| Cobden Research Limited | Professional & scientific | 2013 |
| Coble Landing Roundabouts Limited | Arts & recreation | 1973 |
| Codan Services Ltd | Construction | 2025 |
| Coday Ltd | Hospitality | 2023 |
| Colenso Surveying Ltd | Professional & scientific | 2014 |
| Coletta and Tyson Limited | Agriculture & fishing | 1999 |
| Coletta Holdings Limited | Professional & scientific | 1999 |
| Collections (Beverley) Limited | Wholesale & retail | 2015 |
| Collingwood and Atkin Property Development Limited | Real estate | 2024 |
| Collison House (Manco) Limited | Hospitality | 2016 |
| Coltman House Limited | Real estate | 2017 |
| Comandulli UK Ltd | Professional & scientific | 2020 |
| Comforting Hands Ltd | Health & social care | 2020 |
| Commercial Systems Consultants Limited | Information & communication | 1989 |
| Communique Publishing Limited | Information & communication | 2009 |
| Community Options Ltd | Administrative & support | 2024 |
| Complete Retail Management Ltd | Professional & scientific | 2012 |
| Composite Blade Repairs Ltd | Professional & scientific | 2018 |
| Computer Support (Beverley) Limited | Other services | 2006 |
| Comsyco Limited | Professional & scientific | 2000 |
| Conington 1966 Limited | Extraterritorial | 2013 |
| Conman Haulage Limited | Transport & logistics | 2003 |
| Connect E&I Contractors LLP | | 2013 |
| Connect Electrical East Yorkshire Limited | Construction | 2019 |
| Construq Services Limited | Professional & scientific | 2023 |
| Continuum Rail Limited | Professional & scientific | 2025 |
| Contract Hover Limited | Agriculture & fishing | 1971 |
| Cook Painters & Decorators Limited | Construction | 2006 |
| Cooper Trux Ltd | Transport & logistics | 2022 |
| Coppini Ventures Ltd | Hospitality | 2025 |
| Corbyn Ward Properties Limited | Real estate | 2019 |
| Core Commercial Finance Limited | Financial services | 2010 |
| Core Independent Financial Planning Ltd | Financial services | 2010 |
| Core RE South East (Homes) Ltd | Real estate | 2014 |
| Corporation Farm Cottages Ltd | Real estate | 2021 |
| Correct Compliance Limited | Professional & scientific | 1998 |
| Cotta Court Apartments Management Company Limited | Real estate | 2006 |
| Cottingham Joinery Company Limited | Manufacturing | 1971 |
| Cottingham Lawn Tennis Club Limited(The) | Arts & recreation | 1951 |
| Country Golf Hull Ltd | Arts & recreation | 2019 |
| Country Woodwork Limited | Financial services | 2015 |
| Coupe Deuce Ltd | Administrative & support | 2015 |
| Couperman Ltd | Administrative & support | 2014 |
| Coworking Nomads Ltd | Information & communication | 2018 |
| COX Communications Ltd | Professional & scientific | 2026 |
| COX Family Properties Limited | Real estate | 2024 |
| Coxon Civils Limited | Construction | 2026 |
| Coxwold Ltd | Financial services | 2024 |
| Coxwold Properties Limited | Real estate | 2010 |
| COY Cruisin Ltd | Manufacturing | 2025 |
| CR Engineers Ltd | Construction | 2026 |
| Cranbrook (Hull) CIC | Arts & recreation | 2023 |
| Craven Household Services Ltd | Households | 2026 |
| CRC Law Limited | Professional & scientific | 2023 |
| CRE8TIVE IT Solutions Limited | Information & communication | 2018 |
| Creations (Beverley) Limited | Manufacturing | 2017 |
| Creative Asian Ltd | Hospitality | 2018 |
| Creative Day Care Services Ltd | Health & social care | 2013 |
| Creative Rowe Limited | Professional & scientific | 2012 |
| CRI Group Limited | Extraterritorial | 2015 |
| Cricket Coach Floor Mats Limited | Extraterritorial | 2020 |
| Cricketers Court Management Company Limited | Households | 2011 |
| Croft Services Ltd | Mining & quarrying | 2015 |
| Crosby Ferguson & Medcalf Limited | Professional & scientific | 2008 |
| Crossbar Challenge UK Limited | Arts & recreation | 2025 |
| Crown Recycling UK Ltd | Wholesale & retail | 2026 |
| Crypto Account Services Limited | Information & communication | 2017 |
| CSL Publishing Limited | Information & communication | 1987 |
| Current Contractors Ltd | Construction | 2024 |
| Current Contractors Renewables Ltd | Construction | 2026 |
| Customer First Digital Ltd | Professional & scientific | 2020 |
| CUT MED Limited | Other services | 2025 |
| CW Engineering (UK) Limited | Wholesale & retail | 2013 |
| Cygnus Health Ltd | Health & social care | 2024 |
| D & C (Dunswell) Limited | Extraterritorial | 2011 |
| D & D Decorating Services Limited | Construction | 2011 |
| D & E Marsland Transport Limited | Transport & logistics | 2016 |
| D & H Holdings West Ltd | Real estate | 2026 |
| D G R Leisure Limited | Hospitality | 2012 |
| D.P Forklift Hire Limited | Transport & logistics | 2020 |
| D1ANE Investments Limited | Financial services | 2016 |
| Daco Properties Limited | Financial services | 2007 |
| Dainget Mill Limited | Wholesale & retail | 2012 |
| Daisy Rose Property Ltd | Real estate | 2021 |
| Daisy Thomas Ltd | Real estate | 2020 |
| Dakota Corporation Limited | Professional & scientific | 1997 |
| Dalby Port Services Limited | Professional & scientific | 2015 |
| Dalton Events Ltd | Arts & recreation | 2023 |
| Daltons Group Ltd | Administrative & support | 2019 |
| DAN DIT Limited | Information & communication | 2012 |
| DAN Fallon PT Limited | Arts & recreation | 2014 |
| DAN Rawding Properties Limited | Construction | 2014 |
| Danbys Precision Engineering Limited | Professional & scientific | 2013 |
| Danielle Fenton Ltd | Other services | 2003 |
| Dantech Automotive Ltd | Professional & scientific | 2026 |
| Danton Fireplaces Limited | Wholesale & retail | 2005 |
| Dare Greatly Limited | Education | 2014 |
| Data to Decisions Limited | Information & communication | 2015 |
| David Baarda Limited | Transport & logistics | 2012 |
| David Charles Consulting (Beverley) Limited | Information & communication | 1998 |