| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Alta Construction Services Ltd | 03826699 | 15/03/2000 | Dissolved |
| Alta Management Services Ltd | 02277639 | 15/01/2001 | Dissolved |
| BIRMINGHAM RESEARCH AND DEVELOPMENT LIMITED | 02108517 | 31/12/2001 | Dissolved |
| David & Company Limited | 01941226 | 30/09/1990 | Dissolved |
| Flowmetrics Ltd | 02341140 | 31/12/2001 | Dissolved |
| Speed 9667 Ltd | 04313433 | 27/11/2001 | Dissolved |
| TAURUS MANAGEMENT CONSULTANTS LIMITED | 07146457 | 04/02/2010 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALTA BIRMINGHAM CHINA LIMITED | 05532861 | 10/08/2005 | 15/10/2010 | Silver |
| Hyper Technology Ltd | 04797355 | 24/09/2003 | 07/07/2004 | Dissolved |
| VICEROY CLOSE LIMITED | 02249424 | 23/06/2010 | 28/02/2019 | Silver |