| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ELGIN SAND AND GRAVEL LIMITED | SC408249 | 27/09/2011 | Dissolved |
| Ta Civils | SC100681 | 29/03/1989 | Dissolved |
| Ta Dundee | SC100682 | 29/03/1989 | Dissolved |
| Ta Edinburgh | SC100607 | 29/03/1989 | Dissolved |
| Ta Geotechnical | SC102374 | 31/12/1988 | Dissolved |
| Ta Glasgow | SC100683 | 29/03/1989 | Dissolved |
| Ta London | SC100684 | 29/03/1989 | Dissolved |
| Ta Special Projects | SC100685 | 29/03/1989 | Dissolved |
| Thorburn Computing Ltd | SC047491 | 29/03/1989 | Dissolved |
| WMR CONSULTANCY LIMITED | SC220313 | 15/06/2001 | Dissolved |
| WMR TECHNICAL SERVICES LIMITED | SC633072 | 11/06/2019 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Ensphere (U K) Ltd | SC108973 | 31/07/1989 | 31/03/2000 | Dissolved |
| R & D STEEL BUILDINGS LTD. | SC246259 | 27/03/2007 | 01/05/2019 | Strike Off |
| Stressprobe Ltd | SC070466 | 29/03/1989 | 31/03/2000 | Dissolved |
| THORBURN COLQUHOUN HOLDINGS LIMITED | SC085696 | 01/05/1995 | 08/11/1995 | Not Trading |
| THORBURN INVESTMENTS LIMITED | SC075199 | 29/03/1989 | 31/03/2000 | Dissolved |
| URS CORPORATION LIMITED | SC118271 | 09/11/1995 | 31/03/2000 | Gold |
| WOODWARD-CLYDE LIMITED | SC136353 | 01/05/1995 | 08/11/1995 | Dissolved |