| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cambridge Analysing Instruments Ltd | 00593774 | 01/10/1991 | Dissolved |
| Cambridge Automatic Controls Ltd | 00529213 | 01/10/1991 | Dissolved |
| Image Analysing Computers Ltd | 01443667 | 01/10/1991 | Dissolved |
| Leica Plc | 01449208 | 01/10/1992 | Dissolved |
| Londex Ltd | 00315008 | 01/10/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAMBRIDGE INSTRUMENTS LIMITED | 00303665 | 01/10/1991 | 31/03/1995 | Dissolved |
| FLOW GROUP TRUSTEES LIMITED | 06930640 | 30/09/2011 | 02/11/2011 | Dissolved |
| JOHNSON RADLEY LIMITED | 02212143 | 16/06/1995 | 06/04/2000 | Insolvent |
| Johnson Radley Engineering Ltd | 02960711 | 16/06/1995 | 06/04/2000 | Dissolved |
| Johnson Radley Foundry Ltd | 04451135 | 06/08/2002 | 19/04/2004 | Dissolved |
| LEICA MICROSYSTEMS CAMBRIDGE LIMITED | 02690018 | 23/08/1993 | 31/03/1995 | Gold |
| Leica Microsystems Cambridge 2 Ltd | 00914067 | 18/12/1991 | 31/03/1995 | Dissolved |
| Raisefocus Ltd | 02695941 | 23/03/1992 | 31/03/1995 | Dissolved |
| SHIPHAM VALVES LIMITED | 02532854 | 01/03/2004 | 03/10/2011 | Insolvent |
| THORNHILL HEAT EXCHANGERS LIMITED | 02370591 | 01/12/2008 | 30/10/2009 | One Red Flag |
| YORK SCIENCE PARK LIMITED | 02939132 | 26/04/2001 | 31/12/2016 | Silver |