO INVESTMENTS LIMITED | 03287461 | 18/11/2002 | 10/06/2005 | Dissolved |
| Serco Insurance Services Ltd | 03471126 | 01/09/2004 | 21/06/2005 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) HOLDINGS LIMITED | 04017593 | 18/11/2002 | 10/06/2005 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) HOLDINGS LIMITED | 04017593 | 09/10/2002 | 04/08/2004 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) LIMITED | 04017551 | 18/11/2002 | 10/06/2005 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) LIMITED | 04017551 | 09/10/2002 | 04/08/2004 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) SECURITY LIMITED | 04071538 | 18/11/2002 | 10/06/2005 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) SECURITY LIMITED | 04071538 | 09/10/2002 | 04/08/2004 | Dissolved |