| Cleevemount Properties Ltd | Cheltenham | 2023 |
| Cleeves Financial Services Limited | Shoreham-By-Sea | 2018 |
| Clegg (Nameco) Limited | London | 2013 |
| Clegg Gifford & Co Limited | London | 1993 |
| Clegg's Food Service Limited | Preston | 2024 |
| Cleggacy Financial Limited | Leeds | 2023 |
| Clemens and Tanner Holdings Ltd | Guildford | 2019 |
| Clemens Brothers Holdings Limited | Southampton | 2020 |
| Clemens Holdings Limited | Wallington | 2018 |
| Clemens Kueppers Holding Ltd | Bicester | 2021 |
| Clementine Associates Limited | Maidstone | 2002 |
| Clementine Bidco Limited | London | 2026 |
| Clementine Financial Limited | Lancaster | 2013 |
| Clementine Holdco Limited | London | 2026 |
| Clementine Midco Limited | London | 2026 |
| Clements & Co Mortgage & Insurance Advisers Ltd | Liverpool | 2014 |
| Clements Europe Limited | London | 2009 |
| Clements Finance Limited | Northampton | 2008 |
| Clements Financial Ltd | Peterborough | 2018 |
| Clements Financial Planning Ltd | London | 2015 |
| Clements Financial Solutions Ltd | Ballymena | 2024 |
| Clements Young Holdings Ltd | Lincoln | 2025 |
| Clementsbury Holdings Ltd | Waltham Abbey | 2019 |
| Clemi Capital Finance Ltd | Burnham | 2010 |
| Clemi Capital Limited | Slough | 2025 |
| Clemington Holdings Ltd | Darwen | 2025 |
| Clemlion Properties Ltd | London | 2024 |
| Clemo Family Investment Company Ltd | Salisbury | 2022 |
| Clemont Ltd | London | 2020 |
| Clemworth Ltd | Bath | 2025 |
| Clemz Trading Ltd | New Milton | 2026 |
| Clemzer Company Holding Limited | London | 2023 |
| Clency Limited | Broxbourne | 2025 |
| Clendinning (Holdings) Limited | Holywood | 1960 |
| Clendinning Claim Consultants (NI) Limited | Downpatrick | 2016 |
| Clennell Holdings Ltd | Durham | 2025 |
| Clent Finance Limited | Cheltenham | 1997 |
| Clent Holdings Ltd | Bridgnorth | 2018 |
| Clent Life Holdings Ltd | Stourbridge | 2021 |
| Clenviro Holdings Ltd | Leicester | 2022 |
| Cleoanne Limited | London | 2023 |
| Cleofian Enterprises Limited | Tiverton | 2015 |
| Cleopatra Family Investment Company Ltd | St Helens | 2020 |
| Cleopatra UK Bidco Limited | Cheadle | 2019 |
| Clercomp Limited | Birmingham | 2009 |
| Clerical Medical Finance Limited | London | 1999 |
| Clerkenwell AF 1 Ltd | London | 2026 |
| Clerkenwell Capital Ltd | London. | 1983 |
| Clerkenwell Investment Group Ltd | Wigan | 2025 |
| Clerkhill Limited | London | 1977 |
| Clerking & Compliance Ltd | Stoke-On-Trent | 2026 |
| Clerksroom Holdings Limited | Taunton | 2021 |
| Clermont Mortgage Solutions Limited | Southminster | 2023 |
| Cleve Hill Solar Park Hold Co Limited | London | 2024 |
| Clevedale Consulting Limited | Dorchester | 2018 |
| Cleveden Financial Services Limited | Glasgow | 2022 |
| Cleveden Park Wealth Ltd | Glasgow | 2021 |
| Clevedon Holdings Limited | Sutton Coldfield | 2025 |
| Clevedon Software Limited | Portishead | 2021 |
| Clevedon Town Holdings Ltd | London | 2026 |
| Cleveland Bay Limited | Esher | 2016 |
| Cleveland Biotech (Holdings) Limited | Caerphilly | 2013 |
| Cleveland Cable Company (Holdings) Limited | Middlesbrough | 2012 |
| Cleveland Clinic UK Financing PLC | London | 2018 |
| Cleveland Clinic UK Holdings Ltd | London | 2015 |
| Cleveland Fire Brigade Risk Management Services C.I.C. | Preston Farm Business Park | 2011 |
| Cleveland Group Holdings Limited | London | 2026 |
| Cleveland Scott Investments Limited | Warrington | 2023 |
| Cleveland Street Engineering Limited | Manchester | 2024 |
| Cleveland UK Holding Company Limited | London | 2019 |
| Cleveland Wealth Management Ltd | Stockton-On-Tees | 2016 |
| Clever Advice Mortgages Limited | Hertford | 2018 |
| Clever Bird Holdings Limited | London | 2019 |
| Clever Brick Finance Limited | Chester | 2019 |
| Clever Commercial Finance Limited | Hereford | 2021 |
| Clever Cookie Holdings Ltd | Wisbech | 2022 |
| Clever Debt Solutions Ltd | London | 2018 |
| Clever Energy Holdings Ltd | Otley | 2019 |
| Clever Finance Ltd | Harrow | 2025 |
| Clever Financial Services Ltd | Harrow | 2014 |
| Clever Financial Solutions Limited | Hertford | 2017 |
| Clever Group Limited | Broadstairs | 2018 |
| Clever Holdings Ltd | Dunston | 2020 |
| Clever Investment Management Ltd | Chester | 2022 |
| Clever Money Limited | | 2007 |
| Clever Olive Limited | Shrewsbury | 2026 |
| Clever One Holdings Limited | Tunbridge Wells | 2024 |
| Cleverbits Holdings Limited | Slough | 2018 |
| Cleverly Advisory Services Ltd | Pinner | 2011 |
| Cleverly and Yeo-Smith Ltd | Bristol | 2023 |
| Cleverly Group Limited | Southampton | 2018 |
| Cleverly Planned Limited | Shipley | 2019 |
| Clevermatch Holdings Ltd | London | 2023 |
| Cleverpenny Investments Limited | Berkshire | 2007 |
| Clevett Holdings Limited | Bristol | 2023 |
| Clewer Crescent Limited | Birmingham | 2021 |
| Clewley Investments Limited | Bromley | 1986 |
| CLF Group Limited | Huntingdon | 2024 |
| CLG Advisors Ltd | London | 2023 |
| CLG Capital 1 UK Limited | London | 2025 |