| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| R H I Refractories Spaeter (U K) Ltd | 02201142 | 28/10/1996 | Dissolved |
| Thor Ceramics Ltd | SC212251 | 16/01/2001 | Dissolved |
| Thor Technology Ltd | SC079601 | 17/12/1991 | Dissolved |
| Thor Technology Ltd | SC079601 | 07/10/1994 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BUSINESS ENTERPRISE SCOTLAND | SC163604 | 18/09/2008 | 01/02/2016 | Dissolved |
| GIX INTERNATIONAL LIMITED | 03089096 | 01/01/2009 | 27/04/2012 | One Red Flag |
| INDRESCO U.K.LIMITED | 02682298 | 01/01/2009 | 27/04/2012 | Dissolved |
| MAYERTON REFRACTORIES (EUROPE) LIMITED | 03657058 | 28/02/2014 | 31/10/2014 | Silver |
| MAYERTON REFRACTORIES (UKAAS) LTD | 06217933 | 28/02/2014 | 31/10/2014 | Amber |
| RHI REFRACTORIES (SITE SERVICES) LIMITED | 03523514 | 01/04/1999 | 06/11/2001 | Dissolved |
| RHI REFRACTORIES (SITE SERVICES) LIMITED | 03523514 | 06/11/2001 | 26/04/2012 | Dissolved |
| RHI REFRACTORIES UK LIMITED | SC075200 | 17/12/1991 | 31/12/1999 | Bronze |
| RHI REFRACTORIES UK LIMITED | SC075200 | 01/10/1994 | 27/04/2012 | Bronze |
| SCOTTISH ENTERPRISE DUNBARTONSHIRE | SC130793 | 26/06/2003 | 31/03/2008 | Not Trading |
| THE LENNOX PARTNERSHIP LIMITED | SC111183 | 18/03/1997 | 02/11/2018 | Gold |
| THE LOCH LOMOND STEAMSHIP COMPANY | SC160932 | 02/07/2018 | 31/12/2020 | One Red Flag |
| TULLOCHAN | SC219319 | 07/08/2001 | 01/11/2004 | Silver |