| CCL Holdings Limited | Professional & scientific | 1993 |
| CDW Investment Properties Limited | Real estate | 2022 |
| Cebeci Kitchen Ltd | Hospitality | 2025 |
| Centrica Energy Storage Limited | Mining & quarrying | 1996 |
| Centrica Offshore Investments Limited | Mining & quarrying | 2024 |
| Centrica Offshore UK Limited | Mining & quarrying | 2001 |
| Centrica Storage Holdings Limited | Financial services | 2002 |
| Chainyards Developments Limited | Construction | 2025 |
| Chandler Asset Management Limited | Real estate | 2014 |
| Chandler Holdings Limited | Financial services | 2016 |
| Chandler Wealth Management Limited | Financial services | 2010 |
| Chartus.X Ltd | Wholesale & retail | 2020 |
| Chase Electrical Solutions Ltd | Construction | 2026 |
| Checkrail Ltd | Administrative & support | 2014 |
| Chelsea Bridge Developments Limited | Real estate | 2019 |
| Chen's Chinese Takeaway Limited | Hospitality | 2016 |
| Chicken HU13 Limited | Hospitality | 2026 |
| China Garden Takeaway Hessle Ltd | Hospitality | 2022 |
| Chris Trans&Clean Exclusive Ltd | Transport & logistics | 2022 |
| Chris Zanetti Limited | Professional & scientific | 2013 |
| Church Road Altofts Developments Limited | Construction | 2026 |
| Citech Energy Recovery Solutions (UK) Ltd | Manufacturing | 2013 |
| City & Yorkshire Properties Limited | Professional & scientific | 1981 |
| City GAS Ltd | Construction | 2006 |
| Citygate North Lettings Ltd | Real estate | 2026 |
| Clark Kent Ltd | Real estate | 2022 |
| CLAY10 Creative Ltd | Information & communication | 2016 |
| CLD Fabrications Limited | Manufacturing | 2015 |
| Cleaning by Elizabeth Ltd | Administrative & support | 2024 |
| Clearview Partners Limited | Health & social care | 2012 |
| Click Digital Solutions Ltd | Information & communication | 2019 |
| Click Web Marketing Limited | Professional & scientific | 2013 |
| CLL Computing Ltd | Wholesale & retail | 2017 |
| Cloud Investments (Yorkshire) Ltd | Administrative & support | 2025 |
| Club House @ Beverley Golf 2025 Limited | Hospitality | 2025 |
| Cobble Lane Ltd | Administrative & support | 2020 |
| Coffee Connection (Hull) Limited | Hospitality | 2023 |
| Commercial Utilities Management Ltd | Professional & scientific | 2014 |
| Compact Foods Limited | Wholesale & retail | 2015 |
| Compact Supplies Limited | Wholesale & retail | 2015 |
| Company Accounts Limited | Agriculture & fishing | 1995 |
| Compic T/A Fibrewrap UK Limited | Construction | 2019 |
| Complete Diamond Drilling Services Limited | Construction | 1997 |
| Complete Diamond Solutions Limited | Construction | 2014 |
| Complete Hire Services Limited | Manufacturing | 2004 |
| Composites Construction UK Limited | Construction | 2010 |
| Computanet Solutions Limited | Information & communication | 2004 |
| Connaught Air Services Limited | Transport & logistics | 1985 |
| Connect Specialist Therapy Ltd | Health & social care | 2023 |
| Conservation & Construction Limited | Wholesale & retail | 1978 |
| Continental Fine Foods Limited | Extraterritorial | 1987 |
| Coolships 2 Limited | Extraterritorial | 2012 |
| Cosmetic & Family Dentistry (Hessle) Limited | Health & social care | 2020 |
| Cottingham Italian Limited | Hospitality | 2026 |
| Cottingham Recreation Club,Limited(The) | Arts & recreation | 1927 |
| Country Park Leisure Limited | Hospitality | 2016 |
| Courageous Fishing LLP | | 2012 |
| Cowson Trading Ltd | Wholesale & retail | 2023 |
| CR Homes and Maintenance LLP | | 2011 |
| CR Reynolds (Management Services) Limited | Extraterritorial | 2003 |
| Craiglamb Ltd | Education | 2012 |
| Cranberry Properties (Hull) Limited | Real estate | 2021 |
| Cranswick Convenience Foods Limited | Extraterritorial | 1988 |
| Cranswick Country Foods (Norfolk) Limited | Extraterritorial | 1965 |
| Cranswick Country Foods PLC | Manufacturing | 1984 |
| Cranswick Gourmet Bacon Company Limited | Extraterritorial | 2003 |
| Cranswick Gourmet Pastry Company Limited | Extraterritorial | 2011 |
| Cranswick Gourmet Sausage Company Limited | Extraterritorial | 1995 |
| Cranswick Mediterranean Foods Limited | Extraterritorial | 2023 |
| Cranswick Mill Limited | Extraterritorial | 2020 |
| Cranswick Pet Products Limited | Manufacturing | 1967 |
| Cranswick PLC | Professional & scientific | 1972 |
| Cranswick Trustees Limited | Extraterritorial | 2001 |
| Cranswick Tuck Marketing Limited | Extraterritorial | 1985 |
| Crating Solutions Limited | Transport & logistics | 2011 |
| Creatives in the Attic Limited | Information & communication | 2011 |
| Croch-May Ltd | Manufacturing | 2024 |
| Croft Hall Estates Limited | Real estate | 1974 |
| Cromwell Rubber Company Limited | Professional & scientific | 1977 |
| Cross Keys Cowden Limited | Hospitality | 2019 |
| Crosslands Holdings Limited | Real estate | 2025 |
| Crown Chicken Limited | Agriculture & fishing | 2003 |
| CT Travel Group Ltd | Administrative & support | 1997 |
| Curry Brothers Property Ltd | Real estate | 2018 |
| Cyclic Investments Limited | Information & communication | 1999 |
| D Longthorp Services Limited | Construction | 2016 |
| D.F. Services Limited | Construction | 2002 |
| DAN Shipping and Chartering Limited | Transport & logistics | 1987 |
| Dataflowiq Ltd | Manufacturing | 2023 |
| Dave Crawshaw Roofing Specialist Limited | Construction | 2022 |
| David Lund Design & Advertising Limited | Professional & scientific | 2004 |
| David OGG and Partner Limited | Professional & scientific | 2012 |
| Dawson Property Ltd | Real estate | 2023 |
| DDD Ventures Limited | Professional & scientific | 2013 |
| Defined Impact Limited | Professional & scientific | 2022 |
| Dellstrong Limited | Financial services | 2026 |
| Dema Residential Homes Limited | Health & social care | 1989 |
| Denman Technical Limited | Professional & scientific | 2012 |
| Design Build Web Limited | Information & communication | 2017 |
| Devine Law Limited | Professional & scientific | 2006 |