| C&J Yorkshire Ltd | Real estate | 2019 |
| C. Stanley Limited | Construction | 2005 |
| C.C. Reed & Company Limited | Agriculture & fishing | 1965 |
| C.J. & A.J. Dixon Limited | Wholesale & retail | 1978 |
| C.K Connect Ltd | Professional & scientific | 2025 |
| C.S. Electrical Services Limited | Construction | 2002 |
| Cammish Butchers (Flamborough) Limited | Wholesale & retail | 2017 |
| Candy Chops Limited | Wholesale & retail | 2021 |
| Candy Factory Ltd | Wholesale & retail | 2015 |
| Candybox Confectionery Limited | Wholesale & retail | 2006 |
| Canton Kitchen Takeaway Ltd | Hospitality | 2021 |
| Capz Ltd | Wholesale & retail | 2025 |
| Car Vault Club Limited | Transport & logistics | 2024 |
| Caravan GAS Services Ltd | Other services | 2008 |
| Cardigan Road Management Company Limited | Households | 2016 |
| Care Meds (UK) Limited | Wholesale & retail | 2012 |
| Carecrest Limited | Hospitality | 2015 |
| Carnaby Caravans Group Limited | Professional & scientific | 2015 |
| Carnaby Group Holdings Ltd | Professional & scientific | 2021 |
| Carousels and Dreams Ltd | Arts & recreation | 2020 |
| Carson's Bistro Limited | Arts & recreation | 2025 |
| CARTER-GEN1-ECO-SYSTEMS Ltd | Professional & scientific | 2025 |
| Carvill-Jackman Arts Ltd | Arts & recreation | 2025 |
| Castle Healthcare Supplies Ltd | Water & waste | 2011 |
| Castle Moss Limited | Professional & scientific | 2022 |
| Catfoss P3 Limited | Financial services | 2023 |
| Cawton House Ltd | Wholesale & retail | 2015 |
| CBT Takeaway Ltd | Hospitality | 2023 |
| Cbuk (Yorkshire) Limited | Administrative & support | 2017 |
| CC Consult Limited | Construction | 2009 |
| CD Modular Solutions Limited | Construction | 2026 |
| CDP Design Limited | Other services | 2012 |
| Cedarbarn Limited | Wholesale & retail | 2022 |
| CG Joinery Services Ltd | Manufacturing | 2015 |
| CH Procurement (UK) Ltd | Wholesale & retail | 2024 |
| Charles a. Wood & Co. Ltd. | Professional & scientific | 2002 |
| Charlton Place Management Company Limited | Households | 2022 |
| Chatsworth Road Properties Limited | Real estate | 2016 |
| Chestnut Property Holdings Ltd | Real estate | 2021 |
| Chestnut Way Limited | Real estate | 2025 |
| Chimprigs Ltd | Wholesale & retail | 2020 |
| Chocolate Box Homes (Yorkshire) Limited | Construction | 2018 |
| Chris Shuttleworth Engineering Limited | Construction | 2007 |
| Chris. Thompson & SON Limited | Extraterritorial | 1964 |
| Christal Properties Ltd | Real estate | 2024 |
| CL Contractors Limited | Construction | 2024 |
| Classic Black Developments Ltd | Construction | 2021 |
| Classic Windows (York) Ltd | Construction | 2018 |
| Cleanair Systems Limited | Extraterritorial | 2008 |
| Clearair Limited | Extraterritorial | 2007 |
| Clearsky Renewables (Yorkshire) Limited | Construction | 2023 |
| Cliff Street (Bridlington) Management Company Limited | Real estate | 2022 |
| Clifford Ward & Co. (Bridlington) Limited | Manufacturing | 1973 |
| Clive Brook Limited | Wholesale & retail | 2007 |
| Cloudy OWL Media Ltd | Information & communication | 2006 |
| Cloughton Limited | Wholesale & retail | 2014 |
| CM Organisation Ltd | Real estate | 2025 |
| Coast & Copper Salon Limited | Other services | 2025 |
| Coast & Country Driffield Limited | Real estate | 2024 |
| Coast & Country Filey Limited | Real estate | 2017 |
| Coast & Country Scarborough Ltd | Real estate | 2015 |
| Coast & Country Yorkshire Limited | Real estate | 2006 |
| Coast and Vale Cottages Limited | Wholesale & retail | 2022 |
| Coast Holidays Limited | Hospitality | 2008 |
| Coastal Camper Conversions Ltd | Hospitality | 2022 |
| Coastal Granite Limited | Construction | 2015 |
| Coastal Heating Service Ltd | Construction | 2021 |
| Coastal Home and Boat Hire Limited | Hospitality | 2014 |
| Coastline Accounting Limited | Professional & scientific | 2025 |
| Coastline Coatings Ltd | Construction | 2024 |
| Cobble Bar and Bistro Limited | Hospitality | 2015 |
| Cobra Security Services (Yorkshire) Limited | Administrative & support | 2013 |
| Cockerill Groundworks Ltd. | Construction | 2004 |
| Cockerill's Harbour Fisheries Limited | Hospitality | 2016 |
| Coffee 41 Ltd | Hospitality | 2025 |
| Collins & Co Pubs Ltd | Hospitality | 2026 |
| Collinskl Limited | Wholesale & retail | 2025 |
| Colman's Camping & Caravanning Limited | Hospitality | 2016 |
| Colman's Guest House Limited | Hospitality | 2016 |
| Colossal Construction & Groundworks Ltd | Construction | 2018 |
| Complete Construction and Joinery Limited | Construction | 2022 |
| Complete Heating (Yorkshire) Limited | Construction | 2022 |
| Complete Roofing Solutions Yorkshire Ltd | Construction | 2022 |
| Connsort Limited | Construction | 2013 |
| Conservatory Design Limited | Professional & scientific | 2018 |
| Cookson Electrical Solutions Ltd | Energy | 2020 |
| Corbett Estates Limited | Real estate | 2020 |
| Cosford House Accommodation Limited | Health & social care | 2013 |
| Cottam Property Ltd | Construction | 2023 |
| Cowling Luke Limited | Transport & logistics | 2017 |
| CP Autobodys Limited | Wholesale & retail | 2009 |
| CR Properties (Yorkshire) Ltd | Real estate | 2026 |
| Craig Chambers Limited | Information & communication | 2018 |
| Crank TEC Ltd | Manufacturing | 2018 |
| Creations on the Coast Ltd | Professional & scientific | 2025 |
| Crescent Garage Limited | Wholesale & retail | 2003 |
| Crescent Grange Pigs Limited | Agriculture & fishing | 2002 |
| Cresco Marketing (Yorkshire) Ltd | Professional & scientific | 2024 |
| Crossfit Barbaric Limited | Arts & recreation | 2015 |
| Crystal Dawn Fishing Limited | Agriculture & fishing | 2005 |