| Capri Fast Food Ltd | Manufacturing | 2017 |
| Caprillo Ltd | Wholesale & retail | 1999 |
| Capron Steels Limited | | 1968 |
| Capus (U.K.) Limited | Wholesale & retail | 1982 |
| Car Spares & Accessories Limited | Wholesale & retail | 2004 |
| Car Tech (Service Centre) Limited | Wholesale & retail | 1997 |
| Caramel Bubble Limited | Wholesale & retail | 2023 |
| Care ALL Round Ltd | Health & social care | 2021 |
| Care Services Solihull Limited | Extraterritorial | 2002 |
| Careersat Limited | Professional & scientific | 2013 |
| Carera Windows Ltd | Construction | 1999 |
| Cares Trade Ltd | Wholesale & retail | 2023 |
| Carillion Plant & Transport Limited | Professional & scientific | 1978 |
| Carjan Properties Limited | Real estate | 1994 |
| Carl Dean Associates Limited | Construction | 2007 |
| Carl Reynolds Property Academy Ltd | Real estate | 2022 |
| Carl's Fish & Chip Shop Limited | Wholesale & retail | 2006 |
| Carpet Centre Limited | Wholesale & retail | 2007 |
| Carpet Elite Limited | Wholesale & retail | 2000 |
| Carpets Direct 2U Ltd | Wholesale & retail | 2006 |
| Cart Stream Limited | Wholesale & retail | 2026 |
| Cartencia Design Solutions Ltd | Professional & scientific | 2006 |
| Carters Green DIY Limited | Wholesale & retail | 2004 |
| Casey Estates Limited | Real estate | 2005 |
| Castell Management Limited | Professional & scientific | 2001 |
| Castings Public Limited Company | Manufacturing | 1907 |
| Castings UK Limited | Professional & scientific | 2000 |
| Castle Chrome Plating Limited | Manufacturing | 2006 |
| Castle Meat Limited | Wholesale & retail | 2003 |
| Castle Nursery Limited | Health & social care | 2002 |
| Castle Prints Limited | Wholesale & retail | 2000 |
| Castle View Dental Practice Limited | Health & social care | 2006 |
| Castlecroft Homes Limited | Construction | 2000 |
| Caurane Limited | Real estate | 2004 |
| Cavan Fertility Limited | Professional & scientific | 2020 |
| Cavan Vets Ltd | Professional & scientific | 2018 |
| Cavanna Electric Co., Ltd | Manufacturing | 2023 |
| CC Autocentres Limited | Wholesale & retail | 1996 |
| Ccalmis Ltd | Construction | 2023 |
| CCW Building & Roofing Contractors Limited | Construction | 2003 |
| Cedargrove Gates Limited | Households | 2005 |
| Central Commercials Coventry Ltd | Wholesale & retail | 2000 |
| Central Installations Limited | Construction | 2003 |
| Central IT Systems Limited | Other services | 2007 |
| Central Leisure (Stamford) Limited | Hospitality | 1994 |
| Central Motors (LYE) Limited | Administrative & support | 2006 |
| Central Plate Services Holdings Limited | Other services | 2017 |
| Central Plate Services Limited | Manufacturing | 1983 |
| Centrifuge Galvanizing Limited | Extraterritorial | 1981 |
| Centro Scaffolding Limited | Construction | 2003 |
| Century Inns Limited | Extraterritorial | 1991 |
| Ceol Community CIC | Arts & recreation | 2026 |
| Cephas Limited | Wholesale & retail | 2004 |
| Ceramic Family Ltd | Wholesale & retail | 2023 |
| Chainstay Limited | Construction | 1987 |
| Chalotra Properties Ltd | Real estate | 1997 |
| Champion Enterprises (UK) Limited | Real estate | 2003 |
| Chancery Projects Limited | Construction | 1998 |
| Chaplin Bros (Birmingham) Limited | Manufacturing | 1922 |
| Char Holdings Limited | Financial services | 2024 |
| Charles Flooring Limited | Other services | 2002 |
| Charles Taylor (Properties) Limited | Real estate | 1987 |
| Charlie Brown Limited | Wholesale & retail | 1999 |
| Chartercare (West Midlands) Limited | Health & social care | 1999 |
| Chaudhry Tech Ltd | Information & communication | 2026 |
| Chillo Automation Limited | Manufacturing | 2004 |
| Chima Properties Limited | Real estate | 1999 |
| Chorley Developments Limited | Construction | 1987 |
| Chuangguan Trade Ltd | Wholesale & retail | 2023 |
| Circle Financial Services Limited | Financial services | 1998 |
| Circle Insurance Services Limited | Financial services | 1991 |
| Circle Specialist Services Ltd | Professional & scientific | 1986 |
| City Logistics (UK) Limited | Transport & logistics | 1997 |
| City Osteopaths Limited | Health & social care | 2002 |
| CJC Automotive Business Solutions Limited | Professional & scientific | 2007 |
| CL Storage Solutions Ltd | Transport & logistics | 2025 |
| Clark Diamonds Limited | Wholesale & retail | 1984 |
| Clarkeprint Limited | Manufacturing | 2000 |
| Clarus Homes Ltd | Extraterritorial | 2004 |
| Clarus Real Estate Limited | Real estate | 2004 |
| Classic Car Components Direct Limited | Professional & scientific | 2005 |
| Classic Casino Entertainments Limited | Arts & recreation | 2001 |
| Classic Casino Limited | Arts & recreation | 2001 |
| Classic Manufacturing Limited | | 1988 |
| Claverley Developments Limited | Construction | 2006 |
| Clayton Furnaces Limited | Professional & scientific | 1995 |
| Clayton Holdings Limited | Financial services | 2003 |
| Clean & Tidy (Harborne) Limited | Administrative & support | 2002 |
| Clean & Tidy (Midlands) Limited | Administrative & support | 2002 |
| Clews Heating Limited | Construction | 2005 |
| Clicknstock Limited | Wholesale & retail | 2024 |
| Climax Realisations Limited | Professional & scientific | 1997 |
| Club Class Golf Repairs Limited | Arts & recreation | 2003 |
| CMK Holdings Limited | Professional & scientific | 1980 |
| Coatapart Limited | Manufacturing | 1976 |
| Cocasa Limited | Wholesale & retail | 2003 |
| Cofinoga Funding One LP | | 2003 |
| Coherent Graphics Ltd | Information & communication | 2006 |
| Coleman Baines Limited | Manufacturing | 2021 |
| Coles Lane Management Company Limited | Households | 2000 |