| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Firecrest Business Systems Limited | 02821705 | 27/06/1996 | Dissolved |
| Five Nines Commerce Ltd | 03905653 | 09/11/2005 | Dissolved |
| Momentum Systems Ltd | 03784038 | 09/11/2005 | Dissolved |
| Northdoor Computer Co Ltd | 01572160 | 27/06/1996 | Dissolved |
| Northdoor Systems Ltd | 02337475 | 27/06/1996 | Dissolved |
| Northdoor Training Ltd | 02192461 | 27/06/1996 | Dissolved |
| Platinum Blue 2004 Ltd | 03136427 | 09/11/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| NORTHDOOR PLC | 02192480 | 27/06/1996 | 29/03/2016 | Silver |
| PLATINUM BLUE LIMITED | 03783500 | 09/11/2005 | 29/03/2016 | Not Trading |