| Clewborough Hill Residents Association Limited | Farnborough | 1988 |
| Cley Sparkles Limited | Holt | 2022 |
| CLF Packaging Limited | Huntingdon | 2026 |
| Clgm LIC Limited | Glasgow | 2013 |
| CLIC2SAVE Limited | Enfield | 2003 |
| Click 4 Accounts Limited | Welwyn Garden City | 2012 |
| Click and Jump Limited | Grimsby | 2006 |
| Click Aviation Network Ltd | Chester | 2014 |
| Click Car Parts Limited | Chesterfield | 2009 |
| Click Fragrance (UK) Limited | Watford | 2014 |
| Click Money Limited | Beckenham | 2012 |
| CLICK4PRINT.CO.UK Ltd | New Malden | 2012 |
| Clickaskip Limited | Farnham | 2015 |
| Clickhut Ltd | Manchester | 2022 |
| Clickstop Limited | | 2001 |
| Cliclift UK Ltd | Leigh-On-Sea | 2022 |
| Cliddesdon Reach Management Company Limited | High Wycombe | 2005 |
| Client Construction Company Limited(The) | Alcester | 1979 |
| Client Perspectives Limited | Berkhamsted | 2014 |
| Clients Plus Ltd | Bristol | 2020 |
| Clifdene Apartments Limited | Bangor | 1996 |
| Cliff Bridge Place Management Limited | Scarborough | 2014 |
| Cliff Investment Properties Limited | Ventnor | 1996 |
| Cliffe Lane 1966 Limited | Cleckheaton | 2014 |
| Cliffe Veterinary Group Limited | Bristol | 2020 |
| Clifford & Co.(Sidcup)Limited | Welling | 1933 |
| Clifford Chance Technology Limited | London | 2018 |
| Clifford FRY & Co Ltd | | 1999 |
| Clifford Holdings Limited | Bristol | 2025 |
| Clifford Hughes Limited | Milton Keynes | 2004 |
| Clifford Leisure Limited | London | 2019 |
| Clifford Osborne Wealth Management Ltd | Eastbourne | 2019 |
| Clifford Platt Holdings Limited | Crewe | 2024 |
| Clifford Roberts (Accountants) Limited | Moulton Park | 2007 |
| Clifford Solutions & Partnerships Limited | Ashford | 2024 |
| Clifford White Limited | Lancashire | 1972 |
| Clifford, Poole & Co Limited | Preston | 2003 |
| Cliffside Management (Canford Cliffs) Limited | Dorset | 2000 |
| Clifton Brothers Industries Limited | West Drayton | 1946 |
| Clifton Court (Royal Terrace) Limited | Southend On Sea | 1998 |
| Clifton Garage Limited | Exeter | 1999 |
| Clifton Gardens Block N Limited | London | 2024 |
| Clifton Gardens Development Management Limited | London | 2025 |
| Clifton Gardens Developments Limited | London | 2024 |
| Clifton Gardens Investments Limited | London | 2024 |
| Clifton Gate Property Management Company Limited | Belfast | 2005 |
| Clifton House (Guildford) Limited | Guildford | 2004 |
| Clifton House (Kettering) Management Limited | Kettering | 2001 |
| Clifton House Upper Avenue Limited | Eastbourne | 2004 |
| Clifton Johnson Property Ltd | Folkestone | 2023 |
| Clifton Moor Retail Park Nominee NO. 1 Limited | London | 2006 |
| Clifton Moor Retail Park Nominee NO. 2 Limited | London | 2006 |
| Clifton Road (Henlow) Management Company NO.1 Limited | Henlow | 2012 |
| Clifton Road Limited | Wilmslow | 2016 |
| Clifton Road Management Company Limited | Hove | 2001 |
| Clifton Stone Ltd | Hemel Hempstead | 2002 |
| Clifton Tea Company Limited | Avonmouth | 2026 |
| Clifton Village Developments Limited | London | 2025 |
| Clifton Village Investments Limited | London | 2025 |
| Clifton Wood House Limited | London | 2012 |
| Clifton Works Ltd | Kettering | 2020 |
| Clik Software Limited | Birmingham | 2013 |
| Climac Organization Limited | Wrexham | 2024 |
| Climaire Limited | London | 2001 |
| Climaseal UK Limited | Liverpool | 2012 |
| Climastar UK Ltd | Stoke-On-Trent | 2025 |
| Climate Cover Limited | Milton Keynes | 2011 |
| Climate Energy Group Ltd | Stoke On Trent | 2016 |
| Climate Maintenance Services Limited | Crewe | 2016 |
| Climate Peace Alliance Ltd. | Basildon | 2023 |
| Climate Tech Consulting Ltd | Oakham | 2020 |
| Climate Tech Investments Ltd | Oakham | 2020 |
| Climate Tech Ltd | Oakham | 2020 |
| Climatech Capital Ltd | London | 2025 |
| Climatech Industries Co., Ltd | Beckenham | 2011 |
| Climax Books Limited | London | 2016 |
| Climax Motorsport Limited | Chelwood Gate | 2008 |
| Climb (UK) Limited | Chippenham | 2011 |
| Climb on Bikes Limited | Bridgwater | 2011 |
| Climbers' Shop Limited(The) | Ambleside | 1979 |
| Climbing Cards Ltd | Keighley | 2025 |
| Clinic 75 Ltd | Glasgow | 2021 |
| Clinical Concept Limited | London | 2015 |
| Clinical Law Ltd | Liverpool | 2012 |
| Clinical Psychology Centre Ltd | Thetford | 2013 |
| Clinicguideng Ltd | Peterborough | 2021 |
| Clinigen Branded Products Limited | Burton On Trent | 2022 |
| Clinigen CTS Limited | Burton On Trent | 2004 |
| Clinigen Pharma Limited | Burton On Trent | 2010 |
| Cliniglow Ltd | Camberley | 2023 |
| Cliniwise Ltd | Solihull | 2025 |
| Clinixir Limited | Basingstoke | 2014 |
| Clinocall Limited | Peterborough | 2021 |
| Clinpro Ltd | Saffron Walden | 2020 |
| Clinton Devon Estates Limited | Exeter | 2011 |
| CLINTON2025 Limited | Leytonstone | 2020 |
| Clioko Limited | | 1992 |
| Clipable Limited | Stockport | 2017 |
| Clipboard Ltd | Manchester | 2023 |
| Clipity Clip Ltd | Princes Risborough | 2008 |