| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CONSTRUCTION AND DEVELOPMENT PARTNERSHIP LTD | 06574537 | 23/04/2008 | One Red Flag |
| ENGINEERING TIMELINES | 04964786 | 14/11/2003 | Amber |
| THE WHITBYBIRD FOUNDATION | 06849934 | 17/03/2009 | Silver |
| WHITBY WOOD LIMITED | 07786822 | 26/09/2011 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CARRIG STONE CONSULTANTS UK LIMITED | 04707074 | 21/03/2003 | 30/09/2009 | Dissolved |
| DAVIES MAGUIRE LIMITED | 07370252 | 09/09/2010 | 31/01/2015 | Silver |
| DUNWICH GREYFRIARS TRUST | 07959470 | 26/07/2013 | 19/05/2017 | Silver |
| ELEMENT ENERGY LIMITED | 04646003 | 23/01/2003 | 27/04/2011 | Insolvent |
| LONDON & STROUD LIMITED | 03916342 | 31/01/2000 | 30/09/2009 | Dissolved |
| RAMBOLL MIDDLE EAST LIMITED | 02019473 | 17/07/2006 | 04/01/2010 | One Red Flag |
| RAMBOLL UK LIMITED | 03659970 | 02/11/1998 | 30/09/2009 | Gold |
| RAMBOLL WHITBYBIRD HOLDINGS LIMITED | 04079634 | 22/09/2000 | 30/09/2009 | Not Trading |
| THE NEWCOMEN SOCIETY FOR THE STUDY OF THE HISTORY OF ENGINEERING AND TECHNOLOGY | 00691545 | 01/10/2008 | 30/09/2012 | Silver |
| The-E-Shop.Co.Uk Ltd | 03948166 | 01/10/2000 | 30/09/2009 | Dissolved |
| Whitby & Bird Mep Ltd | 05678763 | 18/01/2006 | 30/09/2009 | Dissolved |
| Whitbybird Environmental Ltd | 05972032 | 19/10/2006 | 30/09/2009 | Dissolved |