| Cook and Gardener Limited | Construction | 2016 |
| Cookie Maison Ltd | Health & social care | 2015 |
| Cool Serve Ltd | Administrative & support | 2001 |
| Coolfactor Limited | Professional & scientific | 2001 |
| Cooper and Lansbury Associates Limited | Administrative & support | 2014 |
| COP Engineering Ltd | Construction | 2026 |
| Copper JAX Contract Maintenance Ltd | Administrative & support | 2019 |
| Copperfield Productions Limited | Other services | 2024 |
| Corda Group Limited | Professional & scientific | 2026 |
| Cordiant AI Ltd | Information & communication | 2026 |
| Core Global UK Limited | Hospitality | 2015 |
| Corinthian Mountfield Ltd | Construction | 2015 |
| Cornel Ltd | Construction | 2021 |
| Cornel Properties Ltd | Construction | 2025 |
| Cornerstone Assets Group Ltd | Real estate | 2026 |
| Cornerstone Prestige Properties Ltd | Real estate | 2024 |
| Cornerstone Supply Chain Ltd | Administrative & support | 2023 |
| Cornwall Property Group Limited | Real estate | 2025 |
| Corolaje Films Ltd | Arts & recreation | 2020 |
| Cortak Services Ltd | Public administration | 2013 |
| Corvalues Ltd | Administrative & support | 2008 |
| Cosmetics Management Ltd | Health & social care | 2013 |
| Cosmo Health Care Limited | Health & social care | 2019 |
| Costa Logistic Ltd | Transport & logistics | 2015 |
| Cotter Consultancy Ltd | Professional & scientific | 2026 |
| Coudray Contracting Ltd | Administrative & support | 2019 |
| Council for Voluntary Service (Medway) | Administrative & support | 1994 |
| Couno Consulting Limited | Information & communication | 2024 |
| Couno Group Limited | Information & communication | 2013 |
| Couno IT Solutions Limited | Information & communication | 2021 |
| Countrywise Pest Control Services Ltd | Other services | 2002 |
| Courierworks Ltd | Agriculture & fishing | 2025 |
| Courso Holdings Ltd | Financial services | 2025 |
| Courso Property Investments Ltd | Real estate | 2025 |
| Coworthy Capital Ltd | Real estate | 2025 |
| COX & Gill(Electrical)Limited | Construction | 1972 |
| Cozy Accomodation Limited | Real estate | 2025 |
| Cozy Estate Agency Limited | Real estate | 2025 |
| CPB Electrical Consulting Ltd | Construction | 2025 |
| CPB Property Investments Ltd | Real estate | 2025 |
| CPC Construction Services Limited | Construction | 2023 |
| CPE Projects Ltd | Construction | 2017 |
| CPE Southern Ltd | Construction | 2017 |
| Cpex Global Ltd | Professional & scientific | 2025 |
| CPM Electrical Services (Kent) Ltd | Wholesale & retail | 2013 |
| CPP Pet Supplies Limited | Wholesale & retail | 2009 |
| CPS Consultancy Limited | Information & communication | 2011 |
| CQ London Ltd | Wholesale & retail | 2024 |
| CR & SJ Bearup Ltd | Agriculture & fishing | 2007 |
| CRA Group Limited | Administrative & support | 2016 |
| Cradle to Comfort Care Ltd | Health & social care | 2025 |
| Craft Valley Traders Ltd | Wholesale & retail | 2024 |
| Crafting Spaces Ltd | Construction | 2025 |
| Craic Ukay Ltd | Wholesale & retail | 2014 |
| Craig Chisholm Tree Surgery Limited | Agriculture & fishing | 2007 |
| Craig Dunbar Property Limited | Real estate | 2025 |
| Craig Dunbar SPV 1 Limited | Real estate | 2025 |
| Craig Wills Ltd | Construction | 2016 |
| Craig Wyllie Consultants Limited | Information & communication | 2013 |
| Craigellachie at Home Limited | Manufacturing | 2021 |
| Crane & Plant Engineering (UK) Limited | Construction | 2004 |
| Cranmer Asset Management Limited | Professional & scientific | 2014 |
| Cranmer Capital Ltd | Real estate | 2012 |
| Cray Phoenix Limited | Administrative & support | 2010 |
| Craythorne Creations Ltd | Manufacturing | 2024 |
| CRC Interiors Ltd | Construction | 2019 |
| CRE8ROOM Limited | Professional & scientific | 2009 |
| Create and Inspire Limited | Professional & scientific | 2008 |
| Create Comfort Ltd | Wholesale & retail | 2010 |
| Creative Carpentry Services Limited | Construction | 2019 |
| Creative Lets Ltd | Real estate | 2019 |
| Creative Medway CIC | Administrative & support | 2025 |
| Creditel Ltd | Information & communication | 2016 |
| Creeping FIG Catering Ltd | Hospitality | 2023 |
| Creeping FIG Ltd | Hospitality | 2021 |
| Crescent Data Limited | Professional & scientific | 2012 |
| Crespidia Ltd | Hospitality | 2019 |
| Crestbank International Limited | Wholesale & retail | 2004 |
| Creststead Healthcare Limited | Health & social care | 2025 |
| Crestway Preschool Ltd | Health & social care | 2017 |
| Crewrights Ltd | Professional & scientific | 2026 |
| Crimson Ascent Ltd | Real estate | 2017 |
| Crin Ltd | Wholesale & retail | 2024 |
| Crismar Ltd | Transport & logistics | 2026 |
| Cristal Support Services Ltd | Construction | 2022 |
| Crittenden Groundworks & Utilities Ltd | Construction | 2025 |
| Crizmer Services (UK) Limited | Health & social care | 2020 |
| CRL Properties Limited | Real estate | 2022 |
| Crosley House Ventilation Limited | | 1977 |
| Crosspoint Partners Limited | Real estate | 2026 |
| Crossways Cars Limited | Wholesale & retail | 2015 |
| Crovanta Ltd | Wholesale & retail | 2026 |
| Crowcreation Ltd | Information & communication | 2015 |
| Crown Cafe Kent Ltd | Hospitality | 2023 |
| Crowned & Co Wellness Ltd | Wholesale & retail | 2026 |
| Crowntowealth Limited | Real estate | 2023 |
| Crowther-Davies Limited | Financial services | 2007 |
| CROZOL101 Limited | Professional & scientific | 2015 |
| Cruz Gyms Limited | Arts & recreation | 2011 |
| CRW Consultancy Ltd | Hospitality | 2015 |