| C+C Landscapes Limited | Construction | 2003 |
| C.B.F. Screen Prints Limited | Manufacturing | 1978 |
| C.H. Wood Security (Bradford) Limited | Administrative & support | 1996 |
| Caddick (AVH Developments) Limited | Extraterritorial | 1999 |
| Caddick (Harrogate) Limited | Real estate | 1994 |
| Caddick (Hove) Limited | Extraterritorial | 1991 |
| Caddick (Irlam) Limited | Real estate | 1992 |
| Caddick (JPC Developments) Limited | Financial services | 2001 |
| Caddick (Knowsley) Limited | Real estate | 2006 |
| Caddick (Rose Wharf) Limited | Extraterritorial | 1997 |
| Caddick (Scarborough) Limited | Real estate | 2000 |
| Caddick Developments Limited | Real estate | 1990 |
| Caddick Group Limited | Professional & scientific | 1986 |
| Caddick Living Limited | Real estate | 2007 |
| Caged Steel Limited | Arts & recreation | 2005 |
| Calda-Morley Limited | Wholesale & retail | 1994 |
| Calder Architectural Services Limited | Professional & scientific | 2004 |
| Calder Building Services (UK) Limited | Manufacturing | 2006 |
| Calder Clutch Company Limited | Manufacturing | 2003 |
| Calder Property Management Limited | Professional & scientific | 2007 |
| Calder Sheetmetal Limited | Manufacturing | 2007 |
| Calder Valley Marine (Inns) Ltd | Hospitality | 2007 |
| Calderdale Catering Limited | Hospitality | 1998 |
| Calderdale Citizens Advice Bureau | Other services | 1997 |
| Caley Hall Farm Limited | Agriculture & fishing | 1996 |
| Call OUT Carpets Ltd. | Wholesale & retail | 1997 |
| Calomax Limited | Manufacturing | 1991 |
| Camel Precast Solutions Ltd | Manufacturing | 2020 |
| Camsonic Limited | Construction | 2002 |
| Camwheat PIE Machine Company Limited | Manufacturing | 1998 |
| Cappresso Coffee Limited | Professional & scientific | 1994 |
| Cardan Air Conditioning Limited | Energy | 2002 |
| Carjohn Consulting Limited | Real estate | 2003 |
| Carlton Plasterers Limited | Construction | 2005 |
| Carnaudmetalbox Engineering Limited | Manufacturing | 1949 |
| Carpetcare (North) Limited | Administrative & support | 2005 |
| Carpetco Limited | Wholesale & retail | 2001 |
| Carr Mills Sheet Metal Works Ltd | Administrative & support | 2006 |
| Carra Business Solutions Limited | Extraterritorial | 1998 |
| Carringtons Accountants Limited | Extraterritorial | 2004 |
| Cartasport Leisure Limited | Wholesale & retail | 1986 |
| Casa Bahia Ltd | Hospitality | 2002 |
| Casa MAR Menor Ltd | Real estate | 2003 |
| Casa Property Management Limited | Real estate | 2002 |
| Cascadecore Group Ltd | Wholesale & retail | 2025 |
| Castleford Specsavers Limited | Wholesale & retail | 1992 |
| Castleford Visionplus Limited | Wholesale & retail | 1992 |
| Castlemoat Limited | Construction | 1994 |
| Catalyst Creative Imaging Limited | Manufacturing | 1983 |
| Cawley Associates Limited | Hospitality | 1987 |
| CCL Syrinx (Kontur Holdings) Limited | Financial services | 2021 |
| CD Catering Ltd | Hospitality | 2020 |
| CDB Leeds Limited | Financial services | 2004 |
| CDP (Rotherham) Limited | Real estate | 1990 |
| Centreline Shopfitting Projects Limited | Construction | 1999 |
| Chabad Lubavitch (Leeds) Limited | Other services | 2008 |
| Chaly Fields Limited | Households | 2004 |
| Chana Glass Ltd | Manufacturing | 2003 |
| Changeprime Limited | | 1987 |
| Chapel Court Management Company (Idle) Limited | Real estate | 2006 |
| Chappell (Transport & Distribution) Limited | Wholesale & retail | 1996 |
| Charles F Stead (Holdings) Limited | Extraterritorial | 2006 |
| Charles F Stead (Properties) Limited | Real estate | 2005 |
| Charles Mayman and Associates Limited | Professional & scientific | 2004 |
| Charlesworth Holdings Limited | Manufacturing | 1962 |
| Charlies Sarni Bar Limited | Hospitality | 2003 |
| Charside Investments Limited | Real estate | 1963 |
| Chemfix Products Limited | Manufacturing | 2001 |
| Chequered Flag Karting Limited | Wholesale & retail | 1989 |
| Chevin Cycles Limited | Wholesale & retail | 1997 |
| Chez VIN Limited | Wholesale & retail | 2005 |
| Chorlton Trade Paints Limited | Wholesale & retail | 1952 |
| CHP Groundworks & Building Contractors Limited | Construction | 2003 |
| Chris Garsed Heating Services Limited | Construction | 2005 |
| Chris Grant & Co. Ltd | Professional & scientific | 1999 |
| Chris Sinclair Accountants Ltd | Professional & scientific | 2003 |
| Chrisben Property Investment Ltd | Real estate | 2023 |
| Christopher Waud & Co. Limited | Professional & scientific | 1934 |
| Chrystyn Limited | Professional & scientific | 2004 |
| Church Property Holdings Limited | Real estate | 2004 |
| Citygate Developments NO.1 Limited | Construction | 2006 |
| Class CAD (UK) Limited | Information & communication | 2007 |
| Classic Glazing Systems (UK) Limited | Construction | 2003 |
| Clean Linen Co. Limited | Other services | 2024 |
| Cliffe Avenue Limited | Wholesale & retail | 2004 |
| Cliffe Vale Residential Home Limited | Health & social care | 2001 |
| COB Castle Limited | Professional & scientific | 2009 |
| Cobley & Cockshott Limited | Wholesale & retail | 2003 |
| Coffin Covers Limited | Wholesale & retail | 2003 |
| Cold Pro Ltd | Energy | 2021 |
| Collinson & Stelling Limited | Wholesale & retail | 1975 |
| Colne Valley Roofing Limited | | 1979 |
| Colne Valley Rubber Limited | Construction | 1994 |
| Colton Regeneration (Office Park) Limited | Administrative & support | 2001 |
| Combined Masonry Supplies Limited | Wholesale & retail | 2000 |
| Combined Precision Components Limited | Professional & scientific | 1973 |
| Comforest Ltd | Manufacturing | 2020 |
| Commercial Development Consultants Limited | Real estate | 1990 |
| Commercial Development Projects (Hull) Limited | Real estate | 1995 |
| Commercial Development Projects (Project Management) Limited | Administrative & support | 2002 |