| Coach House Electrical Services Ltd | Construction | 2020 |
| Cobham Community Stores C.I.C. | Wholesale & retail | 2012 |
| Cobstone Group Ltd | Information & communication | 2024 |
| Cobthorne Cleaning Contractors Limited | Administrative & support | 2011 |
| Coco Star Limited | Administrative & support | 2014 |
| Code Station Limited | Information & communication | 2010 |
| Cogeanth Ltd | Information & communication | 2016 |
| Cogmentis Ltd | Wholesale & retail | 2008 |
| Cognify AI Ltd | Information & communication | 2025 |
| Cognimo Ltd | Information & communication | 2025 |
| Coinedge Limited | Wholesale & retail | 2020 |
| Colan Group Ltd | Construction | 2015 |
| Colbert Sealant Specialists Limited | Administrative & support | 2026 |
| Cole's & COJ Limited | Transport & logistics | 2016 |
| Cole’S Metalworks Services Ltd | Construction | 2019 |
| Colmuto Ltd | Wholesale & retail | 2025 |
| Colour Factory Kent Limited | Manufacturing | 2021 |
| Colour ME Lush KT Ltd | Other services | 2022 |
| Colyer Estimating Services Ltd | Professional & scientific | 2026 |
| Combat Gyms Inc Ltd | Arts & recreation | 2023 |
| Combicure Ltd | Construction | 2005 |
| Comeg Partners UK Ltd | Real estate | 2020 |
| Comfordek Company Limited | Transport & logistics | 2011 |
| Comfort Heating Limited | Construction | 2025 |
| Comfortable Creations Limited | Construction | 2019 |
| Commercial Maintenance Ltd | Construction | 2026 |
| Commercial Scheduling Limited | Transport & logistics | 2025 |
| Commercial Solutions Limited | Financial services | 2006 |
| Commercial Wharf (Gravesend) Flat Management Company Limited | Households | 2000 |
| Commercial Wharf (Gravesend) Limited | | 1982 |
| Commind UK Limited | Professional & scientific | 2023 |
| Community Hosting and Support CIC | Hospitality | 2019 |
| Community Rising Youth Hub CIC | Education | 2026 |
| Comp Connection Ltd | Wholesale & retail | 2018 |
| Compact Drylining Ltd | Construction | 2020 |
| Compass Ltd | Information & communication | 2018 |
| Compass North Management Limited | Construction | 1988 |
| Complete Pipework Ltd | Construction | 2026 |
| Concept 24 Ltd | Professional & scientific | 2022 |
| Concept Beauty Supply Ltd | Wholesale & retail | 2021 |
| Concept One Architecture Limited | Professional & scientific | 2019 |
| Concordia Construct Ltd | Construction | 2025 |
| Concrete & Screed MIX Ltd | Manufacturing | 2025 |
| Confident Children & Parents CIC | Other services | 2021 |
| Conifer Drive Owners Association Limited | Households | 2014 |
| Coniff Construction Ltd | Construction | 2024 |
| Consano (UK) Limited | Wholesale & retail | 2014 |
| Conscious Intl Impex Ltd | Wholesale & retail | 2024 |
| Consilio Partnership LLP | | 2017 |
| Consort Peckham Ltd | Construction | 2016 |
| Constructeo Ltd | Real estate | 2020 |
| Construction Management D & B Ltd | Administrative & support | 2013 |
| Construction Ninja Ltd | Information & communication | 2025 |
| Construction Solutions Hunter Ltd | Construction | 2024 |
| Constructive Edge Ltd | Professional & scientific | 2025 |
| Consult-It-Software.Net Limited | Information & communication | 2013 |
| Consultoms Limited | Professional & scientific | 2025 |
| Contago Limited | Wholesale & retail | 2023 |
| Contemporary Watercolours (Oakweald) Limited | Information & communication | 1991 |
| Coobi Limited | Construction | 2006 |
| Cooklands TN12 Ltd | Construction | 2025 |
| Cool-Heat Systems Ltd | Energy | 2006 |
| Cooling Careers & Consultancy Limited | Administrative & support | 2023 |
| Coolstone Creative Studio Ltd | Wholesale & retail | 2026 |
| Cooper Onsite Solutions Ltd | Administrative & support | 2018 |
| Coopower Ventures Limited | Wholesale & retail | 2014 |
| Cophill Power Engineering Limited | Energy | 2016 |
| Core Contractor Solutions Limited | Administrative & support | 2025 |
| Core Reformer Training Academy Ltd | Arts & recreation | 2025 |
| Corms Limited | Real estate | 2005 |
| Corson Plumbing Ltd | Construction | 2019 |
| Cory&Alin Ltd | Transport & logistics | 2019 |
| COS Transport Ltd | Transport & logistics | 2022 |
| Cosanta Investments Limited | Real estate | 2012 |
| Costa Construction Services Ltd | Construction | 2017 |
| Costi &Lavi Ltd | Transport & logistics | 2020 |
| Costica Trans Ltd | Transport & logistics | 2017 |
| Costruck Service Ltd | Wholesale & retail | 2020 |
| Costytrans Sped Ltd | Transport & logistics | 2024 |
| Coton Park Consortium Limited | Real estate | 1999 |
| Cotswold Electrical Limited | Energy | 2019 |
| Cotswold Landscapes & Design Ltd | Construction | 2026 |
| Council for Voluntary Service North West Kent | Administrative & support | 2004 |
| County Probate Services Ltd | Professional & scientific | 2015 |
| County Transport Services Ltd | Transport & logistics | 2018 |
| Courtneyvictoria Ltd | Administrative & support | 2019 |
| Courtside Management Ltd. | Households | 1981 |
| Covenant Wealth Properties Ltd | Professional & scientific | 2025 |
| COX Brothers Limited | Construction | 2003 |
| CP Construction Pairs Ltd | Other services | 2024 |
| CPA Retail Limited | Wholesale & retail | 2023 |
| CPP (Crayford) Limited | Manufacturing | 2006 |
| CPP - LM Limited | Manufacturing | 1979 |
| CQ Property Ltd Ltd | Real estate | 2021 |
| CR Property Developments Limited | Construction | 2022 |
| Craft Plus Ltd | Health & social care | 2021 |
| Craig D Hunt Ltd | Professional & scientific | 2025 |
| Crane Mats UK Limited | Administrative & support | 2024 |
| Cravva Ltd | Hospitality | 2025 |
| Cray Mercantile Finance Limited | Real estate | 1957 |