| Converta Agency Ltd | Professional & scientific | 2012 |
| Conzulta Ltd | Information & communication | 2021 |
| Cooke Szefer Property Holdings Limited | Real estate | 2017 |
| Cooking With Noodles Limited | Education | 2013 |
| Cookridge Developments Limited | Construction | 2019 |
| Cookridge Holdings Limited | Financial services | 2019 |
| Cookridge Homes Limited | Real estate | 2003 |
| Cool Badge Limited | Professional & scientific | 2007 |
| Coolcrutches Ltd | Manufacturing | 2006 |
| COOP5 Ltd | Financial services | 2019 |
| Cooper Coding Solutions Ltd | Information & communication | 2023 |
| Cooper Park Wealth Management Limited | Financial services | 2003 |
| Cooper-Rose Associates Ltd | Administrative & support | 2016 |
| Coopers Cottages Limited | Hospitality | 2011 |
| Cope Industrial Holdings Limited | Real estate | 1973 |
| Copgrove Holdings Limited | Financial services | 2023 |
| Copgrove Party Events LLP | | 2010 |
| Copley Property Services Limited | Health & social care | 2025 |
| Coppice Beck Court Management Limited | Households | 1976 |
| Coppice Beck Court Residents Ltd | Real estate | 2023 |
| Coppice Court Management Company Limited | Households | 1985 |
| Coppice Family Office Limited | Professional & scientific | 2024 |
| Coppice Grange Property Management Limited | Households | 1984 |
| Coppice Managers Limited | Hospitality | 2001 |
| Coppice View Management 2015 Limited | Financial services | 2015 |
| Coral Management & Consulting Limited | Professional & scientific | 2019 |
| Corebuild Joinery & Building Services Limited | Construction | 2013 |
| Coretime Software Limited | Information & communication | 2009 |
| Corevista for Trade Ltd | Wholesale & retail | 2021 |
| Corlumen Ltd | Administrative & support | 2024 |
| Corner Spa Properties Limited | Real estate | 2024 |
| Cornering Force Limited | Professional & scientific | 2008 |
| Cornish Mims Limited | Real estate | 2021 |
| Corns Holdings Limited | Professional & scientific | 2015 |
| Corns Property Limited | Real estate | 2021 |
| Corona Virus Claims Limited | Extraterritorial | 2020 |
| Corona Virus Compensation Limited | Extraterritorial | 2020 |
| Corpfin Limited | Financial services | 2017 |
| Corporate Officer Solutions Limited | Professional & scientific | 2012 |
| Corporex Ltd | Wholesale & retail | 2019 |
| Corrina Harrison Ltd | Arts & recreation | 2024 |
| Corvus Electrical Solutions Limited | Manufacturing | 2011 |
| Cosmic Riot Limited | Extraterritorial | 2026 |
| Cossack Industries Limited | Administrative & support | 2018 |
| Costcap North Ltd | Professional & scientific | 2025 |
| Cosurge Limited | Professional & scientific | 2015 |
| Cosy Cattery Limited | Other services | 2019 |
| Cotabri Limited | Real estate | 2018 |
| Cote CI Cote LA Ltd | Other services | 2023 |
| Coterie Galleries Limited | Extraterritorial | 2022 |
| Coti Vision Limited | Wholesale & retail | 2015 |
| Cotswold Teak Limited | Wholesale & retail | 2023 |
| Cotswolds Land Co. Limited | Construction | 2024 |
| Coulter Contracting Ltd | Administrative & support | 2024 |
| Counsel & Capital Ltd | Financial services | 2026 |
| Country Butchers (Harrogate) Limited | Wholesale & retail | 2009 |
| Country Home Shutters Limited | Wholesale & retail | 2021 |
| Country Home Shutters North East Limited | Wholesale & retail | 2022 |
| Couthwurstlin Ltd | Hospitality | 2017 |
| Covered Accounting Limited | Professional & scientific | 2026 |
| COVID-19 Virus Compensation Limited | Extraterritorial | 2020 |
| Covill Cottages Limited | Real estate | 2022 |
| COW Creative Agency Ltd | Professional & scientific | 2023 |
| COW Marsh Wind Farm Limited | Energy | 2024 |
| Cowie Consulting Services Ltd | Professional & scientific | 2017 |
| COY Culture Limited | Information & communication | 2021 |
| Cpmr Holdings Limited | Financial services | 2020 |
| CRA1G Limited | Extraterritorial | 2020 |
| Crabtree Antiques Ltd | Wholesale & retail | 2007 |
| Crack Foods Limited | Hospitality | 2026 |
| Crackin Retreats Ltd | Real estate | 2024 |
| Crafted Curves Innovations Ltd | Manufacturing | 2025 |
| Crafting Made Simple Limited | Wholesale & retail | 2020 |
| Crag Vale LLP | | 2012 |
| Craggstone Limited | Information & communication | 2021 |
| Craggstone Property Limited | Real estate | 2024 |
| Cranage Hall Properties Limited | Real estate | 2006 |
| Cranborne House Management Limited | Real estate | 2010 |
| Craskie Estate Limited | Hospitality | 2014 |
| Cravepizza Limited | Hospitality | 2025 |
| CRE8TIVE Apparel Limited | Wholesale & retail | 2023 |
| Cream Hairdressing (Harrogate) Limited | Other services | 2010 |
| Create the Opportunity Limited | Administrative & support | 2011 |
| Creative Crafts Trading Limited | Wholesale & retail | 2017 |
| Creative Formats Ltd | Professional & scientific | 2017 |
| Creative Freedom Holdings Limited | Financial services | 2024 |
| Creative Freedom Investments Limited | Financial services | 2024 |
| Creative Greats Limited | Wholesale & retail | 2021 |
| Creative Live Productions Limited | Arts & recreation | 2020 |
| Creativity in Practice Ltd | Administrative & support | 2015 |
| Credence Wills Ltd | Professional & scientific | 2016 |
| Crescent House (NO. Eleven) Limited | Households | 1986 |
| Crescent River Ltd | Real estate | 2025 |
| Cresson Limited | Wholesale & retail | 2022 |
| Cricketer's Court Richmond Management Company Limited | Households | 2017 |
| Crime Force Ltd | Extraterritorial | 2012 |
| Crimple Hall Limited | Financial services | 2013 |
| Crimple Limited | Wholesale & retail | 1992 |
| Crimple Place Limited | Financial services | 2013 |
| Cringlebar Ltd | Construction | 2003 |