| Claybridge Holdings Ltd | Cullompton | 2022 |
| Claybrook Business Park Limited | Solihull | 2026 |
| Claybrook Computing Limited | Crawley | 1976 |
| Claybyrne Limited | Haverhill | 2024 |
| Clayden Associates Limited | Buckfastleigh | 2005 |
| Clayden Financial Planning Limited | Birmingham | 2003 |
| Clayden FP Holdings Limited | Birmingham | 2014 |
| Claydon Horse Exercisers Holdings Limited | Southam | 2016 |
| Claydon Mortgage Services Limited | Ipswich | 2014 |
| Claydon Partners Limited | Milton Keynes | 2014 |
| Claydon Poultry Ltd | London | 2023 |
| Clayfield Commercial Limited | Tunbridge Wells | 2023 |
| Clayfield Create 1 Ltd | Hereford | 2023 |
| Claygate Aviation Limited | Cranbrook | 2023 |
| Claygate Trustees Limited | Nr Tonbridge | 2021 |
| Clayhall Financial Services Limited | Woodford Green | 2002 |
| Clayholes Holdings Limited | Ascot | 2025 |
| Claylane Holdings Limited | Doncaster | 2022 |
| Claymere Capital Limited | Rochdale | 2025 |
| Claymore Holdings Limited | Chinnor | 2025 |
| Claymore Security Ltd | Kilmarnock | 2025 |
| Claymore Security Services Ltd | Kilmarnock | 2021 |
| Claymore Strategic Capital Ltd | Arbroath | 2025 |
| Claymore Wealth Limited | Cardiff | 2011 |
| Clayoquot Ltd | Beaminster | 2024 |
| Claypenny Consulting Limited | York | 2016 |
| Clayson Capital Partners Limited | Poole | 2006 |
| Clayson Holdings Limited | Weymouth | 2015 |
| Claystone Holdings Ltd | London | 2026 |
| Clayton & Co. Holdings Ltd | Wallasey | 2024 |
| Clayton and Sheldon Holdings Limited | Ferndown | 2025 |
| Clayton Bidco Limited | London | 2018 |
| Clayton Finco Limited | London | 2018 |
| Clayton Holdco Limited | London | 2026 |
| Clayton Holdings & Investments Limited | Sheffield | 2021 |
| Clayton Holdings Limited | West Midlands | 2003 |
| Clayton Holdings Reading Ltd | Berkshire | 2024 |
| Clayton Holmes Naisbitt Limited | Leeds | 2006 |
| Clayton Hulme Corporate Limited | Altrincham | 2022 |
| Clayton James Wealth Ltd. | Glasgow | 2018 |
| Clayton Living Holding Limited | Manchester | 2026 |
| Clayton Loans Limited | Keston | 2018 |
| Clayton Midco Limited | London | 2018 |
| Clayton Morley Group Ltd | Rochdale | 2025 |
| Clayton Mortgage Solutions Limited | Leyland | 2017 |
| Clayton NW Group Limited | Polesworth | 2025 |
| Clayton Topco Limited | London | 2018 |
| Clayton Trading Limited | Surrey | 2022 |
| Clayton, Dubilier & Rice Limited | London | 1998 |
| Clayton-Brown Financial Ltd | Wrexham | 2025 |
| Clayton-Welch Associates Limited | London | 2018 |
| Claytonkemp Holdings Limited | Leicester | 2022 |
| CLB Capital Ltd | Rochdale | 2012 |
| CLB Financial Advisors Limited | Surrey | 2002 |
| CLB Financial Services Limited | Stockport | 2025 |
| CLB Global Group Ltd | Watford | 2009 |
| CLB Holdings Ltd | London | 2021 |
| CLB Mortgages Limited | Sutton Coldfield | 2021 |
| CLB UK Invest Limited | London | 2025 |
| CLC House Pros Limited | Wakefield | 2016 |
| CLC Investments Limited | Jarrow | 2021 |
| CLC Irish Doncaster Ltd | Rotherham | 2026 |
| CLC Wealth Limited | Glasgow | 2024 |
| Clcg Holdings Ltd | London | 2019 |
| CLD Commercial Limited | Dundee | 2025 |
| CLD Investment Group Ltd | Aberdeen | 2024 |
| CLD Prop Ltd | Much Hadham | 2025 |
| CLE Holdings Ltd | Glasgow | 2017 |
| Cleabarrow Investments Limited | Southampton | 2021 |
| Cleabarrow Limited | Southampton | 2009 |
| Cleag Group Ltd | Sheffield | 2021 |
| Cleals Holdings Limited | Poole | 2019 |
| Clean Air Holdings Limited | Wetherby | 2016 |
| Clean Air Plant Procurement Services Limited | Oswestry | 2022 |
| Clean Air Traders Ltd | Waterlooville | 2023 |
| Clean Air Ventures Limited | Liverpool | 2019 |
| Clean and Retrieve Holdings Limited | East Markham | 2021 |
| Clean Car Holdings UK Limited | Reading | 2022 |
| Clean Carbon Conversions Africa Investments PTY Ltd | London | 2026 |
| Clean Catalyst Limited | London | 2018 |
| Clean Electricity Generation Holding UK Limited | Leicester | 2016 |
| Clean Energy & Infrastructure 6 UK Limited | Warrington | 2017 |
| Clean Energy and Infrastructure 3 Limited | London | 2015 |
| Clean Energy and Infrastructure 6 UK Holdings Limited | Warrington | 2017 |
| Clean Energy and Infrastructure UK Limited | Warrington | 2013 |
| Clean Energy and Infrastructure UK Wind 2 Limited | Warrington | 2015 |
| Clean Energy and Infrastructure UK Wind Limited | Warrington | 2014 |
| Clean Energy Certificates Ltd | Leigh-On-Sea | 2025 |
| Clean Energy Investments (UK) Ltd | Devizes | 2018 |
| Clean Environment Holdings UK Ltd | Shrewsbury | 2023 |
| Clean Forestry Limited | London | 2021 |
| Clean Growth Investment Carried Interest GP II Limited | Aberdeen | 2024 |
| Clean Growth Member 1 Limited | London | 2020 |
| Clean Growth Member 2 Limited | London | 2020 |
| Clean Holdings Limited | Hertford | 2015 |
| Clean Image (Lincoln) Limited | Lincoln | 2018 |
| Clean Power Hydrogen PLC | Doncaster | 2021 |
| Clean Power UK Holdings Ltd | London | 2026 |
| Clean Power UK Solar Ltd | London | 2026 |
| Clean Seas Limited | London | 2026 |