| Castle View Shipping Ltd | Transport & logistics | 2026 |
| Castlemount Court Residents Company Limited | Administrative & support | 1984 |
| Castleside Ltd | Households | 2022 |
| Catalyx Group Ltd | Real estate | 2026 |
| Cate Brothwell Ltd | Professional & scientific | 2024 |
| Catering South MED Ltd | Hospitality | 2018 |
| Cathedral GAS Ltd | Construction | 2023 |
| Catherine Hill Consulting Limited | Information & communication | 2007 |
| CBS Car Sales Limited | Wholesale & retail | 2024 |
| CCS Network (ME) Ltd | Professional & scientific | 2014 |
| CDS Project Management Ltd | Professional & scientific | 2026 |
| Ceallach Investments Ltd | Real estate | 2025 |
| Cels Contracts Limited | Manufacturing | 2014 |
| Central Investigation Agency Limited | Administrative & support | 2023 |
| Centre Business Regist Office Ltd | Extraterritorial | 2011 |
| Centred Care Services Ltd | Health & social care | 2023 |
| Cer-Logistic Limited | Transport & logistics | 2004 |
| Ceramique Unique Limited | Construction | 2024 |
| Cevim Invest Ltd | Extraterritorial | 2015 |
| Cevim Ltd | Arts & recreation | 2015 |
| CF Locations Invest Ltd | Professional & scientific | 2024 |
| Cfdx, Inc. | | 2023 |
| Challenger Scaffolding Limited | Construction | 2016 |
| Challenger Tyre Services Ltd | Wholesale & retail | 2025 |
| Chamar Limited | Professional & scientific | 2007 |
| Chancepixies Animal Welfare Ltd | Other services | 2009 |
| Channel Angling Limited | Wholesale & retail | 2020 |
| Channel Company Consulting Limited | Professional & scientific | 2009 |
| Channel Engineering Limited | Construction | 2008 |
| Channel Fabrications Limited | Manufacturing | 2012 |
| Channel Facilities Management Limited | Other services | 2014 |
| Channel FM Cleaning & Support Services Ltd | Administrative & support | 2026 |
| Channel Health Alliance Limited | Health & social care | 2017 |
| Channel Legal Ltd | Professional & scientific | 2026 |
| Channel Marine Surveys Limited | Transport & logistics | 2025 |
| Channel Tunnel Service Ltd | Wholesale & retail | 2020 |
| Channels and Choices Therapeutic Fostering Limited | Public administration | 2013 |
| Charcuterie and Cheddar Ltd | Hospitality | 2025 |
| Charles Michael Investments Ltd | Financial services | 2025 |
| Charlotte Hyde Limited | Information & communication | 2014 |
| Charlton Dour Limited | Households | 2007 |
| Charlton Green Limited | Households | 2005 |
| Charlton House (Dover) Ltd | Real estate | 2021 |
| Charlton Trading Ltd | Wholesale & retail | 2022 |
| Charmaine Organisation Ltd | Other services | 2025 |
| Chartham Treeworks Limited | Agriculture & fishing | 2001 |
| Cheap Lemonade Ltd. | Wholesale & retail | 2024 |
| Chelsea Living Ltd | Manufacturing | 2018 |
| Chelsea Manor Studios Limited | Real estate | 2019 |
| Cherry Hill Court Management Company Limited | Households | 2020 |
| Cherry Tree Garage Ltd | Wholesale & retail | 2025 |
| Cherry Tree Mews Limited | Households | 2015 |
| Chez Katty Invest Ltd | Extraterritorial | 2022 |
| Chez Katty Ltd | Extraterritorial | 2025 |
| Chez Pat's Invest Ltd | Professional & scientific | 2024 |
| Chez Pat's Ltd | Extraterritorial | 2024 |
| Chives Catering Limited | Hospitality | 1998 |
| Chloe-Jo Limited | Transport & logistics | 2025 |
| Chris Hunt Plumbing and Heating Limited | Construction | 2025 |
| Christie Wealth Ltd | Financial services | 2012 |
| Chronolap Ltd | Administrative & support | 2025 |
| Chunnel Plant Hire and Contractors Limited | Construction | 1973 |
| Church Farm Mews Management Company Limited | Households | 2008 |
| Churchill Court Dover RTM Company Ltd | Households | 2025 |
| Cilec Limited | Real estate | 2003 |
| Cinque Ports Construction Ltd | Construction | 2019 |
| Cioffi Importers Limited | Wholesale & retail | 2008 |
| Citadel Grounds Maintenance Ltd | Administrative & support | 2023 |
| Citadel Road Management Limited | Households | 2007 |
| Cititeam International Limited | Construction | 2019 |
| CJ Fresh Cleaning Limited | Administrative & support | 2023 |
| CJ Mortgages Ltd | Financial services | 2021 |
| CJH Technical Solutions Limited | Information & communication | 2014 |
| CJJ Building Ltd | Construction | 2026 |
| CJJ Construction Limited | Extraterritorial | 2019 |
| CK Civils & Utilities Ltd | Construction | 2018 |
| CK Skips Limited | Water & waste | 2021 |
| CKS Healthcare Limited | Health & social care | 2018 |
| Clairvoyant Collective Limited | Other services | 2021 |
| Claremont Scientific Consultancy Limited | Administrative & support | 2024 |
| Clarence Lodge (Deal) Management Company Ltd | Households | 2005 |
| Clarkewrights Mobility Limited | Wholesale & retail | 2023 |
| Class II Supplies Limited | Wholesale & retail | 2001 |
| Classic Garage Doors (Kent) Limited | Construction | 2009 |
| Clear FR8 (Bradford) Global Forwarding Limited | Transport & logistics | 2025 |
| Clear FR8 (Heathrow) Limited | Transport & logistics | 2023 |
| Clear FR8 (Manchester) Limited | Transport & logistics | 2022 |
| Clear FR8 (Midlands) Limited | Transport & logistics | 2023 |
| Clear FR8 Limited | Transport & logistics | 2017 |
| Clear FR8 Properties Limited | Real estate | 2024 |
| Clear FR8 Transport Limited | Transport & logistics | 2022 |
| Clever Cost Ltd | Professional & scientific | 2025 |
| Clinical Services Plus Ltd | Health & social care | 2023 |
| Cloke Developments Limited | Construction | 2025 |
| Cloudfirst Technologies Corporation | | 2024 |
| CLR Family Ltd | Wholesale & retail | 2022 |
| Clubsocial Inc | | 2023 |
| Cluff & Sons Ltd | Other services | 2016 |
| Clutch Audio Limited | Information & communication | 2024 |
| CMM HR Limited | Professional & scientific | 2004 |