| Chips & Dinks Ltd | Manufacturing | 2016 |
| Chizso Limited | Health & social care | 2011 |
| CHM Developments (Kent) Ltd | Construction | 2022 |
| CHM Properties (Kent) Ltd | Real estate | 2009 |
| Chris Weston PGA Limited | Administrative & support | 2013 |
| Chrisomo Limited | Wholesale & retail | 2022 |
| Christ College | Education | 2008 |
| Christel Healthcare Ltd | Health & social care | 2023 |
| Christel IT Solutions Limited | Information & communication | 2003 |
| Christians Heating Services Ltd | Construction | 2026 |
| Chrome Property Services UK Ltd | Real estate | 2023 |
| Chronicle Care UK Ltd | Health & social care | 2022 |
| CI3 Eridge Holdings Limited | Wholesale & retail | 2025 |
| CI3 Eridge Limited | Wholesale & retail | 2007 |
| Circular Lighting Solutions Ltd | Professional & scientific | 2024 |
| Citizens Advice Bureau in Swale | Professional & scientific | 2004 |
| Cito's Learners Ltd | Education | 2024 |
| City Developers Limited | Construction | 2020 |
| City of London Communications Limited | Wholesale & retail | 1998 |
| Citydor Solutions Limited | Manufacturing | 2017 |
| Cityi Limited | Administrative & support | 2019 |
| Cityimpact Management Consulting Ltd | Professional & scientific | 2010 |
| Citytour Ltd | Administrative & support | 2024 |
| Cityview Construction (Rochester) Ltd | Construction | 2019 |
| Ciully Transport Ltd | Transport & logistics | 2019 |
| Civilsworx Limited | Administrative & support | 2023 |
| CJ Education Solutions Ltd | Education | 2025 |
| CJ Swift Procurement Services Limited | Wholesale & retail | 2025 |
| CJA Healthcare Limited | Public administration | 2018 |
| CJB Construction Ltd | Construction | 2025 |
| CJE Facilities Services Ltd | Administrative & support | 2024 |
| CK Jointing Limited | Construction | 2015 |
| CKG Properties Ltd | Real estate | 2022 |
| Clara Batten Ltd | Arts & recreation | 2021 |
| Clarets Consortium Ltd | Arts & recreation | 2023 |
| Clarus Residents Chequers Hill Ltd | Households | 2016 |
| Class Glass Limited | Construction | 2019 |
| Classic Curtains Kent Limited | Wholesale & retail | 2017 |
| Classic Project Management Limited | Construction | 2006 |
| Claxfield Property Company Limited | Administrative & support | 1998 |
| Clean Fit Windows Limited | Construction | 2025 |
| Clean Genie Dartford & Medway Ltd | Administrative & support | 2022 |
| Clear Sight Optical Ltd | Health & social care | 2024 |
| Clearmac Ltd | Construction | 2023 |
| Clearspan Services Ltd | Administrative & support | 2025 |
| Clearview South East Ltd | Manufacturing | 2026 |
| Clever Engineering (Kent) Ltd | Administrative & support | 2010 |
| Clickbuzz Limited | Wholesale & retail | 2025 |
| Cliffe Property Management Limited | Real estate | 2020 |
| Clint Heine Limited | Professional & scientific | 2015 |
| Clinton Jakes Limited | Construction | 1992 |
| Cloud Supreme Limited | Information & communication | 2020 |
| Cloude Consultancy Ltd | Administrative & support | 2025 |
| Cloude Holdings Ltd | Financial services | 2025 |
| Cloude Investments Ltd | Real estate | 2020 |
| CM Innovations Ltd | Professional & scientific | 2022 |
| CM Maintenance Ltd | Wholesale & retail | 2010 |
| CMA Electrical (Kent) Limited | Construction | 2014 |
| CMJ Electrical Services Limited | Construction | 2020 |
| CMR Smart Repair Ltd | Wholesale & retail | 2014 |
| CNA Construction & Engineering Ltd | Construction | 2018 |
| Cnjj Property Ltd | Real estate | 2025 |
| CNM Precision Finance Limited | Professional & scientific | 2024 |
| Coati Limited | Administrative & support | 2025 |
| Cockell's Limited | Wholesale & retail | 2008 |
| Coffee Arts and Media Ltd | Information & communication | 2003 |
| Cogol Concerns Limited | Professional & scientific | 2011 |
| Cole Blue Media Ltd | Information & communication | 2015 |
| Cole Electrical Services Ltd | Construction | 2017 |
| Colea Trans Ltd | Transport & logistics | 2023 |
| Coleman Building Services Ltd | Construction | 2022 |
| Coleshall Development Ltd | Construction | 2018 |
| Coleshall Gate Management Limited | Households | 2020 |
| Colin Maleed Delivery Services Ltd | Transport & logistics | 2010 |
| Collster Ltd | Health & social care | 2023 |
| Colombier (UK) Limited | Manufacturing | 1968 |
| Colwin Motorcycles Ltd | Wholesale & retail | 2015 |
| Colwins Ltd | Wholesale & retail | 2015 |
| Combine Parts Ltd | Wholesale & retail | 2022 |
| Commercail Solutions Ltd | Wholesale & retail | 2019 |
| Commerce Plus Ltd | Professional & scientific | 2025 |
| Commercial Building Contractors Ltd | Construction | 2023 |
| Commercial Environment Limited | Administrative & support | 1998 |
| Commercial Environment South East Limited | Administrative & support | 2005 |
| Committedgiving Ltd | Information & communication | 1999 |
| Compact and Bale Limited | Water & waste | 2000 |
| Compare My Facilities Ltd | Information & communication | 2024 |
| Complete Refrigeration Services (S.E.) Limited | Construction | 2018 |
| Comprehensive Coverings Limited | Construction | 1960 |
| Concorde Metals Limited | Other services | 2012 |
| Connaught Competition Engines Ltd | Wholesale & retail | 2022 |
| Conscious Studio Pottery Ltd | Arts & recreation | 2025 |
| Consonards Limited | Wholesale & retail | 2017 |
| Constantia Sittingbourne Limited | Manufacturing | 1995 |
| Construction Composites Limited | Manufacturing | 2005 |
| Construction Management Services (Kent) Ltd | Professional & scientific | 2003 |
| Controlmatic Ltd | Manufacturing | 2013 |
| Conway 24/7 Recovery Limited | Wholesale & retail | 2025 |
| Conway Commercials Ltd | Wholesale & retail | 2018 |
| COO & BOO Ltd | Wholesale & retail | 2025 |