| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Arup-Atkins International Ltd | 01815951 | 01/04/1993 | Dissolved |
| Great Games Grouping (G3) Ltd | 05780807 | 26/06/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATKINS INVESTMENTS LIMITED | 03716738 | 12/03/1999 | 22/06/2000 | Dissolved |
| ATKINS PLANNING & MANAGEMENT CONSULTANTS LIMITED | 00819139 | 20/09/1992 | 22/06/2000 | Dissolved |
| ATKINSRÉALIS (WS) LIMITED | 01885586 | 15/11/1994 | 22/06/2000 | Gold |
| ATKINSRÉALIS CONSULTANTS LIMITED | 00755613 | 01/06/1992 | 22/06/2000 | Dissolved |
| ATKINSRÉALIS RAIL LIMITED | 01026689 | 23/10/1996 | 22/06/2000 | Silver |
| ATKINSRÉALIS UK HOLDINGS LIMITED | 03754382 | 15/04/1999 | 22/06/2000 | Gold |
| ATKINSRÉALIS UK INTERNATIONAL LIMITED | 01091953 | 20/09/1992 | 22/06/2000 | Silver |
| ATMOS LIMITED | 00916423 | 08/07/1996 | 22/06/2000 | Dissolved |
| BALFOUR BEATTY MANAGEMENT LIMITED | 04590162 | 23/07/2003 | 31/10/2014 | Not Trading |
| BIGNELL & ASSOCIATES LIMITED | 04338866 | 12/04/2007 | 02/01/2014 | Not Trading |
| CARNELIAN LIMITED | 03288677 | 14/02/1997 | 22/06/2000 | Dissolved |
| CONNECT A30/A35 LIMITED | 03104987 | 17/10/1995 | 15/06/2000 | Silver |
| CONNECT PLUS (M25) HOLDINGS LIMITED | 06684025 | 18/05/2009 | 22/04/2010 | Bronze |
| CONNECT PLUS (M25) INTERMEDIATE LIMITED | 06714713 | 18/05/2009 | 22/04/2010 | Amber |
| CONNECT PLUS (M25) LIMITED | 06683845 | 18/05/2009 | 22/04/2010 | Bronze |
| CONNECT ROADS LIMITED | 02988999 | 17/10/1995 | 15/06/2000 | One Red Flag |
| CUBIC SURFACE TRANSPORTATION SYSTEMS LIMITED | 03162437 | 04/08/1999 | 14/02/2001 | Silver |
| Connect A55 Ltd | 03525190 | 21/05/1998 | 15/06/2000 | Dissolved |
| HEERY HOLDINGS LIMITED | 01583480 | 13/10/2006 | 18/06/2010 | Dissolved |
| HEERY INTERNATIONAL LIMITED | 02759565 | 12/03/2007 | 18/06/2010 | Dissolved |
| NETWORK TRAIN ENGINEERING SERVICES LIMITED | 03062723 | 01/04/1996 | 22/06/2000 | Dissolved |
| OPAL ENGINEERING LIMITED | 03204631 | 14/02/1997 | 22/06/2000 | Dissolved |
| WOOTTON JEFFREYS CONSULTANTS LIMITED | 02422683 | 29/07/1994 | 22/06/2000 | Dissolved |
| WS ATKINS CEDAC LIMITED | 03035951 | 15/12/1995 | 22/06/2000 | Dissolved |
| WS ATKINS POWERTRACK LIMITED | 03033350 | 15/12/1995 | 22/06/2000 | Dissolved |
| Ws Atkins Rail Ltd | 00545570 | 19/09/1996 | 22/06/2000 | Dissolved |