| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 21 SEYMOUR STREET LIMITED | 02953826 | 23/03/2011 | Bronze |
| BERKELEY STREET NOMINEES LIMITED | 06073998 | 23/03/2011 | Not Trading |
| CAPITAL 44 LLP | OC317993 | 05/09/2006 | Dissolved |
| COLVILLE ESTATE LIMITED(THE) | 00139670 | 04/07/2012 | Bronze |
| COLVILLE ESTATE PROPERTIES LIMITED | 02428557 | 04/07/2012 | Silver |
| Jones Lang Wootton International | 02688053 | 16/09/1993 | Dissolved |
| PORTMAN SETTLED ESTATES LIMITED | 01055334 | 12/10/2011 | Bronze |
| SEYMOUR STREET NOMINEES LIMITED | 01711120 | 23/03/2011 | Not Trading |
| THE PORTMAN ESTATE (PRIMARY) LIMITED | 09967998 | 14/10/2024 | Not Trading |
| THE PORTMAN ESTATE NOMINEES (ONE) LIMITED | 05175327 | 15/12/2010 | Not Trading |
| THE PORTMAN ESTATE NOMINEES (TWO) LIMITED | 05175370 | 15/12/2010 | Not Trading |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AGE UK ENTERPRISES (WESTMINSTER) LTD | 02895229 | 25/07/2002 | 28/04/2005 | Silver |
| AGE UK WESTMINSTER | 02788761 | 06/12/2001 | 28/04/2005 | Silver |
| BPF COMMERCIAL LIMITED | 03672922 | 19/06/2003 | 14/06/2006 | Amber |
| BRIGHTSEA EPH LIMITED | 03744674 | 22/12/2005 | 01/05/2007 | Dissolved |
| BRITISH PROPERTY FEDERATION | 00778293 | 10/07/2002 | 11/07/2006 | Silver |
| BRITISH PROPERTY FEDERATION (EUROPE) LIMITED | 03374309 | 19/06/2003 | 14/06/2006 | Dissolved |
| DOWNE HOUSE SCHOOL | 02645228 | 14/06/2006 | 19/11/2015 | Silver |
| ELIZABETH FINN CARE | 00515297 | 13/12/2005 | 29/03/2011 | Silver |
| ELIZABETH FINN HOMES LIMITED | 05225008 | 22/02/2006 | 15/02/2011 | Bronze |
| EVANS MANAGEMENT LIMITED | 06067833 | 01/07/2012 | 31/03/2018 | Gold |
| JONES LANG LASALLE LIMITED | 01188567 | 20/12/1992 | 23/02/1999 | Gold |
| PS&N DEVELOPMENTS LIMITED | 07485704 | 01/07/2011 | 14/01/2016 | Not Trading |