| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cox Associates Ltd | 02753646 | 07/10/1993 | Dissolved |
| DELTATEL LIMITED | 01960783 | 26/11/1991 | Bronze |
| Grantham House Ltd | 01240508 | 01/08/1996 | Dissolved |
| Grantham House Ltd | 01240508 | 01/08/1996 | Dissolved |
| Installation Ltd | 02137326 | 28/02/1992 | Dissolved |
| Ketsiv Ltd | 01949284 | 12/10/1991 | Dissolved |
| Telcor (U K) Ltd | 02858592 | 08/06/1994 | Dissolved |
| Vistek Holdings Ltd | 01946014 | 30/11/1991 | Dissolved |
| Vistek Research Ltd | 03231524 | 30/07/1996 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| COMMZ LTD | 07453240 | 29/11/2010 | 23/02/2022 | One Red Flag |
| Vistek Ltd | 02732945 | 21/08/1992 | 31/03/2002 | Dissolved |