| Contstantine Holdings Limited | Other services | 2012 |
| Conveyor Maintenance & Engineering Services Limited | Professional & scientific | 2007 |
| Conway Motors Limited | Extraterritorial | 2008 |
| Cooks Properties Limited | Real estate | 2019 |
| Cool House 24 Limited | Hospitality | 2024 |
| Cool Lifts Limited | Construction | 2011 |
| Coombrook Court Limited | Households | 2005 |
| Coombs Construction & Consultancy Ltd | Construction | 2019 |
| Cooper & Co Plumbing and Heating Services Ltd | Construction | 2011 |
| Cooper & Cole Construction Ltd | Construction | 2021 |
| Cooper & Cole Ltd | Construction | 2019 |
| Cooper & Cole Sevue Ltd | Construction | 2023 |
| Cooper Gardens Limited | Other services | 2016 |
| Cooper Ramus Projects Limited | Construction | 2014 |
| Cooperation Partner Ltd | Transport & logistics | 2023 |
| Coopers Carpentry & Construction Limited | Construction | 2014 |
| Coopers Contracting Limited | Professional & scientific | 2019 |
| Coopers FM Limited | Construction | 2024 |
| Coopers of Kent (Property) Limited | Real estate | 2021 |
| Coopers of Kent Limited | Wholesale & retail | 2019 |
| Copak Global Ltd | Professional & scientific | 2025 |
| Copline Ltd | Wholesale & retail | 2023 |
| Copper Apartments Freehold Limited | Households | 2014 |
| Copper Tree Media Ltd | Information & communication | 2015 |
| Copper Tree Video & Photography LP | | 2023 |
| Coppice Primary Partnership | Education | 2018 |
| Coqpit Limited | Hospitality | 2025 |
| Corbel Contractors Limited | Construction | 2024 |
| Corderoy LLP | | 2014 |
| Core Firm Ltd | Administrative & support | 2022 |
| Core the Gym Ltd | Other services | 2018 |
| Corecloud Systems Ltd | Information & communication | 2026 |
| Coredev Solutions Limited | Professional & scientific | 2019 |
| Coregeo Limited | Administrative & support | 2023 |
| Cornerstone Children and Family Independent Assessor Ltd | Health & social care | 2026 |
| Cornwallis Online Limited | Education | 2003 |
| Cornwallis Road Management Limited | Households | 2004 |
| Corpus Christi Contractors Ltd | Construction | 2023 |
| Correct Electrical Solutions Ltd | Construction | 2023 |
| Cortland Capital Ventures Limited | Professional & scientific | 2026 |
| Cortona Finance Limited | Real estate | 2021 |
| Cosentino Outreach Limited | Transport & logistics | 2016 |
| Cosine Solutions Limited | Information & communication | 2021 |
| Cosmedica Limited | Extraterritorial | 2017 |
| Cosmic Blue Ltd | Health & social care | 2020 |
| Cosmo Buy Limited | Wholesale & retail | 2013 |
| Cosmopolitan Medical Clinic Ltd | Health & social care | 2014 |
| Cost Cutter Express Maidstone Ltd | Wholesale & retail | 2021 |
| Cottier Contracting Limited | Construction | 2016 |
| Cottle.It Limited | Information & communication | 2020 |
| Cottleston Ltd | Professional & scientific | 2018 |
| Couch Potato Productions Ltd | Information & communication | 2023 |
| Counselling for Life CIC | Health & social care | 2022 |
| Count Heating Ltd | Manufacturing | 2021 |
| Counterpoint Global, C.I.C. | Professional & scientific | 2011 |
| Country First (SE) Ltd | Agriculture & fishing | 2024 |
| Country Lifestyles Limited | Other services | 2000 |
| County Mechanical Services Limited | Extraterritorial | 2007 |
| County Plumbing Services Limited | Construction | 2005 |
| County Signs (UK) Limited | Manufacturing | 2004 |
| County Town Homes Ltd | Construction | 2014 |
| Couponpaym Ltd | Information & communication | 2022 |
| Court Lodge Farm (Teston) Management Company Limited | Households | 2000 |
| Court Lodge Farm Management Company Limited | Households | 1997 |
| Court Lodge Holidays Limited | Real estate | 1998 |
| Court Lodge Kitchen Limited | Hospitality | 2018 |
| Courtenay Contractors Limited | Construction | 2018 |
| Cousins Snooker Pool & Lounge Limited | Arts & recreation | 2023 |
| Cove Videos Limited | Information & communication | 2019 |
| Coventry Skip Hire Ltd | Other services | 2024 |
| Coveragebook Holdings Ltd | Professional & scientific | 2020 |
| Coveragebook Ltd | Information & communication | 2020 |
| Coveright Ltd | Construction | 2020 |
| Covert Entry Systems Ltd | Other services | 2025 |
| Cowell Logistics Limited | Administrative & support | 2017 |
| Cowen Landscapes (Maintenance) Limited | Administrative & support | 2012 |
| Cowen Landscapes Limited | Professional & scientific | 2016 |
| COX & Sons Construction Limited | Construction | 2003 |
| COX & Sons Environmental Limited | Wholesale & retail | 2012 |
| COX Brothers General Works Limited | Extraterritorial | 1989 |
| Coxann Limited | Information & communication | 1981 |
| Coxheath Fried Chicken and Burgers Ltd | Hospitality | 2025 |
| Coxheath Pizza & Chicken Limited | Hospitality | 2025 |
| Coxheath Veterinary Clinic Ltd | Professional & scientific | 2011 |
| Coyote Productions Limited | Information & communication | 2022 |
| CP Digital Marketing Limited | Professional & scientific | 2013 |
| CP International Associates Ltd | Professional & scientific | 2022 |
| CPE Southern Windows & Doors Limited | Construction | 2026 |
| Cpkm Studio Ltd | Manufacturing | 2023 |
| Cpoint Consulting Limited | Administrative & support | 2013 |
| CPR Recruitment Ltd | Administrative & support | 2016 |
| Cpxr Ltd | Administrative & support | 2026 |
| Cradduck Property Ltd | Real estate | 2025 |
| Craft & Design Experience Limited | Administrative & support | 2003 |
| Craft Brewed Ltd | Manufacturing | 2021 |
| Craft in Focus Ltd | Administrative & support | 2016 |
| Crafted Nature Ltd | Arts & recreation | 2021 |
| Craftedimpressionco Ltd | Wholesale & retail | 2025 |
| Craftstone Developments Ltd | Real estate | 2024 |
| Craftworks Community Limited | Education | 2021 |