| Clearview South East Ltd | Sittingbourne | 2026 |
| Clearview Sunroofs Ltd | Wolverhampton | 2017 |
| Clearview Ultrasound Service Limited | Rochford | 2024 |
| Clearvision Shutters Ltd | Cobham | 2024 |
| Clearvisor Limited | London | 2025 |
| Clearwater (Europe) Limited | Isle Of Wight. | 1992 |
| Clearwater Brewery Ltd | Bideford | 2009 |
| Clearwater Hydroacoustics Limited | Brasted | 2025 |
| Clearwater Hygiene Ltd | Glasgow | 2020 |
| Clearwater MS Ltd | Belper | 2015 |
| Clearwater Sensors Ltd | Southampton | 2019 |
| Clearwater Technologies Ltd. | Leamington Spa | 1997 |
| Clearway Doors and Windows Ltd | Gloucester | 1983 |
| Clearway Optical Services Limited | Blackpool | 2004 |
| Clearway Partners Ltd | London | 2023 |
| Clearway Sales and Promotions Ltd | Banbury | 2004 |
| Clearxskin Ltd | London | 2025 |
| Cleary and Hall Limited | Barnet | 2011 |
| Cleary. TV Ltd. | Croydon | 2019 |
| Clearzone Technologies Ltd | Wakefield | 2026 |
| Cleasby Engine Services (Motor Factors) Ltd | Central Park | 2017 |
| Cleator Moor Upholstery Services Limited | Cleator Moor | 2018 |
| Cleave & Company Limited | London | 2001 |
| Cleaver and Steel Limited | Carrickfergus | 2017 |
| Cleaver Baye Soap Company Ltd | Croydon | 2025 |
| Cleaver Properties Limited | London | 2010 |
| Cleavex Ltd | London | 2023 |
| Clecktech Solutions Limited | Cleckheaton | 2010 |
| Cleddau Brewing Co. Ltd | Haverfordwest | 2025 |
| Cleddau Press Limited | Pembrokeshire | 2003 |
| Cledop UK Limited | North Walsham | 2007 |
| Cledwyn Saunders & SON Limited | Aberdare | 1977 |
| Clee Group Ltd | Knowlhill | 2020 |
| Cleekers Ltd | Newcastle Upon Tyne | 2025 |
| Cleenol Group Limited | Banbury | 1959 |
| Cleens Sneakers Ltd | Huddersfield | 2021 |
| Cleentek Limited | Prenton | 2006 |
| Cleenzen Living Limited | West Midlands, England | 2026 |
| Cleeo Ltd | Stockport | 2026 |
| Cleethorpes Kitchen Centre Limited | Cleethorpes | 1997 |
| Cleethorpesbaked Ltd | Cleethorpes | 2026 |
| Cleeve Business Machines Limited | Lichfield | 2002 |
| Cleeve Carpentry and Build Limited | Bristol | 2023 |
| Cleeve Maintenance Services Ltd | Cheltenham | 2020 |
| Cleeve Picture Framing Limited | Cheltenham | 2014 |
| Cleeves Bespoke Woodworks Limited | Hengoed | 2025 |
| Clef Innovation Limited | London | 2015 |
| Cleft Wood Company Ltd | Buckingham | 2012 |
| Cleftbridge Limited | Saffron Walden | 1984 |
| Clegg Commercial Services Ltd | Southport | 2023 |
| Clegg Wools Limited | Sheepridge | 1982 |
| Cleghorn Lighting Ltd | Arundel | 2006 |
| Clegplan Building Limited | Brackley | 1977 |
| Clemas & Co. Limited | Tewkesbury | 1987 |
| Cleme Brut Ltd | London | 2025 |
| Clemelectrical Limited | Nottingham | 2019 |
| Clemence Watches Limited | Edinburgh | 2021 |
| Clemency Rittner Soft Furnishings Limited | Swindon | 2000 |
| Clement and Claude Limited | London | 2018 |
| Clement Carpentry Limited | Highbridge | 2017 |
| Clement Clarke International Limited | Mountain Ash | 1942 |
| Clement Pianos Limited | Nottingham | 2007 |
| Clement Windows Group Limited | Haslemere | 2016 |
| Clement Windows Limited | Haslemere | 2009 |
| Clement Windows Projects Limited | Haslemere | 2009 |
| Clementine Collective Ltd | Berkhamsted | 2023 |
| Clementine Cusack Films Ltd | Blandford Forum | 2021 |
| Clementine EST Dogs Limited | London | 2013 |
| Clements & Morris Property Group Ltd | Devizes | 2026 |
| Clements & Myles Limited | Thames Ditton | 2007 |
| Clements and Street Limited | Bromsgrove | 2005 |
| Clements Engineering (ST. Neots) Limited | Bedford | 1981 |
| Clements Engineering Ltd | Winchester | 2024 |
| Clements Limited | Derby | 1993 |
| Clements Precision Engineering Limited | Pevensey Bay | 2016 |
| Clementskitchen Ltd | London | 2022 |
| Clemessy UK Limited | London | 2011 |
| Clemson Technologies Ltd | Bolton | 2024 |
| Clenaware Systems Limited | Wellingborough | 2009 |
| Clenn Engineering Limited | Sutton Coldfield | 2013 |
| Clennell Custom Brass Limited | Birmingham | 2019 |
| Clennell Plant Repairs Limited | Richmond | 2007 |
| Clent Life Science Limited | Stourbridge | 2009 |
| Clentec Service Limited | Newcastle Upon Tyne | 2009 |
| Clenviro Ltd | Leicester | 2004 |
| Clenzora Ltd | Leicester | 2026 |
| Cleo Luana Ltd | London | 2022 |
| Cleo's Kitchen Ltd | Shipston-On-Stour | 2019 |
| Cleone Foods Limited | Birmingham | 1988 |
| Cleopamper Ltd | York | 2020 |
| Cleos Cloths Ltd | Brentford | 2024 |
| Clere Group Limited | Newbury | 1983 |
| Cleriheli Ltd | Cambridge | 2023 |
| Clerk Fencing Limited | Newry | 2002 |
| Clermon ET Associes Limited | Beckenham | 2025 |
| Clesse (UK) Limited | Pershore | 2002 |
| Cleta Petunia Studio Ltd | Hoddesdon | 2023 |
| Clevedon Brewery Limited | Clevedon | 2016 |
| Clevedon Fasteners Limited | Sutton Coldfield | 1999 |
| Clevedon Kombucha Ltd | Clevedon | 2025 |