| Consolidated Communications Limited | London | 1993 |
| Consolidated Rentals Limited | Droitwich | 2015 |
| Consolidated Services Group Limited | Essex | 2009 |
| Conson International Limited | London | 2009 |
| Consort Homes Limited | Leeds | 2014 |
| Consort Property Holdings Limited | London | 2007 |
| Consort Property Management Limited | London | 1997 |
| Consortium Collaborate Ltd | Cottingham | 2021 |
| Consortium Connect Ltd | Cottingham | 2021 |
| Consortium Executive Selection Ltd | Cottingham | 2021 |
| Consovenio, Ltd. | London | 2016 |
| Conspiracy Ltd | Isle Of Lewis | 2015 |
| Consta Capital Limited | London | 2025 |
| Constable Aviation Limited | London | 2010 |
| Constable Garth Limited | North Shields | 2005 |
| Constant Floors Limited | Walsall | 2022 |
| Constantia Care Developments Limited | Batley | 2014 |
| Constantia Care Homes Limited | Batley | 2014 |
| Constantin Sorin Giuglea Ltd | City Of London | 2024 |
| Constantine Bay Homes NO1 Management Company Limited | London | 2025 |
| Constantine Plant Company Limited | Letchworth Garden City | 1952 |
| Constellation Cold Logistics UK 2 Limited | N E Lincolnshire | 1955 |
| Constellation Financial Services Limited | Darlington | 2015 |
| Constru-I Ltd | Stockton On Tees | 2019 |
| Construction & Development (UK) Ltd | West Midlands | 2009 |
| Construction Business Ltd | Camberley | 2012 |
| Construction Consultancy Limited | Cricklade, Swindon | 2003 |
| Construction Driani Ltd | Dover | 2017 |
| Construction Fastener Techniques Limited | Banbury | 1985 |
| Construction Hire Solutions Limited | London | 2021 |
| Construction Plant (Suppliers) Limited | Carlisle | 1990 |
| Construction Risk Solutions Ltd | Manchester | 2021 |
| Construction Sealants (North-West) Limited | Upminster | 2008 |
| Construction Sealants (Southern) Limited | Upminster | 2008 |
| Construction Services Holdings Ltd | Stone | 2026 |
| Construction Supplies (Adlington) Limited | Bolton | 1979 |
| Construction Tax & Finance Limited | Evesham | 2025 |
| Construction Training Solutions Limited | Doncaster | 2009 |
| Construction Workers Limited | Middlesex | 2004 |
| Construction-Tourism-Trading Ltd | London | 2011 |
| Constructive Conservation Limited | Haywards Heath | 2008 |
| Constructive Films Ltd | Chelmsford | 2024 |
| Consult Health Ltd | London | 2011 |
| Consult Invest Trade Limited | London | 2013 |
| Consult NT Ltd | Cambridge | 2019 |
| Consultancies Limited | Tattenhall | 2005 |
| Consultancy Empire Ltd | Rochdale | 2011 |
| Consultancy UN Limited | Swansea | 2014 |
| Consultant Development Engineering Limited | Forster Street Leeds | 2004 |
| Consultant Nominees Limited | Salford | 2006 |
| Consulting for Future Ltd | London | 2025 |
| Consulting for Quality Ltd | London | 2022 |
| Consulting Ltd | London | 2002 |
| Consultmyapp Limited | Manchester | 2018 |
| Consumer Assist Ltd | Warrington | 2012 |
| Consumer Buyers (Finance) Limited | Shepton Mallet | 1973 |
| Consumer Choice Financial Services Limited | Dalkeith | 2020 |
| Consumer Lifestyles Limited | Ross-On-Wye | 2009 |
| Contact Centre Management Association Limited | Godalming | 2020 |
| Contact ED Limited | Widnes | 2018 |
| Contact Electrical and Mechanical Services Ltd | Norwich | 2013 |
| Contact Lens Medica Ltd | London | 2019 |
| Contact Plant Limited | Buckingham | 2018 |
| Contact Sourcing Limited | Birmingham | 2010 |
| Contacts Limited | Pitstone | 1986 |
| Contadina Limited | Liverpool | 2012 |
| Contador Lopez Limited | Folkestone | 2024 |
| Contagious Publishing Limited | Edinburgh | 2007 |
| Contain-A-Lock Limited | Walsall | 2005 |
| Container Hub Ltd | Glasgow | 2022 |
| Container Restoration Ltd. | Birmingham | 1996 |
| Container Sales (Scotland) Ltd | Cumbernauld | 2008 |
| Container Sales South Wales Ltd | Bridgend | 2020 |
| Containerlift Sales Limited | Great Dunmow | 1997 |
| Containers for Girls Limited | Dudley | 2013 |
| Containers Online Ltd | Walsall | 2016 |
| Containerwise Limited | Doncaster | 2023 |
| Contamaway Limited | Ashford | 2002 |
| Contango Investments Limited | Brixham | 2014 |
| Contanti Limited | Weymouth | 2006 |
| Contech Building Supplies (UK) Ltd | Craigavon | 2013 |
| Contego Solutions Limited | Cardiff | 2018 |
| Contelec Limited | Stone | 1994 |
| Contemi Consulting Limited | Shrewsbury Business Park | 2001 |
| Contemporary Rites Limited | Hove | 2003 |
| Contemporary Spaces Online Limited | Colchester | 2016 |
| Contener Limited | Manchester | 2015 |
| Content Shack Ltd | Cannock | 2022 |
| Contentbible Limited | Manchester | 2015 |
| Contessa Dolls Limited | Cardiff | 2021 |
| Contessa Hotels Limited | Wallasey | 2008 |
| Contesse Floors UK Limited | Walsall | 2022 |
| Contin Co., Ltd | Beckenham | 2014 |
| Continental Chef Supplies Limited | London | 1997 |
| Continental Computers Limited | Cheltenham | 1996 |
| Continental Deliveries Direct Limited | Fobbing | 2006 |
| Continental Eyewear Limited | Liverpool | 1984 |
| Continental Fine Foods Limited | Hessle | 1987 |
| Continental House Limited | London | 2012 |
| Continental International Trading Limited | Manchester | 2026 |