| Christ Trim Ltd | Hospitality | 2014 |
| Christey Clover Ltd | Arts & recreation | 2013 |
| Christey Clover R1 Ltd | Arts & recreation | 2020 |
| Christopher Barry Limited | Extraterritorial | 1995 |
| Chromatic Cars UK Ltd | Wholesale & retail | 2023 |
| Chromology Ltd | Professional & scientific | 2016 |
| Chrysolite Pharma Limited | Health & social care | 2023 |
| Churchill Housing Real Estate (Chre) Limited | Real estate | 2020 |
| CIH Surveying Ltd | Professional & scientific | 2023 |
| Circular Assets Ltd | Wholesale & retail | 2025 |
| City Hand Car Wash Gills Ltd | Administrative & support | 2026 |
| City View Capital Ltd | Real estate | 2023 |
| City View Developments Limited | Real estate | 2019 |
| City View Group Ltd | Real estate | 2023 |
| Ciupi Ltd | Transport & logistics | 2017 |
| Civils & Infrastructure Services Limited | Construction | 2026 |
| CJ Architect Ltd | Professional & scientific | 2020 |
| CJ Kent Foods Ltd | Hospitality | 2024 |
| Cjac Steel Solutions Ltd | Construction | 2024 |
| CJB Building Services Ltd | Construction | 2013 |
| CJG Logistics Ltd | Transport & logistics | 2025 |
| CJL Autos Limited | Wholesale & retail | 2022 |
| CJM Construction (SW) Limited | Construction | 2025 |
| CJM Electrical Solutions Ltd | Energy | 2020 |
| CJS Classic Cars Ltd | Wholesale & retail | 2026 |
| CK Insulation Limited | Construction | 2018 |
| CKD Haulage Ltd | Transport & logistics | 2019 |
| CKR Brickwork Limited | Financial services | 2019 |
| Clapham Books Limited | Wholesale & retail | 2006 |
| Clarence Place (Sheppey) Management Company Limited | Households | 2008 |
| Clarion Oak Holdings Ltd | Construction | 2025 |
| Clark Coaching Ltd | Administrative & support | 2016 |
| Classic Audio Ltd | Manufacturing | 2020 |
| Classy Nails & Beauty (KT) Limited | Other services | 2019 |
| Clauduchef Ltd | Wholesale & retail | 2023 |
| Clavelshay Solutions Limited | Professional & scientific | 2018 |
| Clay Architecture Limited | Professional & scientific | 2003 |
| Clean and Fresh Homes Ltd | Administrative & support | 2011 |
| Clean Delivery Ltd | Transport & logistics | 2024 |
| Clean Touches Services Limited | Administrative & support | 2026 |
| Clean Wizards (South East) Ltd | Administrative & support | 2019 |
| Cleaned to Perfection Ltd | Administrative & support | 2022 |
| Clear Minerals Ltd | Wholesale & retail | 2022 |
| Clear Water Cleaning Services (Kent) Ltd | Administrative & support | 2006 |
| Clearhaven Living Ltd | Health & social care | 2026 |
| Clearwater Cleaning Solutions Limited | Administrative & support | 2011 |
| Clearways Sales Limited | Wholesale & retail | 2015 |
| Cleaverhouse Limited | Professional & scientific | 1987 |
| Clevercrest Academy Ltd | Education | 2024 |
| Client Centred Nursing Agency Limited | Health & social care | 2014 |
| Clifton Fintech Advisory Ltd | Professional & scientific | 2025 |
| Clive Martin Services Ltd | Information & communication | 2020 |
| Clme - Accounts and Taxation Ltd | Professional & scientific | 2021 |
| Clme - IT Solutions Ltd | Wholesale & retail | 2024 |
| Clme - SA Imports Ltd | Wholesale & retail | 2022 |
| Cloaca Surveys Ltd | Professional & scientific | 2012 |
| Clockback Ltd | Health & social care | 2008 |
| Close Brothers Homes Limited | Real estate | 2021 |
| Clothing Supply and Co Ltd | Wholesale & retail | 2026 |
| Clothing Supply and Demand Ltd | Wholesale & retail | 2026 |
| Cloud Homes Properties Limited | Real estate | 2024 |
| Cloud Logik Ltd | Professional & scientific | 2018 |
| Cloud Logik Software Services Limited | Professional & scientific | 2023 |
| Cloverlay Car Sales Limited | Wholesale & retail | 2023 |
| CM Watson Holdings Limited | Administrative & support | 2024 |
| CM Watson Lettings Limited | Real estate | 2022 |
| CMD Design Services Ltd | Professional & scientific | 2025 |
| CMS National Ltd | Construction | 2025 |
| CNC Gillingham Limited | Construction | 2025 |
| Cnda Payments Ltd | Information & communication | 2026 |
| Cntr Stage Ltd | Administrative & support | 2026 |
| Co Living Company South East Ltd | Real estate | 2020 |
| Coached by Carmichael Ltd | Arts & recreation | 2024 |
| Cocilive Limited | Information & communication | 2024 |
| Coco Pristine Cleaning Solutions Ltd | Administrative & support | 2025 |
| Cocolin's Limited | Transport & logistics | 2025 |
| Codecraftersconsulting Ltd | Information & communication | 2025 |
| Codex MM Limited | Transport & logistics | 2025 |
| Coffee & Go Ltd | Wholesale & retail | 2024 |
| Coffee and Canines Ltd | Wholesale & retail | 2023 |
| Coffee X Group Ltd | Hospitality | 2025 |
| Coffee@Hempstead Hub Limited | Hospitality | 2025 |
| Cognisafe Ltd | Information & communication | 2025 |
| Cognivive Ltd | Professional & scientific | 2025 |
| Coin and Confidence Coaching Ltd. | Professional & scientific | 2020 |
| Coking Farm Limited | Agriculture & fishing | 2010 |
| Cole, Port & Woollon Limited | Professional & scientific | 2011 |
| Colin Bicker Tiling & Bathrooms Ltd | Construction | 2006 |
| Collier Rebar Limited | Other services | 2013 |
| Collier Steel Ltd | Administrative & support | 2023 |
| Collyer & SON Limited | Construction | 1999 |
| Colos TSN Ltd | Real estate | 2025 |
| Combat Sports Academy Ltd | Arts & recreation | 2008 |
| Comfort at Home Care Ltd | Health & social care | 2023 |
| Comfort Care Providers Ltd | Health & social care | 2011 |
| Comfy Plus PTY Ltd | Wholesale & retail | 2018 |
| Commerceng Ltd | Wholesale & retail | 2002 |
| Commercial Procurement Consultancy Limited | Professional & scientific | 2013 |
| Commercial Property Kent Ltd | Real estate | 2025 |
| Commercial Transport in Preservation Limited | Arts & recreation | 2004 |