| Compre Holdings Limited | London | 1991 |
| Comprehensive Financial Planning Limited | Oswestry | 2010 |
| Comprehensive Risk Holdings Limited | London | 2021 |
| Compressor Controls UK Limited | Bracknell | 2008 |
| Compressor HQ Holdings Ltd | Rossendale | 2026 |
| Compro Renewable Energy Ltd | Corby | 2017 |
| Comprocompro Ltd | London | 2022 |
| Comptavest Ltd | London | 2025 |
| Comptec Holdings Limited | Walsall | 2019 |
| Compton Acres DP Limited | Birmingham | 2017 |
| Compton Asset Holdings Limited | Winchester | 2026 |
| Compton Financial Services Ltd | Farnham | 2019 |
| Compton Green Limited | Banbury | 2024 |
| Compton Hart Ltd | Nuthampstead | 2020 |
| Compton Insurance Services Limited | Swansea | 1992 |
| Compton Investment Management Limited | Swansea | 2025 |
| Compton Land Management Ltd | Sherborne | 2026 |
| Compu Tax (S.W.) Ltd | Lostwithiel | 1998 |
| Compucorp Holdings Limited | Hemel Hempstead | 2019 |
| Compurse Limited | London | 2025 |
| Computacenter Germany Holdings Limited | Hatfield | 2025 |
| Computacenter Group Holdings Limited | Hatfield | 2025 |
| Computair Holdings Limited | Dunstable | 2023 |
| Computational Finance Limited | London | 2016 |
| Compute Capital Limited | Romsey | 2025 |
| Computeam Topco Limited | Stockport | 2024 |
| Computer MAN Limited | | 1998 |
| Computer Software Holdings Limited | Birmingham | 2006 |
| Computerlinks (UK) Limited | Harrogate | 1996 |
| Computershare Advantage Payment Services Limited | Bristol | 2025 |
| Computershare Advantage Trustees Limited | Bristol | 2025 |
| Computershare Investor Services PLC | Bristol | 1998 |
| Computershare Trustees Limited | Bristol | 1998 |
| Computershares Holdings Limited | London | 2025 |
| Computerworld Group Limited | Bristol | 2018 |
| Computhelp Limited | Brook Road, London | 1995 |
| Computime Holdings Limited | Leeds | 2022 |
| Computionics Group Limited | Lancashire | 2005 |
| Comqi Holdings Ltd | Stanmore | 2007 |
| Comrádaí Holdings Limited | Coventry | 2025 |
| Comstead (Mechanical Services) Limited | Birmingham | 2004 |
| Comstore Limited | Portsmouth | 2026 |
| Comtech UK Holdings Limited | Salford | 2020 |
| Comtek Holdings (UK) Limited | Thetford | 2014 |
| Comunity Systems Holdings Limited | Brentwood | 2024 |
| Comus Capital Ltd | London | 2026 |
| Comus Holdings Limited | Stoke On Trent | 2021 |
| Comyn Ching (1723) Limited | Gorseinon | 1920 |
| Comyn Ching Limited | Gorseinon | 2005 |
| CON Mech Durham 1 Limited | County Durham | 1989 |
| CON Mech Holdings Limited | Darlington | 2019 |
| CON Mech Paddocks Limited | Sevenoaks | 2019 |
| CON Mech Suffolk Limited | Sevenoaks | 2019 |
| Con&Cub Ltd | London | 2026 |
| Con-Tec Holdings Ltd | Sale | 2025 |
| Cona Limited | London | 2023 |
| Conaghan & Company Limited | London | 2015 |
| Conan Jeken Consulting Ltd | London | 2018 |
| Conan UK Finco Limited | London | 2020 |
| Conan UK Holdco Limited | London | 2020 |
| Conance Limited | Barnet | 1985 |
| Conantur Capital Ltd. | London | 2016 |
| Conatus Holdings Limited | Ipswich | 2020 |
| Conatus Partners Ltd | London | 2020 |
| Concal Holdings Limited | Strabane | 2025 |
| Concas Ventures Ltd | London | 2019 |
| Concause Limited | Brentwood | 2024 |
| Concentric Capital Group Ltd | High Wycombe | 2026 |
| Concentric Capital Partners Limited | London | 2025 |
| Concentric Holdings Limited | Keighley | 2019 |
| Concentric Nominees Limited | London | 2021 |
| Concentric Overseas Limited | Redditch | 1976 |
| Concentric Solutions Group Limited | London | 2025 |
| Concentric Team Technology I GP Limited | London | 2016 |
| Concentric Team Technology II GP Limited | London | 2021 |
| Concentric US Finance 2 Limited | Redditch | 2013 |
| Concentric US Finance 3 Limited | Worcestershire | 2021 |
| Concept 6 Management Company Ltd | Cardiff | 2022 |
| Concept Automotive Limited | Manchester | 2003 |
| Concept Business Solutions Limited | Usk | 2006 |
| Concept Capital Corporation Ltd | Bristol | 2024 |
| Concept Chemicals Holdings Ltd | Denton | 2025 |
| Concept City Limited | Peterborough | 2023 |
| Concept Claims Management Ltd | Huntingdon | 2024 |
| Concept CNC South Limited | Bristol | 2022 |
| Concept Commercial & Bridging Finance Limited | Wirral | 2025 |
| Concept Commercial Finance Limited | Crewe | 2018 |
| Concept Commercial Holdings Limited | Rawtenstall | 2015 |
| Concept Conversions Holdings Limited | Northampton | 2018 |
| Concept Elevators (Holdings) Limited | Cannock | 2011 |
| Concept Estate Planning Ltd | Reigate | 2021 |
| Concept Financial Management Limited | Woking | 2001 |
| Concept Financial Planning Ltd | Reigate | 2007 |
| Concept Group Holdings Limited | London | 2023 |
| Concept Holdings (NW) Limited | Nelson | 2018 |
| Concept Holdings (Surrey) Limited | Weybridge | 2016 |
| Concept Launch Holdings Limited | Kettering | 2023 |
| Concept Leisure Ltd | Salford | 2019 |
| Concept Life Sciences (Midco) Limited | Chapel-En-Le-Frith | 2014 |
| Concept Marine Group Limited | Truro | 2024 |