| Carslake Property Limited | Real estate | 2023 |
| Castledene Amey Holdings Limited | Financial services | 2021 |
| Castledene Motor Company Limited | Wholesale & retail | 1987 |
| Cave Direct North Ltd. | Wholesale & retail | 2014 |
| Caveswood Limited | Wholesale & retail | 1996 |
| CAX Property Ltd | Real estate | 2021 |
| CAX Property Management Limited | Real estate | 2024 |
| CDI UK Global Limited | Administrative & support | 2020 |
| CDP Air Services Limited | Manufacturing | 2022 |
| Celestine Holistic Ltd | Health & social care | 2025 |
| Century Roofing & Building Ltd | Construction | 2026 |
| Ceramaro Limited | Manufacturing | 2025 |
| Cerebellum Assoc. Limited | Administrative & support | 2015 |
| Chamberlain Consultants Ltd | Construction | 2023 |
| Chaney Investments (Joy Lane) Limited | Construction | 2016 |
| Chant Property Holdings Ltd | Administrative & support | 2022 |
| Chapelton Group Ltd | Financial services | 2015 |
| Charcuterie Limited | Manufacturing | 2022 |
| Charles & Associates Consulting Engineers Ltd | Construction | 2012 |
| Charles & Associates EOT Limited | Administrative & support | 2023 |
| Cheapcoffeesupplies.Com Limited | Hospitality | 2021 |
| Cherubs Pre-School Ltd | Health & social care | 2026 |
| Chesed Ltd | Information & communication | 2026 |
| Chiplime (Construction) Limited | Construction | 1985 |
| Chiplime Construction Services Limited | Construction | 2002 |
| Chirovet Kent Limited | Professional & scientific | 2019 |
| Cities Ideal Ltd | Professional & scientific | 2023 |
| CJA Enterprises Limited | Administrative & support | 2016 |
| CKH Steel Ltd | Manufacturing | 2017 |
| Ckscott Limited | Administrative & support | 2020 |
| Clare Sore Consultancy Limited | Health & social care | 2023 |
| Clark Webb Ltd | Construction | 2025 |
| Clear Skin Laser Treatments Limited | Health & social care | 2019 |
| Clements Plant & Tool Hire Limited | Construction | 1965 |
| Clever Vending Company Ltd | Hospitality | 2015 |
| Clubb Properties Ltd | Real estate | 2018 |
| CMX Heritage Construction Ltd | Construction | 2023 |
| Co Ordinated Contracts Mechanical Ltd | Construction | 2019 |
| Coast to Coast Business Solutions Ltd | Professional & scientific | 2022 |
| Cobnut Farm Limited | Agriculture & fishing | 2022 |
| CODE4 Digital Ltd | Information & communication | 2026 |
| Cognitive Labs Limited | Information & communication | 2012 |
| Cognitive Labs Platforms Limited | Information & communication | 2025 |
| Collins Harris Ltd | Professional & scientific | 2019 |
| Coming Home to Your Truth CIC | Other services | 2025 |
| Commerapp Ltd | Wholesale & retail | 2024 |
| Commercial & Domestic Boiler Spares Ltd | Wholesale & retail | 2015 |
| Commercial Leisure Services LLP | | 2017 |
| Commercial Leisure Supplies Limited | Other services | 2007 |
| Community Agribusiness Partners | Other services | 2023 |
| Comp Developments Limited | Construction | 2021 |
| Comparison Works Ltd | Information & communication | 2015 |
| Compass Express Services Limited | Professional & scientific | 2003 |
| Complete Home Care Kent Limited | Health & social care | 2023 |
| Comsec Products Limited | Administrative & support | 1998 |
| Cooper Clarke Construction Limited | Construction | 1996 |
| Cooper Clarke Education and Health Care Services Limited | Construction | 2012 |
| Cooperdaly Solutions and Support LLP | | 2016 |
| Copper Tree Designs Ltd | Professional & scientific | 2021 |
| Corbens Place Limited | Real estate | 1991 |
| Corporate Entertainment Agency Limited | Arts & recreation | 2017 |
| Corringham Investments Limited | Real estate | 2002 |
| Counters Contractors Ltd | Administrative & support | 2024 |
| Country House Estates Limited | Administrative & support | 2019 |
| Country House Homes Heathlands Ltd | Professional & scientific | 2019 |
| Country House Homes Limited | Professional & scientific | 2013 |
| County Contracts Ltd | Construction | 2026 |
| Coventina Coaching Ltd | Professional & scientific | 2023 |
| COX Consultants Ltd | Construction | 2024 |
| Cracking 120 Ltd | Construction | 2016 |
| Craig Webster Limited | Information & communication | 2025 |
| Created by Air Ltd | Transport & logistics | 2020 |
| Creative Quarry Ltd | Information & communication | 2023 |
| Crosshawk Properties Ltd | Real estate | 2026 |
| Crown Woods Finance Limited | Financial services | 1998 |
| Ctfiregroup Ltd | Public administration | 2020 |
| CTS #41 Motorsport Ltd | Wholesale & retail | 2022 |
| Cubed Business Development Limited | Professional & scientific | 2020 |
| Cupcake Creation Ltd | Manufacturing | 2015 |
| Curious COW Events Ltd | Hospitality | 2019 |
| Custom Villas Limited | Real estate | 1985 |
| CVH Golf Limited | Wholesale & retail | 2023 |
| Cvpapa Ltd | Transport & logistics | 2025 |
| Cynosure Film Limited | Information & communication | 2016 |
| D & B Facilities Management Limited | Administrative & support | 2004 |
| D & C Enterprise Solutions Limited | Administrative & support | 2015 |
| D & J Communications Limited | Information & communication | 2004 |
| D & S LEE Ltd | Health & social care | 2019 |
| D K Sanders Limited | Administrative & support | 2019 |
| D. C. Hudson & Partner LLP | | 2015 |
| D. W. Allground Limited | Construction | 2015 |
| D.H.J. Mercer & Sons Limited | Real estate | 1956 |
| Daisy Lily Limited | Manufacturing | 2022 |
| DAL Finance & Mortgage Brokers Limited | Financial services | 2007 |
| Dale James Contractors Limited | Construction | 2025 |
| DAN International (UK) Limited | Wholesale & retail | 1995 |
| Daniel F Hussey Limited | Professional & scientific | 2023 |
| Daniel Gould Construction Ltd | Construction | 2023 |
| Danload Stacking Systems Limited | Manufacturing | 2016 |
| Dargate Developments Limited | Construction | 2021 |