| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Bath Technology Ltd | 04032626 | 31/05/2001 | Dissolved |
| Data Perspective Ltd | 05538181 | 13/06/2006 | Dissolved |
| Electronic Transaction Processing Limited | 02348221 | 05/01/1991 | Dissolved |
| Flexion Systems Ltd | 03398240 | 30/06/2000 | Dissolved |
| Flexion Systems Ltd | 03398240 | 03/03/1998 | Dissolved |
| KINGS ARMS YARD VCT 2 PLC | 04063505 | 30/10/2000 | Dissolved |
| Nuko 10 Ltd | 03635797 | 15/07/1999 | Dissolved |
| OXFORD HEYDERUM LIMITED | 03538912 | 21/04/1998 | Dissolved |
| PROMETHEAN PARTICLES LIMITED | 06427290 | 28/04/2008 | Amber |
| RESILIENT (HOLDINGS) LIMITED | 08233891 | 20/08/2015 | Bronze |
| RESILIENT LIMITED | 01403177 | 20/12/2012 | One Red Flag |
| TTE SYSTEMS LIMITED | 05058157 | 22/10/2009 | Dissolved |
| Voxent Systems Ltd | 04551958 | 02/10/2002 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ALBION KAY VCT PLC | 03139019 | 03/10/2011 | 23/05/2014 | Gold |
| Airtech Computer Security Ltd | 01959007 | 22/12/1991 | 30/09/1997 | Dissolved |
| Airtech Security Ltd | 02017579 | 31/01/1992 | 30/09/1997 | Dissolved |
| Airtech Syncresys Ltd | 02773550 | 11/03/1993 | 30/09/1997 | Dissolved |
| Computer Security Consultants Ltd | 02034892 | 05/01/1991 | 16/05/1994 | Dissolved |
| Computer Security Engineering Ltd | SC070094 | 01/08/1990 | 16/05/1994 | Dissolved |
| Computer Security Ltd | 01952277 | 22/12/1991 | 30/09/1997 | Dissolved |
| Computer Security Manufacturing Ltd | SC066687 | 01/08/1990 | 16/05/1994 | Dissolved |
| Computer Security Systems Ltd | SC093996 | 01/08/1990 | 16/05/1994 | Dissolved |
| GYROMETRIC SYSTEMS LIMITED | 05154449 | 01/01/2009 | 19/08/2021 | Gold |
| Multiteq Ltd | 02017588 | 05/01/1991 | 16/03/1992 | Dissolved |
| PERPETUUM LIMITED | 05145240 | 06/12/2004 | 13/02/2006 | Dissolved |
| Software Forge Ltd | 01751247 | 16/04/1993 | 30/10/1996 | Dissolved |
| THALES E-SECURITY LIMITED | 02518805 | 05/07/1991 | 05/09/1997 | Not Trading |
| TREND MICRO (ENCRYPTION) LIMITED | 04613573 | 10/04/2003 | 29/01/2008 | Dissolved |