| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Club Athletica (Worcester) Ltd | 02152388 | 13/02/1997 | Dissolved |
| Club Athletica Ltd | 02834869 | 28/08/1997 | Dissolved |
| Serco International Services Ltd | 02568815 | 06/01/1997 | Dissolved |
| Serco Pharaoh Holdings Unltd | 05366615 | 16/02/2005 | Dissolved |
| Serco Pharaoh Unltd | 05375904 | 25/02/2005 | Dissolved |
| Serco Project Development Ltd | 02834872 | 19/09/1996 | Dissolved |
| Serco Washington Unltd | 05368031 | 17/02/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| KILMARNOCK PRISON SERVICES LIMITED | 03226951 | 05/11/1997 | 01/09/2003 | Amber |
| Kilmarnock Prison (Holdings) Ltd | 03443465 | 05/11/1997 | 01/09/2003 | Dissolved |
| LOWDHAM GRANGE PRISON SERVICES LIMITED | 03154430 | 28/10/1996 | 01/09/2003 | Amber |
| MEDOMSLEY TRAINING SERVICES LIMITED | 03488633 | 03/11/1998 | 01/09/2003 | Dissolved |
| MORETON PRISON SERVICES LIMITED | 03471077 | 06/09/1999 | 01/09/2003 | Bronze |
| Medomsley Holdings Ltd | 03488629 | 03/11/1998 | 01/09/2003 | Dissolved |
| Moreton Prison (Holdings) Ltd | 03471078 | 06/09/1999 | 01/09/2003 | Dissolved |
| NORTHERN RAIL HOLDINGS LIMITED | 04007719 | 04/12/2001 | 09/07/2002 | Dissolved |
| PUCKLECHURCH CUSTODIAL SERVICES LIMITED | 03403669 | 04/06/1998 | 01/09/2003 | Amber |
| SERCO HOLDINGS LIMITED | 03970268 | 21/06/2000 | 03/12/2001 | Silver |
| SERCO PAISA LIMITED | 04908482 | 20/10/2003 | 03/02/2006 | Bronze |
| Serco Insurance Services Ltd | 03471126 | 04/06/1998 | 01/09/2003 | Dissolved |