| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALLUVIAL DREDGES LIMITED | 00306370 | 25/05/1995 | Silver |
| CLARK & STANDFIELD LIMITED | 00455673 | 25/05/1995 | Silver |
| CLYDE MARITIME CENTRE LIMITED | SC141269 | 22/11/2022 | One Red Flag |
| FLEMING & FERGUSON, LIMITED | SC003922 | 25/05/1995 | Bronze |
| KELVIN HARBOUR LIMITED | SC370538 | 22/11/2022 | One Red Flag |
| LOBNITZ MARINE HOLDINGS LIMITED | SC155853 | 25/05/1995 | Bronze |
| Lobnitz & Co Ltd | SC066637 | 25/05/1995 | Dissolved |
| SEADREC LIMITED | SC046928 | 25/05/1995 | Silver |
| SIR J.H. BILES (NAVAL SERVICES) LIMITED | SC296327 | 23/03/2006 | Silver |
| Seadrec (London) Ltd | SC048488 | 25/05/1995 | Dissolved |
| THE INSTITUTION OF ENGINEERS AND SHIPBUILDERS IN SCOTLAND LTD | SC189633 | 22/03/2023 | Not Trading |
| THE INSTITUTION OF ENGINEERS IN SCOTLAND | SC000358 | 01/10/2013 | Amber |
| THE TALL SHIP GLENLEE TRUST | SC128338 | 15/04/2019 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CLARK & STANDFIELD LIMITED | 00455673 | 03/01/1992 | 25/03/1993 | Silver |
| SIR J.H.BILES & CO.LIMITED | 00925251 | 25/05/1995 | 01/08/2001 | Gold |
| THE INSTITUTION OF ENGINEERS AND SHIPBUILDERS IN SCOTLAND LTD | SC189633 | 17/09/2019 | 09/11/2020 | Not Trading |
| THE INSTITUTION OF ENGINEERS IN SCOTLAND | SC000358 | 01/08/2001 | 10/04/2012 | Amber |