| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Tubemasters Profiling Ltd | 03703665 | 28/01/1999 | Dissolved |
| Tubemasters Site Services Ltd | 03129740 | 23/11/1995 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BARKSTON ASH FABRICATIONS LTD | 10910974 | 11/08/2017 | 07/09/2020 | Dissolved |
| BIRKBECK STRUCTURES LIMITED | 10227005 | 17/07/2020 | 18/10/2021 | One Red Flag |
| FABSEC LIMITED | 04153086 | 12/03/2013 | 11/04/2013 | Bronze |
| SEVERFIELD COMMERCIAL & INDUSTRIAL LIMITED | 02668795 | 18/01/2011 | 12/04/2013 | Silver |
| TUBEMASTERS LIMITED | 01813102 | 01/03/1993 | 31/01/2002 | Dissolved |
| Tubemasters Profiling Ltd | 03703665 | 28/01/1999 | 18/01/2000 | Dissolved |
| WATSON STEEL STRUCTURES LIMITED | 04313355 | 18/02/2002 | 12/04/2013 | Dissolved |
| WILLIAM HARE LIMITED | 00399212 | 06/04/2014 | 03/05/2017 | Silver |