| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Asat (U K) Ltd | 02727430 | 05/08/1992 | Dissolved |
| Mandaco 290 Ltd | 04328724 | 22/01/2002 | Dissolved |
| Newport Wafer-Fab Ltd | 02739765 | 07/12/1992 | Dissolved |
| Newport Wafer-Fab Ltd | 02739765 | 01/09/1993 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ESM LIMITED | 03772186 | 06/07/1999 | 17/05/2000 | Dissolved |
| European Semiconductor Manufacturing Ltd | 03769276 | 02/08/1999 | 17/05/2000 | Dissolved |
| IQE (EUROPE) LIMITED | 02107558 | 29/08/2000 | 07/03/2003 | Bronze |
| IQE PLC | 03745726 | 01/01/2001 | 07/03/2003 | Amber |
| IQE SILICON COMPOUNDS LIMITED | 03986643 | 01/12/2000 | 07/03/2003 | One Red Flag |
| WAFER TECHNOLOGY INTERNATIONAL LIMITED | 02928144 | 22/11/2000 | 07/03/2003 | Gold |
| WAFER TECHNOLOGY LIMITED | 01829722 | 22/11/2000 | 07/03/2003 | Silver |