| Clear Plan Roofing Ltd | Construction | 2025 |
| Clearon Removals Ltd | Transport & logistics | 2026 |
| Clearwater Films Limited | Information & communication | 2023 |
| Clearwater Power Technology Limited | Professional & scientific | 2006 |
| Clifford Construction Limited | Construction | 2005 |
| Clifford Land and Property Developments Limited | Construction | 2007 |
| Clifford Screeding Services Limited | Construction | 2020 |
| Clinformatiq Private Limited | Information & communication | 2025 |
| Cliveden Management Limited | Households | 1992 |
| Cllc Consulting (UK) Limited | Professional & scientific | 2023 |
| Clockwork INK Tattoo Studio Ltd | Arts & recreation | 2018 |
| Cloisters (Canterbury) Residents Association Limited(The) | Households | 1976 |
| Cloudcrazy Ltd | Other services | 2017 |
| Cloudier Skies Ltd | Professional & scientific | 2022 |
| Cloudnetra Limited | Information & communication | 2025 |
| Cloudsafe Technologies Ltd | Information & communication | 2023 |
| Cloudtrack Solutions Limited | Information & communication | 2025 |
| Club Wifi Limited | Information & communication | 2007 |
| Club Wild Ltd | Education | 2025 |
| Clueless Design Company Ltd | Professional & scientific | 2025 |
| CM Psychotherapy Ltd | Health & social care | 2024 |
| CMB Construction Developments Limited | Construction | 2026 |
| Cmge Limited | Real estate | 2025 |
| CMP Planning Ltd | Construction | 2024 |
| Cmrda Horse Account Limited | Arts & recreation | 2013 |
| CMS Cartridges Ltd | Information & communication | 2003 |
| CN Chatham Limited | Hospitality | 2025 |
| CN Rochester Limited | Hospitality | 2025 |
| CN Serenity Estates Ltd | Real estate | 2026 |
| Cnewman Investments Ltd | Households | 2024 |
| Cngz Barbers Ltd | Other services | 2021 |
| Coach House Mews (Elham) Limited | Real estate | 2004 |
| Coach House Sturry Management Limited | Real estate | 2018 |
| Coalition Against Nitrites Limited | Professional & scientific | 2024 |
| Coast House Residents Limited | Households | 2024 |
| Coburn Ferris Estates Ltd | Real estate | 2023 |
| Coconuts Network Ltd | Information & communication | 2021 |
| Cocoon Infinity Ltd | Financial services | 2014 |
| Code 3 Construction Limited | Construction | 2023 |
| Code Kids Kent Limited | Education | 2021 |
| Codep Innovations Limited | Professional & scientific | 2025 |
| Codfather Kent Limited | Hospitality | 2017 |
| Coeus Europe Ltd | Administrative & support | 2008 |
| Coffee and Keys Limited | Hospitality | 2024 |
| Cofide Limited | Information & communication | 2024 |
| Cognivus Limited | Information & communication | 2025 |
| Cohere IT Limited | Information & communication | 2006 |
| Cohline (U.K.) Limited | Manufacturing | 1990 |
| Cole Ironcraft Limited | Manufacturing | 1962 |
| Coleman Parkes Research Limited | Professional & scientific | 2000 |
| Collabconsult Limited | Information & communication | 2022 |
| Collaborate Consulting Ltd | Professional & scientific | 2023 |
| COLLECT24 Ltd | Information & communication | 2011 |
| Collett Construction Limited | Construction | 2002 |
| Collins Classics Ltd | Wholesale & retail | 2020 |
| Colophon Holdings Limited | Arts & recreation | 2021 |
| Colt Estates Limited | Other services | 1937 |
| Colton Design Limited | Professional & scientific | 2019 |
| Combined Trade Logistics Ltd | Wholesale & retail | 2025 |
| Comfy Tech Ltd | Wholesale & retail | 2025 |
| Commercia Insights Ltd | Extraterritorial | 2024 |
| Commercial Concerns (Lettings) Limited | Real estate | 2008 |
| Commercial Concerns Limited | Real estate | 1993 |
| Commercial Engine Parts Limited | Wholesale & retail | 2011 |
| Commercial Global Management Ltd | Professional & scientific | 2014 |
| Commodore Court Residents Ltd | Extraterritorial | 2000 |
| Commons Club Ltd | Information & communication | 2021 |
| Comms Recycling Ltd | Administrative & support | 2013 |
| Community Founder Ltd | Professional & scientific | 2023 |
| Community Gyms Limited | Education | 2016 |
| Comoea UK Limited | Health & social care | 2014 |
| Compare Health Tests Limited | Health & social care | 2023 |
| Complete Electrical Installations Ltd | Construction | 2023 |
| Complete Fibre Delivery Limited | Construction | 2023 |
| Complete Group Holdings Limited | Financial services | 2015 |
| Complete Health & Safety Ltd | Professional & scientific | 2002 |
| Complete Technology Group Limited | Information & communication | 2020 |
| Complete Technology Services Limited | Information & communication | 2020 |
| Complete Technology Solutions Limited | Information & communication | 2020 |
| Composite Decking Supply UK Ltd | Wholesale & retail | 2021 |
| Concept: Skin Limited | Manufacturing | 2012 |
| Concerted Living Ltd | Real estate | 2021 |
| Concorde (International) Summer Schools Limited | Education | 1972 |
| Concorde House Clinic Limited | Other services | 2012 |
| Concorde International Education Group Limited | Education | 2021 |
| Concorde International Limited | Education | 2021 |
| Confident Care 24/7 Ltd | Professional & scientific | 2019 |
| Confident Care Homes Ltd | Health & social care | 2021 |
| Confident Constructors Ltd | Construction | 2019 |
| Confident Learning Solutions Ltd | Administrative & support | 2020 |
| Conflict and Governance Training Ltd | Education | 2025 |
| Conjaz Media Solutions Ltd | Construction | 2025 |
| Connair Ltd | Transport & logistics | 2021 |
| Connect Exhibitions Limited | Manufacturing | 2000 |
| Connect FM Limited | Other services | 2012 |
| CONNECT3UK Ltd | Construction | 2025 |
| Connelly Contours Limited | Professional & scientific | 2023 |
| Conquering Dreams Limited | Other services | 2026 |
| Consolidated Power Inc Limited | Construction | 2012 |
| Consta Ltd | Construction | 2015 |