| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALTERRA CAPITAL SERVICES UK LIMITED | 06864344 | 04/06/2019 | Dissolved |
| ARAG PLC | 02585818 | 03/04/2024 | Silver |
| Brockbank Personal Lines Ltd | 01224970 | 19/07/2004 | Dissolved |
| Brockbank Syndicate Services Ltd | 01776350 | 19/07/2004 | Dissolved |
| Cassidy Brockbank Ltd | 02725828 | 22/07/2004 | Dissolved |
| Denham Legal & Professional Risks Ltd | 03200096 | 19/07/2004 | Dissolved |
| Denham Syndicate Management Ltd | 03576087 | 19/07/2004 | Dissolved |
| XL INSURANCE COMPANY PLC | 01884214 | 13/12/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ABBEY PROTECTION LIMITED | 06352358 | 03/12/2019 | 31/07/2020 | Silver |
| ACCOUNTAX LAW LTD | 06500806 | 01/01/2020 | 31/07/2020 | Strike Off |
| ACCTX CONSULTING LIMITED | 03842083 | 01/01/2020 | 31/07/2020 | Strike Off |
| ACCTX UK LIMITED | 03246351 | 01/01/2020 | 31/07/2020 | Strike Off |
| ALTERRA AT LLOYD'S LIMITED | 03304600 | 03/12/2019 | 31/07/2020 | Gold |
| ALTERRA CAPITAL AMERICA LIMITED | 07396259 | 03/12/2019 | 31/07/2020 | Not Trading |
| ALTERRA CAPITAL BRAZIL LIMITED | 07343517 | 03/12/2019 | 31/07/2020 | Gold |
| ALTERRA CAPITAL UK LIMITED | 05800142 | 03/12/2019 | 31/07/2020 | Silver |
| ALTERRA CORPORATE CAPITAL 2 LIMITED | 03703210 | 03/12/2019 | 31/07/2020 | Bronze |
| ALTERRA CORPORATE CAPITAL 3 LIMITED | 04513846 | 03/12/2019 | 31/07/2020 | Bronze |
| ALTERRA CORPORATE CAPITAL 4 LIMITED | 04598913 | 03/12/2019 | 31/07/2020 | Dissolved |
| ALTERRA CORPORATE CAPITAL 5 LIMITED | 05227741 | 03/12/2019 | 31/07/2020 | Dissolved |
| ALTERRA CORPORATE CAPITAL 6 LIMITED | 04257467 | 03/12/2019 | 31/07/2020 | Dissolved |
| BROCKBANK HOLDINGS LIMITED | 03108438 | 19/07/2004 | 09/04/2010 | Dissolved |
| DORNOCH LIMITED | 03087772 | 24/06/2004 | 31/03/2010 | Gold |
| EC INSURANCE COMPANY LIMITED | 01266206 | 06/03/2019 | 31/07/2020 | Dissolved |
| EFFECTIVE TAX SOLUTIONS LTD | 06793529 | 01/01/2020 | 31/07/2020 | Dissolved |
| GRACECHURCH UTG NO. 200 LIMITED | 03228029 | 28/07/2005 | 31/03/2010 | Dissolved |
| GRACECHURCH UTG NO. 201 LIMITED | 03087770 | 24/06/2004 | 31/03/2010 | Dissolved |
| GRACECHURCH UTG NO. 202 LIMITED | 03360374 | 24/06/2004 | 31/03/2010 | Dissolved |
| HAMILTON CORPORATE MEMBER LIMITED | 05996460 | 01/09/2016 | 31/12/2018 | Silver |
| HAMILTON UK HOLDINGS LIMITED | 09241836 | 01/09/2016 | 31/12/2018 | Gold |
| HAMILTON UK SERVICES LIMITED | 11381012 | 24/05/2018 | 31/12/2018 | Amber |
| HAMILTON UNDERWRITING LIMITED | 06684157 | 09/12/2015 | 31/12/2018 | Dissolved |
| MARKEL CAPITAL HOLDINGS LIMITED | 06722095 | 03/12/2019 | 31/07/2020 | Silver |
| MARKEL CAPITAL LIMITED | 03114572 | 03/12/2019 | 31/07/2020 | Silver |
| MARKEL EUROPE LIMITED | 07068110 | 03/12/2019 | 31/07/2020 | Dissolved |
| MARKEL INTERNATIONAL HOLDINGS LIMITED | 11314497 | 03/12/2019 | 31/07/2020 | Silver |
| MARKEL INTERNATIONAL INSURANCE COMPANY LIMITED | 00966670 | 06/03/2019 | 31/07/2020 | Silver |
| MARKEL INTERNATIONAL SERVICES LIMITED | 00932977 | 03/12/2019 | 31/07/2020 | Silver |
| MARKEL SYNDICATE MANAGEMENT LIMITED | 03114590 | 06/03/2019 | 31/07/2020 | Silver |
| XL INSURANCE (UK) HOLDINGS LIMITED | 04209169 | 14/10/2009 | 31/07/2015 | Gold |
| XL INSURANCE COMPANY PLC | 01884214 | 02/08/2005 | 31/03/2010 | Dissolved |
| XL LONDON MARKET GROUP LIMITED | 01844295 | 16/06/2005 | 31/03/2010 | Dissolved |
| XL LONDON MARKET LTD | 01515647 | 18/11/2003 | 31/03/2010 | Gold |
| XL LONDON MARKET SERVICES LTD | 03108265 | 20/10/2005 | 31/03/2010 | Dissolved |
| XL SERVICES UK LIMITED | 02816304 | 02/09/2009 | 30/06/2015 | Dissolved |