| Clearing Spaces Interiors Ltd | Luton | 2026 |
| Clearjunk SW Ltd | Plymouth | 2020 |
| Clearly Accounted Limited | Stafford | 2024 |
| Clearly Better Designs Ltd | Sleaford | 2025 |
| Clearly Vizable Ltd | Burgess Hill | 2013 |
| Clearmark Limited | London | 2020 |
| Clearpath Technologies Ltd | Doncaster | 2026 |
| Clearroute for Services Limited | Manchester | 2026 |
| Clearslate Debt Solutions Ltd | Dungannon | 2021 |
| Clearsmile Aligners Limited | Tamworth | 2013 |
| Clearstone Property Holdings Ltd | Doncaster | 2026 |
| Clearstone Ventures Ltd | Doncaster | 2026 |
| Clearstream Nominees Limited | London | 1988 |
| Cleartone Finance Services Limited | Bristol | 2009 |
| Cleartone Forensic Data Services Limited | Winterbourne | 2015 |
| Cleartone Solutions Limited | Bristol | 2009 |
| Cleartone Telecomms Limited | Bristol | 2009 |
| Cleartone Telecommunications Limited | Winterbourne | 2009 |
| Cleartone UK Limited | Bristol | 2009 |
| Cleartrans Limited | Durham | 2014 |
| Clearview Media Ltd | Chelmsford | 2014 |
| Clearview Psychology Ltd | Telford | 2021 |
| Clearwater (Capernwray) Management Company Limited | Huddersfield | 2009 |
| Clearwater (Oxford) Limited | Oxford | 1999 |
| Clearwater Heating Supplies Ltd | Bristol | 2018 |
| Clearwater Management Limited | Wirral | 2004 |
| Clearwater Shipping Line Ltd | Leeds | 2015 |
| Clearwater Tracking Limited | Poole | 2018 |
| Clearway Products Ltd | Doncaster | 2025 |
| Clearways International Limited | Crawley | 2024 |
| Clearwell Quarries Limited | Derby | 1959 |
| Clearwise Limited | Lytham St.Annes | 2023 |
| Cleave Houses Treatment Plant Limited | Bideford | 2002 |
| Cleaver Court Limited | Belfast | 1987 |
| Cleaver Fulton Rankin Trustees Limited | Belfast | 2012 |
| Cleaver Holdings Limited | Stratford-Upon-Avon | 2017 |
| Cleavers Fine Foods Ltd | Whitland | 2019 |
| Cleddau Country Escapes Ltd | Bolton | 2021 |
| Cleenly Limited | Pontefract | 2018 |
| Cleethorpes Estates NO.2 Ltd | Salford | 2015 |
| Cleeve Court Limited | London | 1982 |
| Clegg Computing Systems Limited | Bude | 1986 |
| Clegg Humphreys Limited | Sutton Coldfield | 1975 |
| Clegg Special Projects Limited | Nottingham | 1997 |
| Cleghorn Wilton & Associates Limited | Bury St Edmunds | 1996 |
| Cleland 71 Limited | Glasgow | 2014 |
| Clemar Corp Ltd | London | 2023 |
| Clemens Frenshaw Limited | Wetherby | 2012 |
| Clement Commodities UK Ltd | Preston | 2022 |
| Clement Evans Properties Limited | Liverpool | 1964 |
| Clement Painting and Decorating Limited | Denny | 2022 |
| Clementine Social Media Ltd | Wakefield | 2019 |
| Clements Coffee Company Ltd - the | | 2003 |
| Clements Marine Limited | Bedford | 2012 |
| Clements Way Management Company Limited | Bristol | 2021 |
| Clemtree Limited | Uxbridge | 2005 |
| Clenham Limited | East Yorkshire | 1976 |
| Clenmay Maintenance Services Limited | Fareham | 1989 |
| Clenston Trustees NO 1 Limited | Dorchester | 2020 |
| Clenston Trustees NO 2 Limited | Dorchester | 2020 |
| Clent Hills Veterinary Group Limited | Bristol | 2010 |
| Clentec Limited | Darlington | 2020 |
| Cleo Holdings Ltd | Bexhill On Sea | 2024 |
| Cleo Wealleans-Watts Limited | Cramlington | 2022 |
| Cleomack (One) Limited | Kettering | 1988 |
| Cleomack (Three) Limited | Kettering | 1962 |
| Cleomack Limited | Kettering | 1959 |
| Cleopatra International Limited | Brighton | 2002 |
| Cler Services Limited | Antrim | 2010 |
| Cleric Limited | Hastings | 2004 |
| Clerical Code Limited | Faringdon | 2023 |
| Clerkenwell EC1 Limited | Oxford | 2007 |
| Clerkenwell Road Limited | Oxford | 2007 |
| Clerkenwell Securities Limited | London | 2014 |
| Clermont Court Brighton Limited | Haywards Heath | 2005 |
| Clesign International Holdings Ltd | Kington | 2019 |
| Clevedon 1963 Limited | Clevedon | 2014 |
| Clevedon Confectionery (Blackpool) Limited | New Mills High Peak | 1963 |
| Clevedon Investment Limited | Addlestone | 1948 |
| Cleveland 1960 Limited | London | 2014 |
| Cleveland 1963 Limited | Stockton-On-Tees | 2013 |
| Cleveland Body & Paint Limited | | 2005 |
| Cleveland Cable Company (East) Limited | Middlesbrough | 2018 |
| Cleveland Cable Company (North) Limited | Middlesbrough | 2018 |
| Cleveland Cable Company (Scotland) Limited | Glasgow | 2018 |
| Cleveland Cable Company (West) Limited | Middlesbrough | 2018 |
| Cleveland Land Services (Group) Limited | Guisborough | 2024 |
| Cleveland Metals Limited | Warrington | 1959 |
| Cleveland Tankers Limited | Birmingham | 1931 |
| Cleveland Windows and Doors Limited | Middlesbrough | 2014 |
| Clever Music Limited | Leatherhead | 1978 |
| Clever Product Innovation Ltd | Huntingdon | 2021 |
| Cleverbi Ltd | London | 2020 |
| Cleverdons Limited | Broadstairs | 2023 |
| Cleverguard Technology Co., Limited | London | 2021 |
| Cleverkit.Com Limited | Epsom | 2013 |
| Cleverpack Limited | Alfreton | 2006 |
| Cleverstein Ltd | Wigan | 2018 |
| Clevertronics Limited | Poole | 2014 |
| Clew Bay Consulting Limited | Northampton | 2023 |