| Conservatory Valet UK Ltd | Administrative & support | 2018 |
| Constantine Construction Company (Medway) Limited | Construction | 1993 |
| Constantine the Great Limited | Other services | 2018 |
| Construction 4S Limited | Construction | 2012 |
| Construction Capabilities Ltd | Construction | 2024 |
| Construction Solutions Management South Ltd | Construction | 2018 |
| Consult Design & Construct Ltd | Construction | 2025 |
| Consultancy Plus Global Limited | Professional & scientific | 2000 |
| Consulting Mljc Ltd | Other services | 2018 |
| Contin Holdings Limited | Households | 2021 |
| Continental Properties Limited | Real estate | 2021 |
| Contract Core Consultancy Limited | Professional & scientific | 2024 |
| Converter Tech Limited | Information & communication | 2021 |
| Cool Space ACR Ltd. | Construction | 2011 |
| Cooling Castle Barn Limited | Hospitality | 1998 |
| Cooling Castle Barn Research LLP | | 2009 |
| Coombs of Medway Limited | Wholesale & retail | 2009 |
| Coopers Arms (Kent) Limited | Hospitality | 2007 |
| Copia Digital Ltd | Information & communication | 2005 |
| Copia Events Ltd | Administrative & support | 2015 |
| Copper Nest Limited | Real estate | 2025 |
| Copperclad Ltd | Construction | 2018 |
| Coppermoth Ltd | Professional & scientific | 2015 |
| Coralbay Limited | Hospitality | 2012 |
| Cordice Ltd | Public administration | 2025 |
| Core ACS Limited | Administrative & support | 2017 |
| Core Finance Management Limited | Administrative & support | 2017 |
| Core Invoicing Solutions Ltd | Administrative & support | 2017 |
| Core JIU Jitsu Ltd | Education | 2025 |
| Core Management Group Limited | Financial services | 2017 |
| Core-Consult-Uk Ltd | Construction | 2024 |
| Corelabs Solutions Limited | Information & communication | 2025 |
| Corevia Limited | Information & communication | 2025 |
| Cornea Cleaning Ltd | Administrative & support | 2022 |
| Cornershopvending Ltd | Extraterritorial | 2024 |
| Cornerstone City Church | Other services | 2012 |
| Cornerstone Consultancy Ltd | Administrative & support | 2009 |
| Cornerstone Home Builders Ltd | Real estate | 2026 |
| Corporate Growth Ltd | Professional & scientific | 2012 |
| Corporate Worship and Training Limited | Education | 2011 |
| Costless Grocers Ltd | Wholesale & retail | 2025 |
| Coulter Utilities Ltd | Construction | 2023 |
| Country House Cars Ltd | Wholesale & retail | 2026 |
| Countrywide Services Limited | Professional & scientific | 2018 |
| County Enforcement Limited | Administrative & support | 2013 |
| County Lettings Limited | Real estate | 1999 |
| County Property & Facility Maintenance Limited | Extraterritorial | 2025 |
| County Security Limited | Administrative & support | 2022 |
| Countybay Limited | Real estate | 2003 |
| Cova Group Ltd | Other services | 2024 |
| Covariance Communications Ltd | Professional & scientific | 2024 |
| Coventgate Law Ltd | Professional & scientific | 2017 |
| Covesfield Ltd | Information & communication | 2009 |
| Cozy Quest Ltd | Wholesale & retail | 2026 |
| CPF Electrical Services Limited | Construction | 2017 |
| Cpme Ltd | Real estate | 2016 |
| CPN Electrical Limited | Energy | 2023 |
| CPP Limited | Administrative & support | 1999 |
| CPR Solutions Limited | Wholesale & retail | 2000 |
| CQ Enterprises Limited | Hospitality | 2023 |
| CQ Housing Ltd | Real estate | 2024 |
| CR Rayfield Electrical Ltd | Construction | 2025 |
| Cracked Repairs Limited | Manufacturing | 2013 |
| Craft Works Joinery Ltd | Construction | 2013 |
| Cramer Events Ltd | Wholesale & retail | 2018 |
| Crane Brickwork Limited | Construction | 2022 |
| Cravencroft Limited | Other services | 2009 |
| Craxton Corcoran Limited | Agriculture & fishing | 2022 |
| Crazy Nails Ltd | Other services | 2024 |
| Create Relate Ltd | Professional & scientific | 2019 |
| Creative Signage Solutions Ltd | Professional & scientific | 2019 |
| Creative Tree Arts and Crafts C.I.C. | Education | 2015 |
| Creativefurniturestudio Ltd | Construction | 2026 |
| Creme Estates Limited | Real estate | 2023 |
| Crestview Holdings Limited | Real estate | 2024 |
| Crewgo Ltd | Information & communication | 2026 |
| Crewsader Brickwork Limited | Extraterritorial | 2022 |
| Crfservices Ltd | Construction | 2025 |
| Crhia Limited | Health & social care | 2019 |
| Crispe Construction Ltd | Construction | 2019 |
| Crispin Management Limited | Administrative & support | 2018 |
| Crittendens Accountants Ltd | Professional & scientific | 2021 |
| CRJ Decorations Ltd | Construction | 2021 |
| CRM Partner Solutions Ltd | Information & communication | 2025 |
| Croc Sauce Ltd | Wholesale & retail | 2023 |
| Crofthawk Associates Ltd | Financial services | 2005 |
| Cross Park Cafe Limited | Hospitality | 2024 |
| Cross-Border Social Work Group Ltd | Health & social care | 2025 |
| Crossley HR Holdings Ltd | Financial services | 2023 |
| Crossley Payroll Limited | Professional & scientific | 2000 |
| Crossley Property and Lettings Limited | Professional & scientific | 2017 |
| Crossley Tax Limited | Professional & scientific | 2011 |
| Crossways Builders Yard Ltd | Wholesale & retail | 2023 |
| Crow Corner Residents' Association Limited | Households | 1997 |
| Crow Lane Management Co Ltd | Households | 2005 |
| Crtvcntrl Ltd | Wholesale & retail | 2026 |
| Crusader Scaffold Ltd | Construction | 2026 |
| Cruz & Co - Property Ltd | Real estate | 2026 |
| Crypto Bosses Ltd. | Information & communication | 2017 |
| Crystal Vault Ltd | Wholesale & retail | 2025 |