| Churchills (UK) Ltd | Construction | 2000 |
| City and Coastal Limited | Wholesale & retail | 2015 |
| City Building Network Ltd | Construction | 2019 |
| CJ Design & Build Ltd | Construction | 2014 |
| CJB Services Community Interest Company | Health & social care | 2024 |
| Cjsj Ltd | Real estate | 2021 |
| Claim Your Refund Ltd | Financial services | 2024 |
| Classic Motor and Music Ltd | Arts & recreation | 2018 |
| Clean UP Clear IT Limited | Administrative & support | 2024 |
| Clear Crystal Clean Ltd | Administrative & support | 2022 |
| Clicks Group Ltd | Wholesale & retail | 2022 |
| Climate Change Transformation Limited | Professional & scientific | 2021 |
| Climb Investments Ltd | Real estate | 2020 |
| Clinical Vendor Compare Limited | Information & communication | 2026 |
| Clive West Consulting Limited | Administrative & support | 2013 |
| Clubcarp Ltd | Wholesale & retail | 2020 |
| CM Academy Limited | Other services | 2023 |
| Coast & Country 2020 Limited | Wholesale & retail | 2020 |
| Coast and Country 2006 Limited | Wholesale & retail | 2006 |
| Coast and Crumble Ltd | Hospitality | 2026 |
| Coast Coffee House Ltd | Hospitality | 2025 |
| Cobnuts Woodland Nursery and Forest School Limited | Education | 2014 |
| Cobwell Scaffolding Limited | Construction | 2014 |
| Coconut Tree Noodle Bar Ltd | Hospitality | 2013 |
| Cold-Air Refrigeration Ltd. | Construction | 1998 |
| Colin Sherlock Photography Limited | Professional & scientific | 2024 |
| Colmac Marine Limited | Administrative & support | 1998 |
| Colours Productions Limited | Arts & recreation | 2011 |
| Combined Framemakers Limited | Manufacturing | 1996 |
| Comins Physiotherapy Ltd | Health & social care | 2019 |
| Command Stone Limited | Professional & scientific | 2015 |
| Community Business Hub CIC | Administrative & support | 2018 |
| Community Counselling Service (Kent) CIC | Health & social care | 2012 |
| Community Driving School C.I.C. | Education | 2017 |
| Company of Astrologers Ltd | Information & communication | 2021 |
| Compassure Ltd | Information & communication | 2020 |
| Complete Air Conditioning (South East) Limited | Construction | 2015 |
| Complete Bathrooms South East Limited | Wholesale & retail | 2005 |
| Complete Estate Agents Kent Ltd | Real estate | 2024 |
| Complete Property Compliance Ltd | Households | 2024 |
| Connect and Thrive CIC | Other services | 2022 |
| Connetere Ltd. | Administrative & support | 2003 |
| Considerate Urbanism Ltd | Professional & scientific | 2022 |
| Consumable Solutions Kent Ltd | Wholesale & retail | 2015 |
| Contrast Property Lettings Limited | Real estate | 2006 |
| Coolectric Limited | Extraterritorial | 1984 |
| Corruption Control Limited | Extraterritorial | 2011 |
| Cosmopolitan Events Limited | Arts & recreation | 2014 |
| County Electrical Supplies Limited | Wholesale & retail | 2017 |
| Covenant Mission Care Ltd | Health & social care | 2020 |
| Cowie & Co. Vets Ltd | Professional & scientific | 2026 |
| Cozo Holdings Ltd | Financial services | 2026 |
| CPS Heating & Plumbing Contractors Ltd | Construction | 2007 |
| CR Security Solutions Ltd | Financial services | 2025 |
| Craft Landscapes and Fencing Ltd | Administrative & support | 2023 |
| Craig Partnership Ltd | Professional & scientific | 2021 |
| Cray Building Services Limited | Manufacturing | 2001 |
| Create Homes Kent Ltd | Administrative & support | 2016 |
| Creative Living UK Limited | Construction | 2009 |
| Creatstudio Ltd | Manufacturing | 2011 |
| Cressex Properties Limited | Real estate | 2024 |
| Crest Matrix Limited | Information & communication | 2025 |
| Cricket Pavilion Development Limited | Extraterritorial | 2016 |
| Crimson Graphics Limited | Professional & scientific | 2025 |
| Crockett House Herne Bay Management Limited | Households | 2017 |
| Crofts Houses Ltd | Real estate | 2024 |
| Cross Stroke Limited | Professional & scientific | 2015 |
| Crossley & Davis Limited | Professional & scientific | 2009 |
| Crouch Estates Limited | Real estate | 2020 |
| Crown Construction (Kent) Limited | Construction | 2019 |
| Crown Products (Kent) Limited | Manufacturing | 1986 |
| Crumala Ltd | Information & communication | 2011 |
| CTW Services Limited | Administrative & support | 2009 |
| Cube Hair Designs Limited | Other services | 2006 |
| Curtis Wood Combustion Limited | Construction | 2018 |
| Cutpurse Creative Ltd | Arts & recreation | 2022 |
| CWW Accountants Limited | Professional & scientific | 2014 |
| CWW Secretarial Services Limited | Administrative & support | 2016 |
| Cycle Fixit Limited | Wholesale & retail | 2005 |
| CYJ Developments Limited | Construction | 2025 |
| CZ Plumbing and Heating Ltd | Construction | 2020 |
| CZN Property Limited | Real estate | 2020 |
| D & S Construction (UK) Limited | Construction | 2019 |
| D and T Fire and Security Limited | Administrative & support | 2023 |
| D M Bookkeeping Ltd | Professional & scientific | 2012 |
| D Ryan Solutions Ltd | Construction | 2016 |
| D&N Property Ltd | Construction | 2019 |
| D.B. Home Improvements (Southeast) Limited | Construction | 2004 |
| DA Boss Bunka Ltd | Wholesale & retail | 2022 |
| DAC Mitchell Consulting Ltd | Information & communication | 2024 |
| DAG Group Solution Ltd | Construction | 2020 |
| DAN Rail Limited | Construction | 2015 |
| Daniel JAY Payne Ltd | Extraterritorial | 2021 |
| Darby Couriers Limited | Transport & logistics | 2011 |
| Dark Edge Automotive Ltd | Wholesale & retail | 2025 |
| Dark Ventures Limited | Arts & recreation | 2014 |
| Dartford Living Limited | Information & communication | 2015 |
| Data-Driven Investments Ltd | Real estate | 2023 |
| Dataset Media Limited | Information & communication | 2008 |
| Dataviz BI Ltd | Information & communication | 2022 |