| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BRIGGS AMASCO LIMITED | 03541311 | 16/06/1998 | Gold |
| GLOBAL CONFERENCE MANAGEMENT LIMITED | 03071433 | 02/02/1996 | Insolvent |
| THE SPECIALIST WATERPROOFING GROUP LIMITED | 04246517 | 09/11/2001 | Silver |
| WILLIAM BRIGGS & SONS LIMITED | 02548605 | 26/11/2001 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| APERTURE LIMITED | 02186934 | 23/11/2004 | 17/07/2015 | Dissolved |
| HYFLEX ROOFING LIMITED | 02849114 | 23/11/2004 | 17/07/2015 | Dissolved |
| IKO HOLDINGS PLC | 02446447 | 12/12/2006 | 03/05/2023 | Bronze |
| IKO INSULATIONS UK LIMITED | 08188653 | 23/08/2012 | 15/06/2016 | Silver |
| MAURICE HILL LIMITED | 01036456 | 30/09/2002 | 17/07/2015 | Dissolved |
| ROOF INTEGRITY LIMITED | 11581646 | 21/09/2018 | 24/12/2018 | Gold |
| THE FLAT ROOFING ALLIANCE | 03412540 | 10/10/2002 | 31/08/2010 | Dissolved |