| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| VINTAGE ASSOCIATES LIMITED | 04286438 | 17/09/2001 | Dissolved |
| Vintage Associates Limited | 02857829 | 28/09/1993 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| GEOSCAN LIMITED | 02301350 | 08/01/1992 | 30/11/2015 | Dissolved |
| SPECTRUM DATAGRAPHIC SYSTEMS INTERNATIONAL LIMITED | 02046024 | 24/11/1991 | 30/11/2015 | Dissolved |
| SPECTRUM ENERGY AND INFORMATION TECHNOLOGY LIMITED | 06266892 | 01/06/2007 | 30/11/2015 | Dissolved |
| SPECTRUM GEO LIMITED | 01979422 | 10/11/1991 | 30/11/2015 | Bronze |
| SPECTRUM GEOPHYSICAL SERVICES LIMITED | 01309396 | 10/11/1991 | 30/11/2015 | Dissolved |
| SPECTRUM INFORMATION TECHNOLOGY LIMITED | 01588885 | 10/11/1991 | 30/11/2015 | Dissolved |
| SPECTRUM RESOURCES LIMITED | 02236114 | 20/05/1991 | 30/11/2015 | Dissolved |
| SPECTRUMITECH LIMITED | 04391906 | 19/03/2002 | 12/04/2012 | Bronze |
| VALHALLA OIL AND GAS LIMITED | 05498467 | 04/07/2005 | 31/01/2006 | Bronze |