| Clovelly Painting Group Limited | Paisley | 2025 |
| Clover & Thistle Limited | Basingstoke | 2013 |
| Clover Drive 1970 Limited | Hartlepool | 2014 |
| Clover Homecare Services Limited | Birmingham | 2013 |
| Clover House Homes Limited | Bognor Regis | 2013 |
| Clover Index Limited | Maidstone | 2013 |
| Clover Park Organics Limited | Haverfordwest | 2001 |
| Clover Refurbishment Limited | Bristol | 2004 |
| Clover Things Limited | London | 2017 |
| Cloverdale Merchants Limited | Belfast | 2003 |
| Cloverfields Farming Limited | Nantwich | 2025 |
| Cloverleaf Associates (Clacton) Limited | Ongar | 2017 |
| Clowes Developments (Mfds) Limited | Ashbourne | 2009 |
| Clowns 4 US Ltd | London | 2020 |
| CLP SW Engineering Ltd | Taunton | 2017 |
| CLR Enterprises Limited | Five Oak Green | 2013 |
| Clrt Services Ltd | Uxbridge | 2017 |
| CLS Europe Invest General Partner Asset Management Ltd | London | 2025 |
| CLS Europe Invest Ltd | London | 2016 |
| CLS UK Properties Limited | London | 2012 |
| CLT EOT Limited | Leeds | 2026 |
| Clt-Ufa UK Radio | | 1980 |
| Cluaneo Meadows Land Management Ltd | Ballyclare | 2004 |
| Cluaran Loch Lomond Ltd | Glasgow | 2016 |
| Club 7 Summits Limited | Newport | 2004 |
| Club ALP 4000 Ltd | Newport | 1992 |
| Club America Limited | Harrogate | 2012 |
| Club Australia Limited | Harrogate | 2012 |
| Club Boutique Limited | St. Asaph | 2016 |
| Club Caribbean Limited | London | 1999 |
| Club Events Limited | Bishop'S Stortford | 2025 |
| Club Gaia UK Limited | Dewsbury | 2002 |
| Club Great Britian Limited | Harrogate | 2012 |
| Club GT Events Ltd | London | 2026 |
| Club Kerala Limited | Pilton | 2014 |
| Club LA Santa Limited | Harrow | 1987 |
| Club Live Ltd | St. Albans | 2013 |
| Club Pools Limited | Axbridge | 2013 |
| Club Scandinavia Limited | Harrogate | 2012 |
| Club Spice Limited | Manchester | 2014 |
| Club World Travel Limited | Co Armagh | 1995 |
| Club World Wide Limited | Harrogate | 2012 |
| Club XS Limited | Carlisle | 1985 |
| CLUB(0%) Ltd | London | 2025 |
| Clubb Private Endeavour (UK) Limited | Abingdon | 2022 |
| Clubcast Limited | Haslemere | 2022 |
| Clubworks Golf Limited | Horsham | 2017 |
| Cludde Limited | Telford | 2011 |
| Clue Software Limited | Bristol | 2025 |
| Clumber Ltd | London | 2022 |
| Clumpy Limited | London | 2017 |
| Clutch Related Enterprises Limited | London | 2020 |
| CLW Group Ltd | Kenilworth | 2018 |
| CLW Inspection Services Ltd | North Shields | 2014 |
| Clwb Golff Aberteifi CYF | Cardigan | 2021 |
| Clwyd Capital Ltd | Abergele | 2022 |
| Clwyd Realty Ltd | Abergele | 2024 |
| Clwyd Refrigeration Limited | Conwy | 2016 |
| Clwyd Wood Products Ltd | Ruthin | 2015 |
| Clydach Group Ltd. | Ynyshir | 2017 |
| Clyde Bonding Company Limited | Glasgow | 1907 |
| Clyde Castle Limited | Ayr | 2020 |
| Clyde Cooperage Company Limited | Glasgow | 1884 |
| Clyde Cruise Ships Limited | Ayr | 2020 |
| Clyde Daniel Marcus Walker Limited | Leeds | 2025 |
| Clyde Heat Network Limited | Manchester | 2023 |
| Clyde House Management Company Limited | Redditch | 1996 |
| Clyde Presentation Packaging Ltd | Glasgow | 2026 |
| Clyde Pumps Limited | Sheffield | 1955 |
| Clyde Sturtevant Limited | Doncaster | 1899 |
| Clyde Valley Cleaning Ltd | Glasgow | 2011 |
| Clyde VET Group Ltd | Edinburgh | 2016 |
| Clyde Walker Limited | Leeds | 2025 |
| Clyde Yacht Charters Limited | Newbridge | 2021 |
| Clydeforth Construction Limited | Glasgow | 2010 |
| Clydemanor Properties Ltd | Lancashire | 2000 |
| Clydemore Properties Limited | | 1996 |
| Clydesdale Roofing Supplies (Leyland) Limited | Sheffield | 1981 |
| Clydesdale Scotch Whisky Company Ltd. | Glasgow | 2007 |
| Clydeside Ceramics Ltd | Greenock | 2025 |
| Clydeside Homes Limited | Glasgow | 1972 |
| Clydeside Investment Properties Limited | Lanarkshire | 2000 |
| Clyhurst Properties Limited | Winchester | 1973 |
| Clymad Limited | Glasgow | 2002 |
| CM Bryant and SON Limited | Bristol | 2014 |
| CM Connect Ltd | Armagh | 2025 |
| CM Group (West Sussex) Limited | Cardiff | 2018 |
| CM Media & Research Ltd | Manchester | 2023 |
| CM Reinforcement Ltd | Nottingham | 2016 |
| CM Savage Ltd | Edinburgh | 2012 |
| CM Stan Consulting Ltd | Carlisle | 2022 |
| CM Technology Global Ltd | Mildenhall | 2025 |
| CM2 Industrial Services Ltd | Brentwood | 2016 |
| CMA Financial Temps Limited | Southampton | 1997 |
| CMA Moldform Group Limited | Birmingham | 2015 |
| Cmac Wood Machinery Ltd | Trowbridge | 2024 |
| CMB23 Limited | Huddersfield | 2023 |
| Cmbta Limited | Shotts | 2012 |
| CMC Decorators Limited | Glasgow | 2014 |
| CMC Group Ltd | Liverpool | 2016 |