| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Abingworth Tritec Management Ltd | 03136021 | 17/01/1996 | Dissolved |
| Eden I.P. Limited | 02556300 | 20/03/1992 | Dissolved |
| Tritech Investment Managers Ltd | 03336627 | 20/03/1997 | Dissolved |
| Weston Antennas Ltd | 01925871 | 26/02/1999 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| 3I PLC | 00397156 | 08/08/1992 | 31/12/1992 | Silver |
| ADTRAN NETWORKS (UK) LIMITED | 03593238 | 26/10/1998 | 13/07/2000 | Amber |
| ADVENT 2 FUND MANAGERS LIMITED | 03492713 | 30/01/1998 | 31/12/2007 | Dissolved |
| ADVENT GPIC LIMITED | 04020311 | 15/09/2000 | 31/12/2007 | Dissolved |
| ADVENT LIMITED | 02191603 | 16/03/1998 | 31/12/2007 | Dissolved |
| ADVENT MANAGEMENT II LIMITED | SC180199 | 15/06/1998 | 31/12/2007 | Dissolved |
| ADVENT MANAGEMENT III LIMITED | SC209205 | 18/09/2000 | 31/12/2007 | Dissolved |
| ADVENT MANAGEMENT IV LIMITED | SC270227 | 20/09/2004 | 31/12/2007 | Dissolved |
| ADVENT MANAGEMENT LIMITED | SC082734 | 30/06/2000 | 31/12/2007 | Dissolved |
| ADVENT NOMINEES LIMITED | 02051962 | 30/06/2000 | 31/12/2007 | Dissolved |
| ADVENT TRUSTEE LIMITED | 02308928 | 30/06/2000 | 31/12/2007 | Dissolved |
| ADVENT VENTURE PARTNERS LLP | OC302716 | 26/07/2002 | 07/07/2009 | Dissolved |
| AVEVA GROUP LIMITED | 02937296 | 27/10/1994 | 30/09/1998 | Silver |
| AXONICS WOMEN'S HEALTH LIMITED | 03145216 | 30/06/2000 | 08/03/2006 | Amber |
| BANWELL PLACE MANAGEMENT LIMITED | 09142224 | 19/12/2019 | 30/06/2022 | Gold |
| CELOXICA HOLDINGS LIMITED | 03870674 | 07/09/2001 | 02/07/2008 | Gold |
| Centre for Exploitation of Science & Technology | 02196956 | 14/12/1991 | 20/11/1992 | Dissolved |
| Dietbrown Technologies Ltd | 02459517 | 02/08/1998 | 21/11/2001 | Dissolved |
| Displaymate Touchscreens Ltd | 03767243 | 04/11/1999 | 06/06/2000 | Dissolved |
| Dormco 2004 Ltd | 03094237 | 24/04/1997 | 16/05/2000 | Dissolved |
| Elam-T Ltd | 03748505 | 15/11/2001 | 16/09/2003 | Dissolved |
| FORESIGHT FUND MANAGERS LIMITED | 03135882 | 07/05/1998 | 14/01/2002 | Amber |
| INCA DIGITAL PRINTERS LIMITED | 03951260 | 24/05/2000 | 02/10/2003 | Amber |
| INGRAM MICRO HOLDINGS LIMITED | 01913344 | 22/03/1991 | 02/04/1991 | Silver |
| International Business Software Ltd | 02252032 | 30/06/1991 | 02/04/1992 | Dissolved |
| Jomed Imaging Ltd | 02144826 | 11/10/1994 | 31/12/1998 | Dissolved |
| KOGNITIO LIMITED | 02127833 | 10/07/1992 | 25/09/1996 | Dissolved |
| MFLEX UK LIMITED | 03880306 | 21/08/2000 | 01/07/2004 | Dissolved |
| NOISIVAREC LIMITED | 03191734 | 19/08/1997 | 26/11/1998 | Insolvent |
| Optical Micro Devices Ltd | 03851226 | 17/05/2000 | 14/11/2001 | Dissolved |
| ROCKSURE PROPERTY LTD | 05536252 | 15/04/2017 | 31/01/2019 | Dissolved |
| S D L Integrated Optics Ltd | 02626806 | 23/10/1991 | 25/05/1999 | Dissolved |
| Sahomu Holdings Ltd | 01629492 | 11/12/1991 | 11/12/1993 | Dissolved |
| Sahomu Ltd | 02220953 | 30/08/1991 | 18/12/1992 | Dissolved |
| Scorpion Technologies (Uk) Ltd | 02356670 | 08/08/1997 | 31/12/1998 | Dissolved |
| Sdl (Uk) Ltd | 03131731 | 29/01/1996 | 25/05/1999 | Dissolved |
| THE ROCKSURE GROUP LIMITED | 10440123 | 12/01/2018 | 24/01/2020 | Amber |
| TRUMPF LASER PLC | 05546901 | 28/09/2005 | 09/11/2007 | Silver |
| Wireless Systems International Ltd | 03005432 | 29/05/1999 | 18/01/2001 | Dissolved |
| XAAR PLC | 03320972 | 04/07/2011 | 13/05/2015 | Gold |