| Conzummate Tech Ltd | Information & communication | 2022 |
| Cooke Fuels and Lubricants Ltd | Wholesale & retail | 2012 |
| Cooker Cosmetics Ltd. | Wholesale & retail | 2022 |
| Cooldelight Desserts Limited | Wholesale & retail | 2002 |
| Cooper & Co Consultative Limited | Administrative & support | 2026 |
| Cooper Brothers Business Group Ltd. | Wholesale & retail | 2018 |
| Cooper Construction and Management Ltd | Construction | 2021 |
| Cooper Invest Limited | Construction | 2015 |
| Coopers Car Sales Manchester Ltd | Wholesale & retail | 2023 |
| Coopers Engineering Services Limited | Professional & scientific | 2025 |
| Copia Vehicle Management Ltd | Information & communication | 2019 |
| Cora Engineering Limited | Extraterritorial | 2021 |
| Corbetts Electrics Limited | Construction | 2024 |
| Corderv Limited | Extraterritorial | 2020 |
| Core Activewear Ltd | Wholesale & retail | 2025 |
| Core Cleaners Ltd | Other services | 2018 |
| Core Cleaning East Ltd | Administrative & support | 2025 |
| Core Cleaning West Ltd | Administrative & support | 2024 |
| Core Maintenance Ltd | Other services | 2021 |
| Core Marketing Europe Limited | Professional & scientific | 2021 |
| Core Traders Limited | Construction | 2011 |
| Core TV Solutions Limited | Information & communication | 2019 |
| Corinne Littlewood Ltd | Real estate | 2021 |
| Corinthian-Casuals Football Club Limited | Arts & recreation | 2019 |
| Coriolis Property Ltd | Professional & scientific | 2006 |
| Cormar (Exports) Limited | Professional & scientific | 1965 |
| Cornerstone Group International Limited | Administrative & support | 1999 |
| Cornucopia Wealth Management Ltd | Financial services | 2020 |
| Cornwall Drive 1956 Limited | Extraterritorial | 2014 |
| Corporate Property Partners Ltd | Professional & scientific | 2009 |
| Corporate Recognition Limited | Professional & scientific | 2006 |
| Corprop Ltd | Professional & scientific | 2009 |
| Corra Linn Dent Ltd | Health & social care | 2023 |
| Cortek Systems Ltd | Information & communication | 2025 |
| Cosalea Jubilee Limited | Hospitality | 2022 |
| Cosmetic Coats Ltd | Wholesale & retail | 2023 |
| Cosmetic Education Academy Limited | Education | 2025 |
| Cosmeticglobal Ltd | Administrative & support | 2019 |
| Cosmic Ears Ltd | Information & communication | 2012 |
| Costello Maintenance Ltd | Administrative & support | 2025 |
| Costprobe Limited | Financial services | 2014 |
| COT N Candi Limited | Wholesale & retail | 2013 |
| Cotter Digital Consultancy Ltd | Professional & scientific | 2023 |
| Cottonmoore Limited | Health & social care | 2023 |
| Cottonstone Holdings Limited | Wholesale & retail | 2018 |
| Cottontails Day Nursery Limited | Health & social care | 2019 |
| Coucher Consultant Services Ltd | Professional & scientific | 2024 |
| Country Creative Group Ltd | Other services | 2025 |
| Country Kitchens (NW) Ltd | Hospitality | 2015 |
| Countryside Houses Ltd | Hospitality | 2023 |
| Countrywide Ceilings & Partitions Ltd | Construction | 2018 |
| Countrywide Exteriors Ltd | Professional & scientific | 2024 |
| Countrywide Fire Protection Limited | Construction | 2022 |
| Courage Global School Limited | Education | 2019 |
| Courao Care & Recruitment Services Limited | Health & social care | 2020 |
| Cover Fencing NW Ltd | Professional & scientific | 2020 |
| Cover Investments Limited | Extraterritorial | 2020 |
| Cover Your Life Limited | Financial services | 2018 |
| COVER365 Limited | Extraterritorial | 2025 |
| Covesco Holding UK Limited | Professional & scientific | 2001 |
| Covesco Music Entertainment Limited | Information & communication | 2021 |
| Covesco Stiftung Ltd | Other services | 2008 |
| Cowie & Riding Limited | Extraterritorial | 1968 |
| Cowie's FUN Park Ltd | Administrative & support | 2023 |
| Coyne & Woods Group Ltd | Financial services | 2020 |
| Cp&N Motors Ltd | Wholesale & retail | 2024 |
| CPD Flooring Contractors Ltd | Construction | 2019 |
| CR Signalling Ltd | Construction | 2024 |
| Cragg Farm Management Limited | Households | 1986 |
| Craig Halket Ltd | Wholesale & retail | 2017 |
| Crampton Heating & GAS Limited | Construction | 2020 |
| Crane-Ai Ltd | Information & communication | 2026 |
| Crankworx Fabrications Ltd | Manufacturing | 2022 |
| Crastone Limited | Real estate | 2010 |
| Crazy Kitchen MCR Ltd | Hospitality | 2024 |
| Crazy UK Limited | Wholesale & retail | 2025 |
| Creating Tomorrow's Forests Ltd | Agriculture & fishing | 2020 |
| Creative Brew Ltd | Information & communication | 2023 |
| Creative Couriers NW Ltd | Transport & logistics | 2004 |
| Credit &Surety Security Ltd | Agriculture & fishing | 2013 |
| Crescent IT Solutions Limited | Professional & scientific | 2024 |
| Crest Commercial Conveyancing Limited | Administrative & support | 2026 |
| Cresta Court (Bury) Ltd | Administrative & support | 2011 |
| Cresta Homes Limited | Extraterritorial | 2021 |
| Crestx Limited | Other services | 2018 |
| Crew Cuts Barber Ltd | Other services | 2022 |
| Crimson Health Ltd. | Wholesale & retail | 2015 |
| Critchley Car & Commercials Limited | Wholesale & retail | 2006 |
| Crmintelligence Ltd | Information & communication | 2019 |
| Croft Design Engineering Ltd | Professional & scientific | 2019 |
| Croft Shareholders Limited | Extraterritorial | 2023 |
| Croftacre Estates Limited | Extraterritorial | 2024 |
| Croftbank Properties Limited | Extraterritorial | 2021 |
| Croftkey Limited | Information & communication | 2024 |
| Crompton Court Haigh Street RTM Company Limited | Households | 2022 |
| Crompton Family Investments Limited | Professional & scientific | 2020 |
| Crompton Investment Property Limited | Financial services | 2022 |
| Cronshaw Consultancy Services Ltd | Professional & scientific | 2019 |
| Crosby P&S Ltd | Hospitality | 2026 |
| Cross Bay Caravans Limited | Wholesale & retail | 2019 |