| Clive Stainton Limited | Enfield | 2015 |
| Clive Webb Financial Services Limited | Blindley Heath | 2004 |
| Clivedale Commercial Limited | Winchester | 1963 |
| Cliveden Group Limited | London | 2010 |
| Clivedon Grove Holdings Limited | Wisbech | 2021 |
| Clixx PAY Ltd | Wolverhampton | 2026 |
| CLJ Holdings Limited | Worthing | 2023 |
| CLJ Renders Holdings Limited | Lichfield | 2014 |
| CLK Holdings Group Limited | Gravesend | 2023 |
| Clkc Holdings Ltd | Litlington | 2020 |
| Clkmrs Holding Limited | Sutton-In-Ashfield | 2024 |
| CLL Property Holdings Limited | Leicester | 2023 |
| CLM Capital Limited | Newark | 2013 |
| CLM PR Ltd | Leyland | 2021 |
| Clma Investments Ltd | Northampton | 2021 |
| Clml Holdings Ltd | Bellshill | 2021 |
| Clmm Holdings Ltd | Alperton | 2024 |
| CLN Holdings Limited | Knutsford | 2024 |
| Clns Group Limited | London | 2017 |
| CLO Finance Limited | London | 2002 |
| CLO Insulation Limited | Norwich | 2019 |
| CLO PG Limited | Castleford | 2022 |
| Cloberfield Holdings SPV Limited | Glasgow | 2022 |
| Clochar Limited | Belfast | 2018 |
| Clock and Compass Ltd | Maesteg | 2021 |
| Clock Fortress Holdings Ltd | London | 2022 |
| Clock House Holdings Topco Ltd | Slough | 2021 |
| Clock House Mortgages Limited | Beckenham | 2011 |
| Clock Like Work Ltd | London | 2024 |
| Clockhouse 2018 | London | 2018 |
| Clockhouse Studios Limited | Tunbridge Wells | 2026 |
| Clockpress Holdings Limited | Retford | 2022 |
| Clockswood Wealth Management Limited | Milton Keynes | 2025 |
| Clocktower Holdings Limited | Kensington | 2020 |
| Clocktower Support Limited | Woking | 2016 |
| Clockwise Midco Limited | London | 2025 |
| Clockwise Topco Limited | London | 2025 |
| Clockwork Asset Holdings Ltd | Chippenham | 2026 |
| Clockwork Espresso (Holdings) Limited | Durham | 2019 |
| Clockwork Family Holdings Limited | London | 2017 |
| Clockwork Financial Planning Limited | Coventry | 2016 |
| Clockwork Holdings London Limited | London | 2020 |
| Clockwork Mortgages Limited | Galashiels | 2017 |
| Clockwork Project Solutions Ltd | Olney | 2008 |
| Clockwork Ventures Ltd | London | 2024 |
| Clodhopper Limited | Leeds | 2019 |
| Cloete Design Holding (UK) Limited | Stoke On Trent | 2025 |
| Clof Victoria Nominee 1 Limited | London | 2001 |
| Clof Victoria Nominee 2 Limited | London | 2001 |
| Clogau Holdings Limited | Rhyl | 2019 |
| Cloghan Limited | Cookstown | 1992 |
| Clogher Properties Ltd | St. Albans | 2015 |
| Clogherney Property Holdings Ltd | Dungannon | 2024 |
| Cloisters Financial Management Limited | Leicester | 2003 |
| Cloke Holdings Ltd | Carmarthen | 2026 |
| Cloke Ltd | Leicester | 2026 |
| Clokkemaker Holdings Limited | London | 2023 |
| Clonallon Trading International Limited | Newry | 2015 |
| Clone Media EOT Limited | Basingstoke | 2025 |
| Clonleaf Limited | Omagh | 2017 |
| Clonmel Consultancy Limited | Peebles | 2025 |
| Clonrobin Holdings Limited | London | 2008 |
| Clonrose Developments (Ards) Limited | Belfast | 2017 |
| Clonrose Group Limited | Belfast | 2011 |
| Cloonee Investments Ltd | London | 2025 |
| Clooney Trading Limited | Limavady | 2023 |
| Clop Holdings Limited | Cheltenham | 2026 |
| Clos Joli Investments Limited | London | 2024 |
| Close Asset Finance Limited | London | 1986 |
| Close Brothers Finance PLC | | 2001 |
| Close Brothers Limited | London | 1924 |
| Close Brothers Technology Services Limited | London | 2015 |
| Close Group Holding Limited | Coventry | 2024 |
| Close Horizons Limited | Prenton | 2013 |
| Close Invoice Finance Limited | London | 1968 |
| Close Leasing Limited | Sale | 2007 |
| Close Portfolio Management Limited | London | 1996 |
| Closeburn Limited | Stonehouse | 1964 |
| Closecooper Holdings Ltd | Darlington | 2024 |
| Closecourtt Limited | Essex | 1986 |
| Closed Bridging Finance Ltd | Worthing | 2013 |
| Closed Circle Group Limited | London | 2022 |
| Closeline Marketing Ltd | London | 2026 |
| Closer Brand Investments Limited | London | 2024 |
| Closer Work Americas Ltd | Brighton | 2025 |
| Closer World Ltd | Brighton | 2025 |
| Closerstill Exhibitions Limited | London | 2018 |
| Closerstill Group Limited | London | 2018 |
| Closerstill Limited | London | 2018 |
| Closerstill Optical Holdings Limited | London | 2021 |
| Closh Enterprises Ltd | Farnham | 2024 |
| Cloth Hall Holdings Limited | Leeds | 2020 |
| Cloth Holdings Ltd | London | 2019 |
| Clothier Holdings Limited | London | 2026 |
| Clothing Runner (Holdings) Ltd | Chesterfield | 2024 |
| Cloud & Compass Holdings Limited | London | 2022 |
| Cloud (Holdings) Limited | London | 2012 |
| Cloud 10 Accounting Group Limited | Warrington | 2024 |
| Cloud 10 Accounting Holdings Limited | Warrington | 2026 |
| Cloud 3PL Ltd | Irvine | 2024 |