| China Connect HK Limited | Wholesale & retail | 2019 |
| Chouhan Limited | Other services | 2013 |
| Chris Milnes Building Contractors Ltd | Construction | 2017 |
| Chris Milnes Ltd | Construction | 2000 |
| Chris Milnes Property Care Ltd | Construction | 2012 |
| Chrisfield TEN Limited | Professional & scientific | 2020 |
| Chroma Bodyshop Ltd | Wholesale & retail | 2026 |
| Cics (Keighley) Limited | Construction | 2017 |
| Cinders Barbecues Limited | Manufacturing | 1988 |
| Cinetic Carbon Compounds Limited | Manufacturing | 2003 |
| Cinnamon Spice (Silverdale) Limited | Hospitality | 2013 |
| Circle Ltd. | Information & communication | 2019 |
| Cirteq Limited | Manufacturing | 1995 |
| CIS Made Easy Limited | Professional & scientific | 2013 |
| CIT Recage Ltd | Wholesale & retail | 2026 |
| City Travel (Yorkshire) Limited | Transport & logistics | 2007 |
| Cityscape Services Limited | Professional & scientific | 2018 |
| Cjaw Limited | Households | 2023 |
| Cjghb Holdings Limited | Transport & logistics | 2025 |
| CK Joinery Contractors Ltd | Construction | 2021 |
| CLA Urban Development Limited | Construction | 2007 |
| CLA Urban International Ltd | Construction | 2015 |
| Claire Corp Financial Limited | Professional & scientific | 2022 |
| Clapham & Woolley Limited | Manufacturing | 2002 |
| Claremont Plastering Ltd | Construction | 2023 |
| Clarence Advocacy & Compliance Ltd | Professional & scientific | 2025 |
| Clark Contracting (Haworth) Limited | Agriculture & fishing | 2023 |
| Clarkes Trading Ltd | Professional & scientific | 2021 |
| Clashacrow Limited | Professional & scientific | 2022 |
| Classic Windows Yorkshire Limited | Manufacturing | 2021 |
| Clayhill Commercial Buildings Ltd | Construction | 2021 |
| Clean Eats Kitchen Ltd | Administrative & support | 2018 |
| Cleancare Services (UK) Ltd | Administrative & support | 2013 |
| Clearer Energy Ltd | Professional & scientific | 2010 |
| Clever Clogs Laundry Limited | Other services | 2023 |
| Cleverautomotive Ltd | Wholesale & retail | 2008 |
| CLH Entertainments Ltd | Arts & recreation | 2026 |
| Click Symptoms Limited | Health & social care | 2012 |
| Cliffe Castle Pavilion Cafe Limited | Hospitality | 2025 |
| Cliffe Farm Highland Fold Ltd | Agriculture & fishing | 2020 |
| Cliffe Green Enterprises Limited | Real estate | 2005 |
| Climbing Cards Ltd | Extraterritorial | 2025 |
| Clinicrx Limited | Health & social care | 2024 |
| Clockwork EYE Video Training Ltd | Information & communication | 2023 |
| Clockwork Finance Ltd | Other services | 2007 |
| Clothes Cabin Ltd | Wholesale & retail | 2021 |
| Clover Business Solutions Ltd | Professional & scientific | 2026 |
| Cloverkey Properties Ltd | Households | 2025 |
| Club 1990. Ltd | Other services | 2021 |
| Club Energy (Retford) Limited | Arts & recreation | 2018 |
| CM Scientific Limited | Wholesale & retail | 1980 |
| CMP Business Services LLP | | 2017 |
| Coach House (Steeton) Management Company Limited | Households | 2004 |
| Coates & Co Properties Ltd | Real estate | 2023 |
| Cobbydale Car & Commercial Limited | Other services | 2020 |
| Cobbydale Construction Limited | Construction | 2003 |
| Cobbydale Forge Ltd | Arts & recreation | 2021 |
| Cobbydale Management (1996) Limited | Households | 1996 |
| Cobbydale Way Management Company Limited | Households | 2022 |
| Cobimed Limited | Health & social care | 2023 |
| Cochrane Building Services Limited | Construction | 2012 |
| Cochrane Cottages Limited | Real estate | 2021 |
| Cochrane Property Maintenance Limited | Construction | 2012 |
| Coco (Keighley) Ltd | Hospitality | 2021 |
| Coco Aesthetics Laser & Beauty Limited | Other services | 2022 |
| Coco Diner Limited | Hospitality | 2024 |
| Coco EAT in Limited | Hospitality | 2024 |
| Coco Electronics Limited | Wholesale & retail | 2023 |
| Coco Nelson Ltd | Hospitality | 2025 |
| Coco Takeout Ltd | Hospitality | 2025 |
| Code & Quest Ltd | Information & communication | 2013 |
| Code for Good CIC | Information & communication | 2025 |
| Codered Life Coaching Ltd | Other services | 2023 |
| Coffydale Ltd | Hospitality | 2023 |
| Cole Plumbing, Heating and GAS Services Limited | Construction | 2023 |
| Cole's Urfd Services Limited | Professional & scientific | 2011 |
| Colebrook Computing Limited | Information & communication | 1991 |
| Coleman's Plastering Solutions Ltd | Construction | 2019 |
| Colmarc Ltd | Administrative & support | 2021 |
| Colosseum Performance Ltd | Arts & recreation | 2021 |
| Colosseum Performance Products Ltd | Wholesale & retail | 2025 |
| Colossus K9 Ltd | Other services | 2017 |
| Colour on Canvas Limited | Arts & recreation | 2008 |
| COMIC2024 Ltd | Hospitality | 2024 |
| Commercial Flooring (7 Group) Limited | Construction | 2023 |
| Community Lions Foundation | Arts & recreation | 2007 |
| Companion Care With JO Ltd | Health & social care | 2025 |
| Compass Mount Plumbing & Heating Ltd | Construction | 2021 |
| Complete Commercial Solutions Ltd | Administrative & support | 2025 |
| Complete Estate Planning Limited | Professional & scientific | 2014 |
| Comprendo Ltd | Administrative & support | 2008 |
| Computer Universe Limited | Information & communication | 2011 |
| Concentric Counters Limited | Manufacturing | 2003 |
| Concentric Design Limited | Professional & scientific | 1992 |
| Concentric Holdings Limited | Financial services | 2019 |
| Concept Fabrics Limited | Wholesale & retail | 2005 |
| Concept Flooring Midlands Ltd | Wholesale & retail | 2024 |
| Concept Flooring NW Ltd | Wholesale & retail | 2019 |
| Concept Flooring Yorkshire Ltd | Wholesale & retail | 2024 |
| Conceptrus Ltd | Manufacturing | 2019 |