| Carterfilms Ltd | Extraterritorial | 2021 |
| Carters Travel Limited | Transport & logistics | 2015 |
| Cascade Property Limited | Construction | 2026 |
| Casi Consulting Limited | Extraterritorial | 2025 |
| Cassandra MK Limited | Wholesale & retail | 2025 |
| Casual Coolness Ltd | Wholesale & retail | 2024 |
| Cat Transport Ltd | Transport & logistics | 2024 |
| Cata & O Trans Ltd | Transport & logistics | 2024 |
| Catalyst Writing Services Ltd | Administrative & support | 2017 |
| Catauta Company Limited | Administrative & support | 2018 |
| Catercare Catering Equipment Limited | Wholesale & retail | 2006 |
| Caterer Careers UK Ltd | Hospitality | 2012 |
| Catlin & Wright Construction Limited | Construction | 2013 |
| Catrin House Limited | Real estate | 2016 |
| Cave's Kitchen Limited | Hospitality | 2023 |
| Caviari Limited | Wholesale & retail | 2026 |
| CB2PLUS Limited | Real estate | 2022 |
| Cbeconstruct Ltd | Construction | 2019 |
| CCA 90 Ltd | Professional & scientific | 2021 |
| CCK Bicycles Ltd | Wholesale & retail | 2016 |
| CCK Cycles Ltd | Extraterritorial | 2015 |
| CCS Technical Engineering Ltd | Professional & scientific | 2018 |
| Cdalexander Limited | Arts & recreation | 2024 |
| CDL Construction Services Limited | Construction | 1998 |
| CDL Installs Ltd | Information & communication | 2022 |
| CDM Builders Ltd | Construction | 2016 |
| CDP Holdings Corporation Limited | Administrative & support | 2021 |
| CEE Kays Estates Ltd | Other services | 2005 |
| Celica Trans Limited | Transport & logistics | 2014 |
| Cematia Ltd | Administrative & support | 2022 |
| Census Accountancy & Business Intelligence Limited | Professional & scientific | 2020 |
| Center for Foreign Studies-Cfs Ltd | Education | 2024 |
| Central Asset Investments Limited | Real estate | 2020 |
| Central Building Property Maintenance Limited | Administrative & support | 2010 |
| Centurion Landscapes & Home Improvements Ltd | Construction | 2023 |
| Centurion Signature Residences Ltd | Real estate | 2026 |
| Century Builders Limited | Construction | 2018 |
| Century Grove (Hitchin) Management Company Limited | Households | 2019 |
| Certsure LLP | | 2012 |
| Ceylon Glamour UK Ltd | Wholesale & retail | 2024 |
| CFC Mechanical Limited | Manufacturing | 2024 |
| CG Carpenter Service Ltd | Construction | 2016 |
| Cgb-Autos Ltd | Wholesale & retail | 2026 |
| CGC OGA (UK) Ltd | Other services | 2026 |
| Chain Driven Limited | Extraterritorial | 2008 |
| Chalk Hill Limited | Real estate | 1986 |
| Chamberlain Holdings Public Limited Company | Financial services | 1983 |
| Chancery Coffee House Limited | Hospitality | 2026 |
| Change Strategy Consultants Ltd | Health & social care | 2025 |
| Chantala Morris Dingle Limited | Extraterritorial | 2026 |
| Chappell Plumbing and Heating Ltd | Construction | 2014 |
| Chargered Limited | Professional & scientific | 2012 |
| Charlee Traders Ltd | Administrative & support | 2020 |
| Charlie Miller Racing Ltd | Arts & recreation | 2009 |
| Charliesprods LP | | 2021 |
| Chascon Care Limited | Health & social care | 2017 |
| Chassis Limited | Administrative & support | 2014 |
| Chauffeur Dynamics Ltd | Transport & logistics | 2023 |
| Chavda Optical Ltd | Health & social care | 2019 |
| Checks and Stripes Limited | Wholesale & retail | 2022 |
| Chefchanss Ltd | Extraterritorial | 2025 |
| Chelmsford Auto Planet Limited | Wholesale & retail | 2010 |
| Chenge’S Catering Services Limited | Hospitality | 2023 |
| Cherish END Catering Limited | Hospitality | 2010 |
| Cherished Estates Ltd | Real estate | 2024 |
| Cherry Hinton Cambridge Limited | Wholesale & retail | 2018 |
| Chestnut GM Company Limited | Households | 2021 |
| Cheungsnests Ltd | Real estate | 2025 |
| Chez Jerome Limited | Hospitality | 2017 |
| Chez Winakabs Europe Publishing Limited | Information & communication | 2015 |
| Chic Clean Limited | Administrative & support | 2023 |
| Chicken Heist Limited | Hospitality | 2025 |
| Chicken N Spudz Corner Limited | Hospitality | 2025 |
| Chicken Pizza Ltd | Hospitality | 2025 |
| Chicky Picky's Ltd | Hospitality | 2025 |
| Chilsted Limited | Manufacturing | 1992 |
| Chiltern Design Limited | Construction | 2011 |
| Chiltern Tyre & Exhaust Limited | Wholesale & retail | 1999 |
| Chippy 66 Limited | Construction | 2019 |
| Chloe’S Castles Limited | Arts & recreation | 2022 |
| Chloker Kitchens Ltd | Manufacturing | 2014 |
| Choicex Group Ltd | Wholesale & retail | 2024 |
| Choir on the Green Ltd | Other services | 2025 |
| Choix Cosmetics Limited | Wholesale & retail | 2019 |
| Choosi Ltd | Professional & scientific | 2026 |
| Choudry Enterprises Limited | Real estate | 2025 |
| CHP Electrical Solutions Ltd | Administrative & support | 2022 |
| Chris Barber Construction Limited | Construction | 2016 |
| Chris R. BEW Limited | Professional & scientific | 2007 |
| Christies Contracts Ltd | Construction | 2019 |
| Christopher Peter Edgar Solutions Ltd | Transport & logistics | 2026 |
| Chronos Limited | Wholesale & retail | 1968 |
| Chrysalis Enterprises Limited | Wholesale & retail | 1992 |
| Church Hill Curry Ltd | Hospitality | 2024 |
| Churchill Computer Supplies Limited | Information & communication | 1976 |
| Cinnamon Xpress Ltd | Hospitality | 2025 |
| Ciobanu Limited | Construction | 2024 |
| Ciocan Flooring Limited | Construction | 2019 |
| CIP Strategies Ltd | Information & communication | 2010 |
| Ciprian Garbea Ltd | Construction | 2019 |