| Crayford Motors Limited | Real estate | 1960 |
| Craylands Lane Management Limited | Hospitality | 1990 |
| Creatade Ltd | Professional & scientific | 2017 |
| Create Building Solutions Ltd | Construction | 2021 |
| Createdbyfeyi Limited | Information & communication | 2025 |
| Creative Building Services Ltd | Construction | 2019 |
| Creative Solutions Psychology C.I.C. | Health & social care | 2020 |
| Creative Technical Collective Ltd | Professional & scientific | 2023 |
| Creative Thinking Printing Services Limited | Manufacturing | 2013 |
| Creatside Limited | Construction | 1975 |
| Credence Direct Ltd | Information & communication | 2020 |
| Credence Direct Properties Ltd | Real estate | 2022 |
| Credit Hire Limited | Administrative & support | 2019 |
| Crescent (Castle ROW) Management Company Limited(The) | Households | 1986 |
| Crest & Pillar Ltd | Manufacturing | 2026 |
| Crestdale Properties Limited | Financial services | 2024 |
| Crew Residency Limited | Real estate | 2024 |
| Crispy Buns Ltd | Hospitality | 2021 |
| Crispy Waffle Harlow Ltd | Wholesale & retail | 2021 |
| Critical Engineering Solutions Ltd | Construction | 2019 |
| CRK Limited | Information & communication | 2024 |
| CRN Trans Ltd | Transport & logistics | 2019 |
| Croder Ltd | Professional & scientific | 2016 |
| Croftbond Group Ltd | Financial services | 2025 |
| Croftbond Holdings Ltd | Real estate | 2025 |
| Croplinq Limited | Wholesale & retail | 2020 |
| Crossbridge Solutions Ltd | Professional & scientific | 2024 |
| Crossways Storage Ltd | Transport & logistics | 2024 |
| Crown ARK Properties Limited | Real estate | 2023 |
| Crown Business Ltd | Administrative & support | 2023 |
| Crown Civil Engineering (UK) Ltd | Construction | 2012 |
| Crown Concrete Group Ltd | Construction | 2013 |
| Crown Concrete Services Ltd | Construction | 2023 |
| Crown House Coffee Ltd | Hospitality | 2026 |
| Crown Industrial Doors Limited | Manufacturing | 2013 |
| Crown Reactive Property Maintenance Limited | Manufacturing | 2020 |
| Crown Roofing & Property Maintenancece Ltd | Construction | 2019 |
| Crown Services (Kent) Ltd | Real estate | 2015 |
| Crownstone Consultancy Limited | Information & communication | 2024 |
| Crownway Rental Services Limited | Administrative & support | 2026 |
| Cruden Road 1955 Limited | Extraterritorial | 2015 |
| Crypto Inc Ltd | Financial services | 2021 |
| Crystal AID Limited | Construction | 2025 |
| Crystal Clear Vision Limited | Information & communication | 2004 |
| Crystal Kidz Childcare Ltd | Health & social care | 2021 |
| Crystalclear Cleaners Limited | Administrative & support | 2014 |
| CS Collection Service Limited | Administrative & support | 2024 |
| CSB Hub Ltd | Financial services | 2023 |
| CSB Management Consultancy Ltd | Professional & scientific | 2007 |
| CSL Installations Holdings Limited | Professional & scientific | 2006 |
| CSL Power Systems Ltd | Manufacturing | 2000 |
| CSM Contractors Ltd | Construction | 2026 |
| Csrt Investment Ltd | Real estate | 2024 |
| CSS Civils Limited | Construction | 2019 |
| CT Digital Services Ltd | Wholesale & retail | 2023 |
| CT Kent Interiors Ltd | Construction | 2022 |
| Cube Group Training Limited | Education | 2016 |
| Cucorada Construction Ltd | Construction | 2025 |
| Cuppiecups Ltd | Hospitality | 2019 |
| Cura Physiotherapy Limited | Health & social care | 2025 |
| Current Direction Facilities Management Ltd | Construction | 2025 |
| Current Direction Fire Solutions Limited | Construction | 2023 |
| Curry Gravesend Ltd | Hospitality | 2024 |
| Curry Mecca Ltd | Hospitality | 2026 |
| Curry Ways Ltd | Hospitality | 2019 |
| Curva Design Office Ltd | Professional & scientific | 2026 |
| Custody Lens Limited | Information & communication | 2026 |
| Cuxton Developments Limited | Extraterritorial | 2002 |
| Cuxton Surveying Consultancy Limited | Professional & scientific | 2013 |
| CV8D Ltd | Real estate | 2022 |
| CVG Transport Ltd | Transport & logistics | 2022 |
| CVL Management Limited | Administrative & support | 2020 |
| Cwdit Limited | Information & communication | 2015 |
| CWR Plant Hire & Groundworks Ltd | Construction | 2019 |
| CYC Properties Management Limited | Real estate | 2025 |
| Cyclopark | Arts & recreation | 2011 |
| Cygnus Construction Ltd | Construction | 2016 |
| Cyrus Residential Care Consultancy Limited | Professional & scientific | 2026 |
| D & a Consultancy Limited | Information & communication | 2025 |
| D & a Windows & Conservatories Ltd | Construction | 2008 |
| D & B Studio Limited | Wholesale & retail | 2000 |
| D & G Healthcare PVT Ltd | Wholesale & retail | 2021 |
| D & S Estate Limited | Real estate | 2014 |
| D a Stacey Ltd | Construction | 2012 |
| D and J Electrical Services Limited | Construction | 2016 |
| D C Hardy Ltd. | Information & communication | 2015 |
| D G Bruce & SON Limited | Real estate | 2000 |
| D Mcdermott Ltd | Professional & scientific | 2003 |
| D Mcgill Limited | Hospitality | 2014 |
| D N Holland Limited | Extraterritorial | 2013 |
| D P Brickwork Contractors Limited | Construction | 2008 |
| D R a Lumsden Ltd | Professional & scientific | 2020 |
| D R Car Repairs (South East) Ltd | Wholesale & retail | 2023 |
| D Recruitment Group Ltd | Transport & logistics | 2019 |
| D to E Property Solutions Ltd | Real estate | 2024 |
| D&A Project Management Ltd | Construction | 2024 |
| D&C Global Ltd | Transport & logistics | 2021 |
| D&G Drainage Solutions Limited | Construction | 2013 |
| D&I Drylining Ltd | Construction | 2016 |
| D&Mg Ltd | Hospitality | 2021 |