| CDP (Eden Business Park) Ltd | Households | 2017 |
| CDP (Portland Street) Limited | Hospitality | 2019 |
| CDP (Welford Road) Limited | Hospitality | 2019 |
| Cedar Garden Rooms Ltd | Construction | 2016 |
| Ceejay Investment Properties Limited | Financial services | 2017 |
| Celco Limited | Construction | 2026 |
| Centika Logistics Limited | Transport & logistics | 2014 |
| Chapel House Apartments (Management) Limited | Households | 2005 |
| Charles Walker & Co.Limited | Manufacturing | 1913 |
| Charles Walker Consolidated Limited | Manufacturing | 1908 |
| Charlie Hodgson Performance Ltd | Arts & recreation | 2002 |
| Chaudhuri Medical Services Ltd | Health & social care | 2026 |
| Checkmate Fire Compliance Limited | Construction | 2012 |
| Checkmate Fire Solutions Limited | Construction | 2003 |
| Checkmate Holdings Group Limited | Construction | 2018 |
| Checkmate Holdings Ltd | Construction | 2016 |
| Cheetham Hill Furnishings Ltd | Wholesale & retail | 2020 |
| Cherry Bank Cottages Limited | Hospitality | 2010 |
| Cherry Tree Farm (Halifax) Ltd | Hospitality | 2016 |
| Cherwell Productions Limited | Information & communication | 2016 |
| Chief Officers Group Europe Limited | Administrative & support | 2012 |
| Chilli Wizards Ltd | Hospitality | 2015 |
| Chloe & Co (Hair) Limited | Other services | 2025 |
| CJS Mechanical Services Ltd | Construction | 2018 |
| Clarity Car Group Ltd. | Wholesale & retail | 2015 |
| Clark Property Ltd | Real estate | 2015 |
| Clark Quarmby Limited | Manufacturing | 1997 |
| Clark Quarmby Properties Limited | Real estate | 2019 |
| Class by Nature Limited | Professional & scientific | 2018 |
| Classical Flagstones Limited | Construction | 1988 |
| Clays Civils and Landscapes UK Ltd | Construction | 2020 |
| Clays Groundworks UK Ltd | Construction | 2025 |
| Clays Retaining Systems UK Ltd | Construction | 2025 |
| Clearsphere Pharma Engineering Ltd | Manufacturing | 2008 |
| Cobbett Hall Management Company Limited | Households | 2016 |
| Codie Roper-Jamieson Conveyancing Ltd | Professional & scientific | 2026 |
| Coffee Cali (Huddersfield) Limited | Hospitality | 2018 |
| Coffee, Cake and Companionship CIC | Health & social care | 2025 |
| Colchester Lathe Co. Limited | Manufacturing | 2014 |
| Colchester Machine Tool Solutions Ltd | Manufacturing | 1916 |
| Colt Enterprise (Calderdale) Ltd | Wholesale & retail | 2005 |
| Compulock Integrated Solutions Limited | Administrative & support | 2002 |
| Conek Cloud Ltd | Information & communication | 2020 |
| Connect Assembly Limited | Professional & scientific | 2004 |
| Consult MT Limited | Information & communication | 2011 |
| Contrec (Holdings) Limited | Financial services | 2014 |
| Contrec Ltd | Manufacturing | 2011 |
| Control House Limited | Manufacturing | 2003 |
| Conveyor Belt Technology Limited | Manufacturing | 2007 |
| Conwy Properties Limited | Real estate | 2001 |
| Cooper Green Holdings Limited | Financial services | 2019 |
| Coopers Weaving Limited | Manufacturing | 2010 |
| Copioussamson Ltd | Manufacturing | 2023 |
| Core Facility Services Group Limited | Professional & scientific | 2013 |
| Core Facility Services Limited | Professional & scientific | 2005 |
| Cosy Home Furnishings Limited | Manufacturing | 2001 |
| Cowley Fire Limited | Other services | 2000 |
| CPM Group Limited | Manufacturing | 1971 |
| Craft Upholstery Limited | Other services | 2013 |
| Craig Engineering (HX) Limited | Manufacturing | 2014 |
| Creative BOO Limited | Arts & recreation | 2024 |
| Creative Glazing Solutions Ltd | Construction | 2023 |
| Creative Learning Childcare Limited | Education | 2015 |
| Creative Mill Limited | Professional & scientific | 2009 |
| Crest IT Solutions Limited | Information & communication | 2006 |
| Cricketers Green Flat Management Company (3) Limited | Households | 1981 |
| Critical Path Sports Limited | Education | 2021 |
| CRJ Holdings Ltd | Wholesale & retail | 2011 |
| CRM Properties Limited | Real estate | 2022 |
| Croft Lyons Limited | Wholesale & retail | 2015 |
| Crompton Engineering Holdings Limited | Manufacturing | 2018 |
| Crompton Mouldings Limited | Manufacturing | 2007 |
| Crossfit Halifax Limited | Arts & recreation | 2014 |
| Crossway Scaffolding (Elland) Limited | Construction | 1995 |
| Crustella Ltd | Hospitality | 2025 |
| CSH Performance Ltd | Wholesale & retail | 2021 |
| CTS Holdings Yorkshire Limited | Financial services | 2023 |
| CTS Ironmongery Limited | Wholesale & retail | 1992 |
| CUB Hub Ltd | Arts & recreation | 2026 |
| Cusack Civils Ltd | Construction | 2019 |
| D &V Bars & Inns Trading AS the Wellington Limited | Hospitality | 2015 |
| D R E Construction Limited | Construction | 2022 |
| D&K Lettings Ltd | Real estate | 2025 |
| D2SCO Limited | Health & social care | 2013 |
| Dabbler Ltd | Professional & scientific | 2018 |
| DAC Air Conditioning Limited | Construction | 1993 |
| Daedalus Planning Services Ltd | Professional & scientific | 2003 |
| Dalestone Concrete Products Limited | Professional & scientific | 1983 |
| Dampsurv Ltd | Professional & scientific | 2025 |
| Darcey HEY Management Limited | Households | 2008 |
| Darodatson Limited | Financial services | 2024 |
| Darvill Electrical Limited | Construction | 2011 |
| Dave Kaye Associates Ltd | Professional & scientific | 2011 |
| Dawn Lesley's Salon Limited | Other services | 2012 |
| Ddjc Limited | Construction | 2012 |
| DE Noble Motors Limited | Manufacturing | 2007 |
| DE Noble Vines Limited | Manufacturing | 2007 |
| Decisive UK Holdings Limited | Financial services | 2024 |
| Deckmaster (Yorkshire) Limited | Wholesale & retail | 2012 |
| Decorative Panels Components Limited | Manufacturing | 2001 |