| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AQUILYS INVESTMENT MANAGEMENT LTD | 09293385 | 03/11/2014 | Dissolved |
| AQUILYS LIMITED | 09783944 | 18/09/2015 | Dissolved |
| BAZALGETTE TUNNEL LIMITED | 09553573 | 19/08/2015 | Silver |
| CICAP LIMITED | 02858938 | 14/10/2013 | Silver |
| COLLER CAPITAL LIMITED | 03020017 | 12/08/2020 | One Red Flag |
| ENTERPRISE M3 LIMITED | 11897237 | 01/08/2021 | Dissolved |
| PENCILWEIGHT LIMITED | 06544895 | 31/03/2008 | Amber |
| THAMES BRIDGE CAPITAL LIMITED | 08252016 | 12/10/2012 | Dissolved |
| THAMES TIDEWAY TUNNEL LIMITED | 08751040 | 18/08/2015 | Dissolved |
| WESTIE INVESTMENTS LIMITED | 11051760 | 07/11/2017 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| 3I ASSET MANAGEMENT LIMITED | 01629911 | 19/02/1998 | 29/01/2002 | Dissolved |
| 3I DM EUROPE LIMITED | 07381134 | 15/02/2011 | 17/05/2012 | Dissolved |
| 3I EF3 GPB LIMITED | 03809756 | 14/07/1999 | 13/01/2006 | Dissolved |
| 3I GROUP PLC | 01142830 | 09/07/1997 | 17/05/2012 | Gold |
| 3I HOLDINGS PLC | 02591431 | 10/09/1997 | 17/05/2012 | Bronze |
| 3I INTERNATIONAL HOLDINGS | 00395557 | 13/01/2003 | 12/01/2011 | Not Trading |
| 3I INVESTMENTS PLC | 03975789 | 13/04/2000 | 17/05/2012 | Gold |
| 3I JAPAN GP LIMITED | 00894864 | 22/07/1997 | 27/04/1998 | Dissolved |
| 3I PLC | 00397156 | 01/01/1996 | 17/05/2012 | Silver |
| AWG PARENT CO LIMITED | 03936645 | 25/01/2007 | 12/10/2007 | Amber |
| BLACKWELL PARK LTD | 09002678 | 23/04/2018 | 01/01/2023 | One Red Flag |
| GARDENS PENSION TRUSTEES LIMITED | 00888568 | 02/08/2005 | 03/02/2009 | Not Trading |
| LANDMARK MORTGAGES LIMITED | 03273685 | 05/01/2005 | 01/05/2008 | Silver |
| MAYFLOWER GP LIMITED | 01629915 | 10/09/1997 | 30/01/2001 | Dissolved |
| OSPREY ACQUISITIONS LIMITED | 05915896 | 25/01/2007 | 12/10/2007 | Silver |
| OSPREY HOLDCO LIMITED | 05915869 | 25/01/2007 | 12/10/2007 | Amber |
| PA CONSULTING HOLDINGS LIMITED | 08249452 | 07/12/2012 | 11/12/2015 | One Red Flag |
| SHIP MORTGAGE FINANCE COMPANY PUBLIC LIMITED COMPANY | 00493234 | 13/11/1997 | 31/08/2010 | Dissolved |
| THE BRITISH PRIVATE EQUITY AND VENTURE CAPITAL ASSOCIATION | 01697461 | 16/01/2001 | 01/04/2004 | Gold |