| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BRITISH ASPHALT AND BITUMEN LIMITED | NI000715 | 01/04/2009 | One Red Flag |
| HAMSARD 3028 LIMITED | 05932933 | 22/12/2011 | Silver |
| HYLOAD LIMITED | 00814191 | 01/01/2009 | Dissolved |
| IKO HOLDINGS PLC | 02446447 | 01/01/2009 | Bronze |
| IKO INSULATIONS UK LIMITED | 08188653 | 23/08/2012 | Silver |
| IKO PLC | 02678296 | 01/01/2009 | Gold |
| IKO U.K. LIMITED | 03897526 | 01/01/2009 | Silver |
| MAURICE HILL LIMITED | 01036456 | 01/01/2009 | Dissolved |
| OB44 LIMITED | 14452785 | 31/10/2022 | Bronze |
| PERMANITE ASPHALT LIMITED | 02353126 | 01/01/2009 | Dissolved |
| PERMANITE LIMITED | 02423586 | 01/01/2009 | Dissolved |
| POLYGUM LIMITED | 00452935 | 01/01/2009 | Dissolved |
| ROOF INTEGRITY LIMITED | 11581646 | 21/09/2018 | Gold |
| RUBEROID INTERNATIONAL LIMITED | 02860994 | 01/01/2009 | Bronze |
| RUBEROID LIMITED | 02904444 | 01/01/2009 | Dissolved |
| RUBEROID PENSION TRUSTEE LIMITED | 06024169 | 01/01/2009 | Not Trading |
| RUBEROID PENSION TRUSTEE LIMITED | 06024169 | 05/01/2009 | Not Trading |
| RUBEROID WORKS PENSION TRUSTEE LIMITED | 06024217 | 01/01/2009 | Not Trading |
| RUBEROID WORKS PENSION TRUSTEE LIMITED | 06024217 | 05/01/2009 | Not Trading |
| RW101 LIMITED | 05619644 | 23/02/2009 | Bronze |
| THE SINGLE PLY COMPANY LIMITED | 01349826 | 01/01/2009 | Dissolved |
| THE SPECIALIST WATERPROOFING GROUP LIMITED | 04246517 | 01/01/2009 | Silver |
| THE WATERPROOFING GROUP PLC | 04278415 | 01/01/2009 | Dissolved |
| WILLIAM BRIGGS & SONS LIMITED | 02548605 | 01/01/2009 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ELECTRA STAR DANCE LIMITED | 11784137 | 23/01/2019 | 28/11/2023 | One Red Flag |
| OB 33 LIMITED | 09499286 | 19/03/2015 | 28/11/2023 | Bronze |