| Clickwatches Limited | Wholesale & retail | 2025 |
| Cliff & MI Ltd | Other services | 2019 |
| Cliffe Beauty Studio Ltd | Other services | 2025 |
| Cliffe Bowls Club Community Interest Company | Arts & recreation | 2025 |
| Cliffe Cattery Ltd | Other services | 2015 |
| Cliffe PRE School Ltd | Education | 2023 |
| Cliffe Properties Limited | Real estate | 2011 |
| Cliffe Wood Engineering Services Limited | Professional & scientific | 2011 |
| Cliffe Woods Auto Engineers Ltd | Professional & scientific | 2015 |
| Cliffe Woods Garage Limited | Wholesale & retail | 2001 |
| Cliffe Woods Pre-School | Education | 2003 |
| Cliffe Woods Social Club Limited | Wholesale & retail | 2007 |
| Clifford & Co Holdings Ltd | Construction | 2025 |
| Clinic Operations Limited | Professional & scientific | 2026 |
| Clinica Technologies Limited | Information & communication | 2026 |
| Clinical Link Limited | Health & social care | 2024 |
| Clockwork Reactive Ltd | Construction | 2017 |
| Cloo Properties Ltd | Real estate | 2018 |
| Cloudbay WYN City Enterprise Limited | Administrative & support | 2026 |
| Cloudrock Academy Ltd | Education | 2021 |
| Clout Properties Limited | Construction | 2020 |
| CLT Property Group Ltd | Real estate | 2024 |
| Clutter-B-Gone Ltd | Other services | 2023 |
| CM Videos Ltd | Education | 2021 |
| CMA Tarar Ltd | Transport & logistics | 2025 |
| CMJ Engineering (UK) Limited | Construction | 2013 |
| CMM Property & Services Limited | Other services | 2021 |
| CN Professional Services Limited | Information & communication | 2015 |
| CNK Online Ltd | Wholesale & retail | 2021 |
| CNR Autos Ltd | Wholesale & retail | 2017 |
| Co-Ordinated Design and Build Limited | Extraterritorial | 2021 |
| Co-Ordinated Design and Management Limited | Manufacturing | 2008 |
| Co-Tron Components Limited | Wholesale & retail | 1990 |
| Coach and Horses Holding Co. Ltd | Hospitality | 2025 |
| Coach House Joinery (Whitstable) Ltd | | 2010 |
| Coached South East Ltd | Professional & scientific | 2024 |
| Coaj Site Services Ltd | Construction | 2015 |
| Coastbound Customs Ltd | Wholesale & retail | 2024 |
| COB and PIP Ltd | Wholesale & retail | 2025 |
| Cobblah Properties Ltd | Real estate | 2023 |
| Cobbs Property Services Limited | Real estate | 2016 |
| Cobden Terrace Management Company Limited | Households | 2021 |
| Cobham Delight Limited | Hospitality | 2024 |
| Cobham Inn Ltd | Hospitality | 2026 |
| Cobnut Tree Limited | Hospitality | 2011 |
| Cobra Seats Technology Limited | Manufacturing | 2015 |
| Cochrane Promotions Ltd | Construction | 1981 |
| Coco Basil Catering Limited | Hospitality | 2021 |
| Code Sparky Ltd | Information & communication | 2025 |
| Codemarque Ltd | Information & communication | 2024 |
| Codium Ltd | Education | 2025 |
| Coercive Group Limited | Professional & scientific | 1991 |
| Coercive Systems Limited | Manufacturing | 1992 |
| Coffee Time Kent Limited | Hospitality | 2019 |
| Coffee Time Ltd | Hospitality | 2022 |
| Coleman & James (Holdings) Limited | Financial services | 1994 |
| Coleman & James (Services) Limited | Construction | 1975 |
| Colin Court (Ravensbourne Park Crescent) Residents Company Limited | Households | 1989 |
| Colin Fielon Electrical Contractor Ltd | Construction | 2008 |
| College Health Holdings Ltd | Financial services | 2020 |
| College Health Limited | Health & social care | 2008 |
| College Pharmacy Limited | Health & social care | 2026 |
| Colmere Limited | Real estate | 1981 |
| Colonial (UK) Limited | Construction | 2006 |
| Colonial Managed Assets Limited | Construction | 2009 |
| Colossus Consultancy Services Limited | Information & communication | 2025 |
| Colsey Data Limited | Education | 2023 |
| Comeau Consulting Limited | Information & communication | 2026 |
| Comenden Wood Limited | Extraterritorial | 1997 |
| Comet Security Systems Limited | Administrative & support | 2003 |
| Comfort Cargo and Easy Logistics Limited | Transport & logistics | 2025 |
| Comfort Cooling Services Ltd | Construction | 2020 |
| Comfort Services UK Limited Ltd. | Transport & logistics | 2019 |
| Commercial Assets Limited | Real estate | 2021 |
| Community Coaching and Training Ltd | Education | 2013 |
| Community Connected Care Ltd | Professional & scientific | 2026 |
| Compass Coaching & Change Ltd | Professional & scientific | 2026 |
| Complete Build Facilities (Kent) Ltd | Construction | 2025 |
| Complete Moling Services (South East) Limited | Construction | 2009 |
| Complete Moling Services Holdings Limited | Financial services | 2020 |
| Complete NDT & Inspection Services Ltd | Professional & scientific | 2025 |
| Complete Surveys and Inspections Ltd | Professional & scientific | 2025 |
| Compliance Consultancy Limited | Professional & scientific | 2015 |
| Composite Concepts Ltd | Manufacturing | 2012 |
| Composting Facilities Services Limited | Other services | 2008 |
| CON Aircon Ltd | Construction | 2026 |
| Concept Infrastructure Limited | Construction | 2014 |
| Concern Resources Ltd | Health & social care | 2018 |
| Concourse Holdings Limited | Financial services | 2023 |
| Concrete Construction Property Investments Limited | Real estate | 2015 |
| Connect by Tech Limited | Information & communication | 2023 |
| Connect Staffing Ltd | Health & social care | 2023 |
| Connected Hub Apprenticeships CIC | Education | 2019 |
| Connectus Safedrive Limited | Information & communication | 2019 |
| Connectus Technology London Ltd | Wholesale & retail | 2016 |
| Connell Access Solutions Ltd | Construction | 2025 |
| Connor Stoddart Limited | Construction | 2025 |
| Conpolstruction Limited | Construction | 2014 |
| Conquer With Chloe Ltd | Education | 2023 |
| Conquerors Pentecostal Assembly Ltd | Other services | 2017 |