| Cloverleaf Mortgages Limited | Leeds | 2004 |
| Cloverleys Limited | Gerrards Cross | 2007 |
| Clovernet Investments Ltd | Leeds | 2022 |
| Cloverwest Group Limited | Southampton | 2026 |
| Cloverwest Investments Limited | Southampton | 2026 |
| Clovisera Ltd | London | 2023 |
| Clowdy Group Limited | London | 2013 |
| Clowes Wealth Management Limited | Thorpe Park | 2018 |
| Clowsley Industries Ltd. | Towcester | 2016 |
| CLP Financial Ltd | Coatbridge | 2026 |
| CLP Financial Solutions Ltd | Hoddesdon | 2024 |
| CLP Life Ltd | Bedford | 2023 |
| CLP Mortgages Limited | Porstmouth | 2014 |
| CLP Safety & Training Limited | Bridgwater | 2009 |
| Clplw Holdings Ltd | Barnsley | 2023 |
| Clpr Limited | Belfast | 2022 |
| Clrhs UK Ltd | London | 2018 |
| Clrs Investment Ltd | Harrow | 2017 |
| CLS Brands Limited | London | 2021 |
| CLS Corporate 1 Limited | Waterlooville | 2025 |
| CLS Corporate 2 Limited | Waterlooville | 2025 |
| CLS Finance Limited | London | 2004 |
| CLS Financial Limited | Milton Keynes | 2021 |
| CLS Holdings UK Limited | London | 2000 |
| CLS Investments and Developments Limited | Romsey | 2025 |
| CLS Money Limited | Rayleigh | 2011 |
| CLS One Limited | London | 1998 |
| CLS Partners Limited | Barnet | 2023 |
| CLS Processing Solutions Ltd. | London | 2018 |
| CLS86 Holdings Ltd | London | 2025 |
| Clsa (UK) | London | 1971 |
| Clsj Holdings Limited | Widnes | 2026 |
| CLT Holdings Ltd | Baldock | 2025 |
| CLT Limited | Ashby-De-La-Zouch | 2022 |
| Cluaran Capital Limited | London | 2025 |
| Club 2 Thrive Ltd | Blackburn | 2026 |
| Club 28 Ventures Ltd | London | 2020 |
| Club Aixo Ltd | Cardiff | 2025 |
| Club Amusements Holdings Limited | Whitley Bay | 2018 |
| Club Champion Buyco Limited | Basingstoke | 2022 |
| Club Class Insurance Services Limited | Brighton | 2003 |
| Club Company (Group) Limited | Reading | 2015 |
| Club CUP Limited | Leeds | 2025 |
| Club Holdings Limited | Manchester | 2025 |
| Club Insure Limited | Leeds | 1998 |
| Club LA Costa Limited | London | 2015 |
| Club Lane Ltd | Glasgow | 2025 |
| Club LOS Claveles Trustee Company Limited | Lytham St. Annes | 2023 |
| Club Marketing Group Limited | Belfast | 2022 |
| Club Opulent Ltd | Peterborough | 2024 |
| Club Pebble Ltd | Ossett | 2023 |
| Club Pickle Holdings Limited | London | 2023 |
| Club Working Ltd | London | 2019 |
| CLUB28CAPITAL Limited | Brentwood | 2023 |
| Clubb Capital Limited | London | 1992 |
| Clubb Holding Limited | Fareham | 2017 |
| Clubbie Holdings Ltd | Rugby | 2020 |
| Clubcutie Limited | Chandlers Ford | 2001 |
| Clubgreen Holdings Limited | Woking | 2016 |
| Clubhouse Holdings Newcastle Limited | Newcastle Upon Tyne | 2025 |
| Clubhouse Investments Ltd | London | 2023 |
| Clubhouse Mobile Mini Golf Global Ltd | Brighton | 2022 |
| Clubhouse Studios Holding Ltd | London | 2025 |
| Clubhouse Wines Ltd | Ashford | 2026 |
| Clubhouse-Assets Ltd | Bolton | 2025 |
| Clubman Limited | Glasgow | 2021 |
| Clubw Tech UK Ltd | Ruislip, | 2026 |
| Cluck and Crusts Holdings Ltd | London | 2026 |
| Cluckie and Paterson Insurance Brokers Ltd | Carnoustie | 2019 |
| Clucky Wings Holdings Ltd | Enfield | 2026 |
| Clue Crowd Limited | Exeter | 2023 |
| Cluedo Bidco Limited | London | 2024 |
| Clues Ltd | Manchester | 2022 |
| Cluff Africa Limited | London | 2022 |
| Clugston Holdings Limited | Gainsborough | 2024 |
| Clumber Consultancy Pension Trustees Limited | Mansfield | 2016 |
| Clumberstone International Ltd | Exmouth | 2026 |
| Clumberstone Limited | Exeter | 2016 |
| Clun Limited | Ludlow | 2025 |
| Clun Valley Holdings Limited | Craven Arms | 2019 |
| Cluny Capital Limited | Bath | 2010 |
| Cluny Hill Capital Limited | London | 2013 |
| Cluny Hill Management Limited | London | 2020 |
| Clusternanotech Ltd | London | 2012 |
| Clustr Holdings Ltd | Norwich | 2022 |
| Clusura Limited | Portsmouth | 2020 |
| Clutch Property Limited | Kings Langley | 2023 |
| Clutsch Limited | Edgware | 2015 |
| Clutterbuck & Lewis Ltd | East Brent | 1990 |
| Clutton Holdings and Investments Ltd | Dudley | 2021 |
| CLV Finance UK Limited | Manchester | 2009 |
| CLV Mortgages Lincoln Limited | Lincoln | 2017 |
| Clvr Limited | Hartpury | 2005 |
| CLW Partners Limited | London | 2025 |
| CLX Gulch Limited | London | 2024 |
| Clya Ltd | London | 2024 |
| Clyd Mewn Natur Limited | Scarborough | 2024 |
| Clydach (Motors) Limited | Swansea | 1959 |
| Clyde & Yorke | Coventry | 2026 |
| Clyde Bergemann Pension (Trustees) Limited | Glasgow | 2001 |