| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Triserv (Material Hiandling) Ltd | 03717801 | 23/02/1999 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Altram (Manchester) Ltd | 03261281 | 23/04/1997 | 06/06/1997 | Dissolved |
| DEFENCE MANAGEMENT (HOLDINGS) LIMITED | 03564570 | 14/05/1998 | 30/06/2002 | Gold |
| DEFENCE MANAGEMENT (WATCHFIELD) LIMITED | 03385241 | 11/06/1997 | 30/06/2002 | Gold |
| KILMARNOCK PRISON SERVICES LIMITED | 03226951 | 05/11/1997 | 19/07/1999 | Amber |
| Kilmarnock Prison (Holdings) Ltd | 03443465 | 05/11/1997 | 19/07/1999 | Dissolved |
| LOWDHAM GRANGE PRISON SERVICES LIMITED | 03154430 | 14/01/1997 | 19/07/1999 | Amber |
| Laser (Teddington Holding) Ltd | 03479575 | 11/12/1997 | 26/06/2002 | Dissolved |
| Laser (Teddington Ii) Ltd | 03480654 | 15/12/1997 | 26/06/2002 | Dissolved |
| MEDOMSLEY TRAINING SERVICES LIMITED | 03488633 | 03/11/1998 | 19/07/1999 | Dissolved |
| Medomsley Holdings Ltd | 03488629 | 03/11/1998 | 19/07/1999 | Dissolved |
| OCTAGON HEALTHCARE HOLDINGS (NORWICH) LIMITED | 03367686 | 11/07/1997 | 09/01/1998 | Bronze |
| OCTAGON HEALTHCARE LIMITED | 03112891 | 01/08/1997 | 09/01/1998 | Silver |
| PUCKLECHURCH CUSTODIAL SERVICES LIMITED | 03403669 | 04/06/1998 | 19/07/1999 | Amber |
| SERCO INVESTMENTS LIMITED | 03287461 | 22/01/1998 | 28/06/2002 | Dissolved |
| SERCO-IAL LIMITED | 00427272 | 01/06/1992 | 31/12/1992 | Silver |
| Serco Insurance Services Ltd | 03471126 | 04/06/1998 | 19/07/1999 | Dissolved |
| Serco Systems Ltd | 01861237 | 03/02/1997 | 16/01/2001 | Dissolved |