| Corvara Consulting Limited | Other services | 2015 |
| Corvyx Ltd | Information & communication | 2013 |
| Cosaint Global Limited | Administrative & support | 2023 |
| Cosmopolite Group Ltd | Professional & scientific | 2026 |
| Cossar Limited | Transport & logistics | 2023 |
| Costi Luxury Building Construct Ltd | Construction | 2026 |
| Cosy Corner Properties Ltd | Real estate | 2024 |
| Cosy Countryside Cottages Limited | Real estate | 2025 |
| Cotswold House Management Guildford Ltd | Households | 2025 |
| Cottingwood Lane Ltd | Construction | 2022 |
| Cottonconnect Limited | Professional & scientific | 2009 |
| Cottonconnect Nominees Limited | Professional & scientific | 2015 |
| Cottonconnect Trustees Limited | Other services | 2022 |
| Countedin Ltd | Professional & scientific | 2025 |
| Country Field House Ltd | Hospitality | 2010 |
| Countrywide Delivery Limited | Transport & logistics | 2019 |
| Countrywide Vapes Ltd | Other services | 2015 |
| Countx Ltd | Information & communication | 2026 |
| County Cabs Limited | Transport & logistics | 2022 |
| County Care Independent Living Holding Limited | Financial services | 2025 |
| County Care Independent Living Ltd | Health & social care | 2010 |
| Courier Network Limited | Administrative & support | 1998 |
| Courthope Property Management Limited | Real estate | 1990 |
| Courtwood Freehold Limited | Households | 1986 |
| Courtwood Management Limited | Households | 1967 |
| Coussens Limited | Professional & scientific | 2014 |
| Covercoaches Limited | Arts & recreation | 2011 |
| COW PIE Ltd. | Information & communication | 2020 |
| Cowboy After Dark Ltd | Professional & scientific | 2026 |
| Cowlard & Co Ltd | Real estate | 2016 |
| CPH Express Ltd | Transport & logistics | 2024 |
| Cppi Bridgewater Place General Partner Limited | Professional & scientific | 2003 |
| Cppi Bridgewater Place Limited Partnership | | 2003 |
| Cppi Bridgewater Place Nominee Limited | Extraterritorial | 2014 |
| CR Aesthetics Ltd | Health & social care | 2024 |
| Crackerjack Creative Ltd | Professional & scientific | 2019 |
| Crafford & Co Ltd | Professional & scientific | 2025 |
| Craft Mediaworks Ltd | Information & communication | 2024 |
| Crafted Education Ltd | Education | 2026 |
| Craftmyzzi Ltd | Wholesale & retail | 2025 |
| Craig Powell Plumbing and Heating Ltd | Construction | 2012 |
| Crammonds Limited | Transport & logistics | 1998 |
| Cranbourne Actuarial Limited | Professional & scientific | 2015 |
| Crane Cardiac Diagnostics Ltd | Health & social care | 2022 |
| Cranes Park Management Company Limited | Households | 2016 |
| Cranford Capital Management Limited | Professional & scientific | 2015 |
| Cranleigh Dance and Theatre Arts Ltd | Education | 2014 |
| Cranley Court Residents Association Limited | Households | 2005 |
| Craved Care Limited | Health & social care | 2019 |
| CRC Repairs Limited | Information & communication | 2013 |
| Cream Advisory Services Limited | Professional & scientific | 2021 |
| Cream Interior Design Limited | Professional & scientific | 2011 |
| Createlondon Media Limited | Professional & scientific | 2014 |
| Creative Focus International Ltd | Professional & scientific | 2019 |
| Creative Machine Limited(The) | | 1978 |
| Creative Wood Trade Ltd | Wholesale & retail | 2022 |
| Credence Sports International Limited | Arts & recreation | 2025 |
| Credenda Limited | Financial services | 1986 |
| Credit Management Professionals Ltd | Administrative & support | 2011 |
| Crescent Care Limited | Health & social care | 1995 |
| Crescent Drive Property Management Ltd | Real estate | 2023 |
| Crestglen Property Company Limited | Real estate | 2002 |
| Crev Carpentry Ltd | Manufacturing | 2022 |
| Cribbhq Ltd | Professional & scientific | 2020 |
| Criss Transs Ltd Ltd | Manufacturing | 2023 |
| CRISTAL-CLEAN4YOU Ltd | Transport & logistics | 2020 |
| Critchell Construction Ltd | Construction | 2026 |
| Critical Divide Limited | Information & communication | 2005 |
| Critical Selection Limited | Administrative & support | 2005 |
| Crofton Orofacial Health Surgery Ltd | Health & social care | 2019 |
| Cropredy Bridge Cars Limited | Wholesale & retail | 2010 |
| Crosshill Music Limited | Information & communication | 2006 |
| Crosslands Housing Limited | Real estate | 2019 |
| Crosswell Services Limited | Manufacturing | 1996 |
| Crouch Holdings Ltd | Professional & scientific | 2025 |
| Crowdhill Limited | Real estate | 1993 |
| Crown Alterations Limited | Wholesale & retail | 2015 |
| Crownwood Developments Limited | Construction | 2000 |
| Croxted Holdings Limited | Households | 2026 |
| Cryostar Limited | Extraterritorial | 1954 |
| Crypto Football League LLP | | 2025 |
| Crystal Cloud Co (UK) Ltd | Wholesale & retail | 2015 |
| Crystal Interactive Ltd | Professional & scientific | 2000 |
| Crystal Palace Park Management Company Limited | Households | 2012 |
| Crystal Palace Parkview Limited | Households | 2006 |
| CS Autos (Surrey) Limited | Wholesale & retail | 2021 |
| CS Driving Solution Ltd | Transport & logistics | 2020 |
| CS UK Storage LLP | | 2025 |
| CSD Accountancy Solutions Ltd | Professional & scientific | 2021 |
| CSD Bookkeeping Solutions Ltd | Professional & scientific | 2026 |
| Csense Financial Services Ltd | Real estate | 2014 |
| Csense Investments Ltd | Real estate | 2021 |
| Csense Properties LLP | | 2015 |
| CSR Haulage Ltd | Transport & logistics | 2024 |
| CSR Services Ltd | Wholesale & retail | 2015 |
| CT Design Studio Ltd | Professional & scientific | 2026 |
| CT Expedition Ltd | Transport & logistics | 2021 |
| CT Freight Limited | Transport & logistics | 2013 |
| CTG Data Ltd | Wholesale & retail | 2021 |
| CTM Energy Ltd | Mining & quarrying | 2026 |