| Cook Food Limited | Extraterritorial | 1994 |
| Cook Kitchens Limited | Extraterritorial | 2004 |
| Cook Pro Limited | Hospitality | 2022 |
| Cook Puddings Limited | Extraterritorial | 2006 |
| Cook Retail Limited | Extraterritorial | 1997 |
| Cook Trading Limited | Manufacturing | 2002 |
| Cookes Car Repairs Limited | Wholesale & retail | 2017 |
| Copper Bottom Investments Limited | Other services | 2016 |
| Copperside Limited | Real estate | 1989 |
| Coral Cabin Ltd | Agriculture & fishing | 2021 |
| Corcoran's Estates Limited | Real estate | 2024 |
| Core FM Ltd | Professional & scientific | 2022 |
| Core Tax Limited | Professional & scientific | 2021 |
| Cornford Jewellers Ltd | Manufacturing | 2020 |
| Cornwall Wardrobes Ltd | Construction | 2018 |
| Corsetbysl Ltd | Manufacturing | 2023 |
| Cosset Limited | Health & social care | 2016 |
| Costa Mobile Homes Limited | Real estate | 2014 |
| Countrystyle Recycling (East) Limited | Extraterritorial | 2004 |
| Countrystyle Recycling Limited | Water & waste | 2004 |
| County Nannies Limited | Administrative & support | 1999 |
| Court House and Commercial Properties Limited | Construction | 1988 |
| Court Mews Cross Lane Management Company Limited | Households | 2023 |
| Courtenay House (Canterbury) Limited | Households | 1993 |
| Courtside Padel Club UK Ltd | Arts & recreation | 2025 |
| Covenant Love People (CLP) | Other services | 2011 |
| Cowstead Ltd | Real estate | 2022 |
| COZ Scrap Metals Ltd | Wholesale & retail | 2025 |
| CPH Property Solutions Ltd | Construction | 2015 |
| Craftymetals Joinery Ltd | Manufacturing | 2025 |
| Creasey Castings Limited | Manufacturing | 1991 |
| Creasey Holdings Limited | Financial services | 2020 |
| Creative Resins International Limited | Extraterritorial | 2017 |
| Creative Resins Ltd | Manufacturing | 1999 |
| Creative Sparrow Ltd | Arts & recreation | 2021 |
| Credcorp Ltd | Financial services | 2025 |
| Credit Limits International Limited | Financial services | 2009 |
| Credx Ltd | Financial services | 2025 |
| Creed Developments Ltd | Construction | 2018 |
| Creek (in Kent) Ltd | Hospitality | 2018 |
| Creek Consulting Ltd | Extraterritorial | 2014 |
| Creek Mill Ltd | Health & social care | 2022 |
| Creepy Claws Centre CIC | Arts & recreation | 2025 |
| Crest Leon Limited | Real estate | 2024 |
| Crestful UK Limited | Real estate | 2015 |
| Criminal Justice Resolutions Ltd | Public administration | 2009 |
| Crispins Fish Bar Limited | Hospitality | 2006 |
| CRM Housing Limited | Real estate | 2025 |
| Crooms Hill Limited | Professional & scientific | 2017 |
| Crown of Glory Ltd | Manufacturing | 2025 |
| Crundale Group Limited | Financial services | 2021 |
| Crusader Packaging Limited | Administrative & support | 1987 |
| Cryn Transport Ltd | Transport & logistics | 2020 |
| Cryptbro Limited | Financial services | 2022 |
| Cryptonfix Limited | Manufacturing | 2013 |
| Crystal Vehicle Remarketing Ltd | Wholesale & retail | 2024 |
| CS Electrical (Electrical Contractors) Limited | Construction | 2003 |
| CS One Design Ltd | Other services | 2014 |
| CS One Holdings Ltd | Other services | 2017 |
| CSS Vehicle Sales Ltd | Wholesale & retail | 2025 |
| CSS Vehicle Services Ltd | Wholesale & retail | 2023 |
| Cssw Investments Limited | Real estate | 2023 |
| CT Associates (Kent) Ltd | Professional & scientific | 2014 |
| CTE Electrical Limited | Construction | 2019 |
| CTH Accounting (Kent) Ltd | Real estate | 2014 |
| Ctjm Supplies Limited | Wholesale & retail | 2017 |
| CTM Services (Kent) Limited | Transport & logistics | 2021 |
| Culverbrook Limited | Professional & scientific | 2020 |
| Culverstone Limited | Administrative & support | 2020 |
| Cunnea Rail Consultants Ltd | Transport & logistics | 2020 |
| Curated Cart Limited | Wholesale & retail | 2025 |
| Curtis Construction and Groundworks Ltd | Construction | 2018 |
| Customs Consultants Ltd | Professional & scientific | 2004 |
| Cutting Edge Graphics Ltd | Manufacturing | 2012 |
| CVG Consultancy Ltd | Professional & scientific | 2021 |
| CWC Automotive Ltd | Wholesale & retail | 2013 |
| Cwce Limited | Professional & scientific | 2025 |
| CWW Project Management Ltd | Professional & scientific | 2023 |
| Cyclops Mechanical Engineering Ltd | Professional & scientific | 2018 |
| Cygnet EAR Care Ltd | Health & social care | 2024 |
| CZD Support Limited | Professional & scientific | 2011 |
| Cànyss Club Ltd | Wholesale & retail | 2026 |
| D & J Lawncare Limited | Administrative & support | 2002 |
| D & R Fabrications Ltd | Manufacturing | 2016 |
| D & S Residential Limited | Real estate | 2019 |
| D Andrews Renovations Limited | Construction | 2025 |
| D Bowles Ltd | Manufacturing | 2016 |
| D J P Holdings Limited | Financial services | 2008 |
| D M Carpentry (South East) Limited | Construction | 2022 |
| D M W Carpentry Ltd | Construction | 2010 |
| D N R Haulage Limited | Transport & logistics | 2016 |
| D Palliser Contractors Ltd | Construction | 2016 |
| D Stancea Transport Limited | Transport & logistics | 2016 |
| D&T Bouncy Castles Ltd | Arts & recreation | 2017 |
| D'Sweet Aroma Foods Ltd | Hospitality | 2026 |
| D'Unique Ltd | Other services | 2024 |
| D. & W. Barling Limited | Professional & scientific | 1971 |
| D. Moule Limited | Construction | 2002 |
| D. Popoola Limited | Professional & scientific | 2021 |
| D.A.S Kent Specialist Cleaning Ltd | Administrative & support | 2025 |