| Coastal Property Services Limited | Real estate | 2016 |
| Cocoon Family Ltd | Health & social care | 2023 |
| CODE888 Ltd | Wholesale & retail | 2025 |
| Coffee Club Broadstairs Limited | Hospitality | 2024 |
| Coffee Station (South East) Limited | Hospitality | 2013 |
| COHORT-360 Ltd | Education | 2025 |
| Col's Kent Bike Tours CIC | Administrative & support | 2023 |
| Collective Crew Global Limited | Hospitality | 2025 |
| Collinson Furniture Ltd | Wholesale & retail | 2020 |
| Colony Tech Ltd | Information & communication | 2024 |
| Comeinnow Limited | Administrative & support | 2023 |
| Commercial News Limited | Information & communication | 2020 |
| Common Ground Records Limited | Information & communication | 2025 |
| Community AD Limited | Information & communication | 2019 |
| Community AD Web Ltd | Professional & scientific | 2011 |
| Community Creative Studios CIC | Arts & recreation | 2024 |
| Community Lifesavers CIC | Education | 2022 |
| Community Stores HQ Limited | Wholesale & retail | 2021 |
| Companies in a Box Limited | Professional & scientific | 2021 |
| Companies Trade & Service Ltd | Administrative & support | 2013 |
| Company Angels Limited | Information & communication | 2021 |
| Compass Bridge Care Recruitment Ltd | Health & social care | 2026 |
| Concept Clothing Ltd | Wholesale & retail | 2020 |
| Confident Coaches Club Ltd | Professional & scientific | 2020 |
| Confluent Funding Intelligence Ltd | Information & communication | 2026 |
| Congregate Works CIC | Arts & recreation | 2026 |
| Connorp Rail Ltd | Construction | 2017 |
| Construction Twenty One Limited | Construction | 2024 |
| Converge Games Ltd | Information & communication | 2024 |
| Cooke & Co (Thanet) Ltd | Real estate | 2014 |
| Coopson Technologies Limited | Construction | 2015 |
| Cope Studio Ltd | Manufacturing | 2019 |
| Coppice Tree & Garden Services Limited | Administrative & support | 2014 |
| Core Ctrl Ltd | Professional & scientific | 2021 |
| Corisa Property Management Ltd | Real estate | 2025 |
| Cornerstone First Limited | Construction | 2025 |
| Corperformance Services Limited | Other services | 2016 |
| COS Property Ltd | Real estate | 2018 |
| Cosmic Hippy Limited | Professional & scientific | 2019 |
| Cosy Toes Heating Services Limited | Construction | 2018 |
| Cottonwood Properties Ltd | Real estate | 2020 |
| Counter Cheese Company Ltd | Wholesale & retail | 2026 |
| Counterbalance Limited | Real estate | 2000 |
| County Cleaning Limited | Administrative & support | 2003 |
| County Refurbishments Limited | Construction | 2018 |
| Countywide Scaffolding Ltd | Construction | 2017 |
| Couture Holdings Limited | Professional & scientific | 1997 |
| Cove Heating Limited | Construction | 2024 |
| Cover Retail Ltd | Wholesale & retail | 2026 |
| Coxx Ltd | Manufacturing | 2026 |
| CPN Building Services Ltd | Construction | 2025 |
| CPR Clapham Limited | Hospitality | 2016 |
| CR Broking Services Limited | Financial services | 2013 |
| Crab Museum CIC | Education | 2019 |
| Crate Studio & Project Space Limited | Arts & recreation | 2004 |
| Crawford Gardens Limited | Hospitality | 2012 |
| CRB Property Maintenance & Refurbishments Ltd | Construction | 2026 |
| Create Happy CIC | Arts & recreation | 2023 |
| Createam Limited | Professional & scientific | 2023 |
| Creative Places London Ltd | Hospitality | 2025 |
| Creative Project Design Ltd | Manufacturing | 2022 |
| Creative Voices | Administrative & support | 2019 |
| Crescendorious Limited | Arts & recreation | 2023 |
| Crescent House Management (Cliftonville) Limited | Households | 2014 |
| Crest Consultants Ltd | Professional & scientific | 2021 |
| Crochetbymariellen Ltd | Wholesale & retail | 2025 |
| Crow Building & Roofing Services Limited | Construction | 2013 |
| Crown Mobility Ltd | Wholesale & retail | 2026 |
| Crowned DAD Family Support CIC | Education | 2025 |
| Crumps Farm Ltd | Real estate | 2025 |
| Crybaby Jazz Ltd | Hospitality | 2021 |
| Crypto Rigs Ltd | Mining & quarrying | 2021 |
| Crysalis Art Ltd | Administrative & support | 2021 |
| Crystal House Kent Ltd | Wholesale & retail | 2023 |
| CS Kent Limited | Manufacturing | 2024 |
| CS Lewis Construction Limited | Construction | 2023 |
| CT Bites Ltd | Hospitality | 2025 |
| CT Kebab House Ltd | Hospitality | 2026 |
| CT11 Construction Limited | Construction | 2026 |
| CT9 Ltd | Professional & scientific | 2024 |
| Ctrl ALT ESC Ltd | Other services | 2017 |
| Ctrl ALT Escape Ltd | Other services | 2020 |
| Cult Properties Ltd | Real estate | 2026 |
| Cunningham & Mason Ltd | Hospitality | 2024 |
| Cuoppo Limited | Other services | 2020 |
| Cupboard Productions Limited | Administrative & support | 2018 |
| Curated Collective Ltd. | Wholesale & retail | 2020 |
| Cure Developments Limited | Households | 1995 |
| Curio Blocks Ltd | Arts & recreation | 2013 |
| Curry Smugglers Ltd | Hospitality | 2024 |
| Curtis Catering Ltd | Hospitality | 2020 |
| Cuyah Ltd | Manufacturing | 2021 |
| CWT Homes Ltd | Real estate | 2017 |
| Cyberbard Ltd | Wholesale & retail | 2024 |
| D & T Building & Maintenance Ltd | Construction | 2024 |
| D R Events Ltd | Hospitality | 2014 |
| D&J Properties Kent Ltd | Real estate | 2017 |
| D.A.E. Enterprises Ltd | Manufacturing | 2025 |
| D.I. Greig Limited | Professional & scientific | 1972 |
| D.J.G. Properties Limited | Construction | 2001 |