| Courtwood Investments Limited | Construction | 2023 |
| Courtyard Associates Limited | Information & communication | 2016 |
| Courtyard Mews Holbury Limited | Construction | 2023 |
| Covalent Capital Ltd | Financial services | 2022 |
| Covalent Dynamics Ltd | Financial services | 2021 |
| Covalent Real Estate I Limited | Real estate | 2026 |
| Cover to Cover Limited | Arts & recreation | 2025 |
| Covrd Limited | Financial services | 2023 |
| Cowdreys 1970 Limited | Extraterritorial | 2015 |
| Cowling Systems Limited | Construction | 2020 |
| Coxicon Limited | Professional & scientific | 2017 |
| CPB Partners LLP | | 2011 |
| CPS Property Maintenance Limited | Construction | 2013 |
| CR & AR Nicholls Limited | Wholesale & retail | 2012 |
| Craft & Science Limited | Administrative & support | 2020 |
| Craftbetterco Ltd | Information & communication | 2026 |
| Cranbrook Physiotherapy and Sports Injury Clinic Limited | Other services | 2019 |
| Crane IT Consulting Limited | Information & communication | 2015 |
| Crave Hospitality Limited | Hospitality | 2019 |
| Crays Hill (Stratstone) Limited | Professional & scientific | 2025 |
| Creams Factory Limited | Wholesale & retail | 2016 |
| Creative Blaze Limited | Arts & recreation | 2021 |
| Creative Coaching Limited | Professional & scientific | 2011 |
| Creative Development Solutions Ltd | Construction | 2025 |
| Creative EYE Digital Limited | Information & communication | 2009 |
| Credence Health Limited | Extraterritorial | 2009 |
| Creditforce Limited | Financial services | 1978 |
| Creed Coaching and Consulting Limited | Administrative & support | 2016 |
| Creese's Creations Limited | Other services | 2006 |
| Crescent Oncology Limited | Health & social care | 2026 |
| Crescom Partners Limited | Real estate | 2021 |
| Cricket Club Development Limited | Arts & recreation | 2021 |
| Crispy Chips Tonbridge Limited | Hospitality | 2022 |
| Critical Insights Ltd | Professional & scientific | 2020 |
| Crittenden Estates Limited | Construction | 2014 |
| Crooklets LLP | | 2016 |
| Cross Shoot Ltd | Information & communication | 2001 |
| Crouches Orchard Borderers Limited | Households | 2003 |
| Crowborough Builders' Supplies Limited | Construction | 1964 |
| Crowded OUT Limited | Information & communication | 2019 |
| Crowhill Advisers Limited | Professional & scientific | 2014 |
| Crown (PMS) Ltd | Information & communication | 2006 |
| Crown Acres Group Ltd | Real estate | 2025 |
| Crown Optical Ltd | Wholesale & retail | 2019 |
| CRS Complete Roofing Solutions Ltd | Construction | 2025 |
| CRS Project Management Limited | Information & communication | 2013 |
| Crush Build Limited | Construction | 2020 |
| Crutch Brothers Limited | Transport & logistics | 2009 |
| Crutch Brothers Removals and Storage Limited | Transport & logistics | 2009 |
| Crystal Cars London Limited | Wholesale & retail | 2019 |
| Crystal Health and Care Limited | Administrative & support | 2024 |
| CS Properties (South East) Ltd | Construction | 2021 |
| CSA Associates Limited | Professional & scientific | 2014 |
| CSP Specialists Ltd | Wholesale & retail | 2016 |
| CTB Maison London Ltd | Construction | 2025 |
| Ctech IT Solutions Ltd | Information & communication | 2017 |
| CTU Contracts Ltd | Information & communication | 2011 |
| Cuizines Limited | Hospitality | 2017 |
| Cullen Estates Limited | Real estate | 1999 |
| Culpepper Trading Limited | Other services | 2009 |
| Culverden Investment Ltd | Administrative & support | 2017 |
| Cumberland Court (Tonbridge) Residents Limited | Hospitality | 2005 |
| Cupitor Limited | Information & communication | 2013 |
| Curelity Healthcare Limited | Administrative & support | 2024 |
| Curiosity Learning Ltd | Education | 2016 |
| Curious Signs & Print Limited | Manufacturing | 2026 |
| Curley Lamont Ltd | Real estate | 2024 |
| Curlover Limited | Administrative & support | 1989 |
| Currency Data Services Limited | Information & communication | 2006 |
| Currowcordal Ltd | Health & social care | 2023 |
| Curry and Splice Ltd | Information & communication | 2010 |
| Curtains at Dawn Limited | Manufacturing | 2021 |
| Curzon Assets Limited | Real estate | 1996 |
| Custom Access Solutions Limited | Construction | 2019 |
| Customer Growth Studio Ltd | Professional & scientific | 2025 |
| Cuvée Card Ltd | Information & communication | 2025 |
| CW Commercial Kitchens Limited | Manufacturing | 2025 |
| Cweeden Ltd | Construction | 2025 |
| Cyber Information Assurance Ltd | Information & communication | 1999 |
| Cybersmile Trading Limited | Administrative & support | 2013 |
| Cybinity Limited | Information & communication | 2025 |
| D & M Finance Limited | Financial services | 2005 |
| D and R Pike Crane Hire Limited | Construction | 1977 |
| D Brannan Limited | Construction | 2013 |
| D E Cars Limited | Wholesale & retail | 2004 |
| D E Trustees Limited | Administrative & support | 2001 |
| D Lewis Investments Ltd | Real estate | 2022 |
| D P Systems Limited | Other services | 2000 |
| D P Webster Ltd | Health & social care | 2021 |
| D Scott Property Limited | Real estate | 2021 |
| D Y S (London) Ltd | Real estate | 2024 |
| D&A Consultancy Services Limited | Professional & scientific | 2025 |
| D&G Forestry and Fencing Limited | Agriculture & fishing | 2019 |
| D&G Restaurant Limited | Hospitality | 2017 |
| D&J Property Solutions Limited | Real estate | 2017 |
| D. & M. Construction Limited | Construction | 1979 |
| D. H. Property Maintenance Ltd | Real estate | 2005 |
| D.A Mechanicals Ltd | Construction | 2023 |
| D.G.M Building and Carpentry Ltd | Construction | 2022 |
| D.K. Holdings Limited | Manufacturing | 1959 |