| Chantry Hall Residents Limited | Households | 1982 |
| Chapel & Associates Ltd | Health & social care | 2019 |
| Chapel Farm Estates Limited | Agriculture & fishing | 2020 |
| Chapt Ltd | Construction | 2023 |
| Chapz Barber Shops Ltd | Other services | 2022 |
| Charlotte Quillet Ltd | Professional & scientific | 2017 |
| Charlotte Valkeniers Design Ltd | Arts & recreation | 2013 |
| Charlotte Westbrook Ltd | Other services | 2021 |
| Chart Lifts Ltd | Manufacturing | 2024 |
| Chattel SA Ltd | Other services | 2012 |
| Chauson Limited | Professional & scientific | 2002 |
| Chekkers Properties CIC | Health & social care | 2024 |
| Chequered Flag Events UK Limited | Administrative & support | 2019 |
| Cheriton Food & Wine Ltd | Wholesale & retail | 2022 |
| Cheriton Gardens Limited | Construction | 2025 |
| Cheriton Parc Hotel Limited | Hospitality | 2006 |
| Cheriton Road Limited | Real estate | 2018 |
| Cheriton Road Two Limited | Construction | 2019 |
| Cherry Court (Folkestone) Management Company Limited | Households | 1978 |
| Cherubim Chocolates Ltd | Manufacturing | 2021 |
| China China (Lyminge) Limited | Hospitality | 2021 |
| China Inn Ltd | Hospitality | 2024 |
| Chipara Ltd | Hospitality | 2025 |
| Chippie Contracts Limited | Construction | 2012 |
| Chiswell Control Systems Limited | Professional & scientific | 2022 |
| Chivers Plumbing & Heating Limited | Construction | 2012 |
| Chloe & Co Properties Ltd | Real estate | 2026 |
| Chloe Nails & Spa Ltd | Other services | 2023 |
| Chloe Scott Ltd | Education | 2024 |
| Chopper Carpentry Ltd | Construction | 2023 |
| Chris Henry Photography Ltd | Professional & scientific | 2025 |
| Christ Church Church of England Primary Academy, Folkestone | Education | 2013 |
| Christina Saferide Medical Transport Service Limited | Transport & logistics | 2026 |
| Chummy's Limited | Hospitality | 2005 |
| Chunk's Rubbish Removal Limited | Water & waste | 2020 |
| Chunnel Clearances Limited | Real estate | 1986 |
| Church & Dwight UK Limited | Manufacturing | 1942 |
| Ciao E-Money Ltd | Financial services | 2021 |
| Cinque Ports Freight Services Limited | Transport & logistics | 1982 |
| Ciscon Ltd | Professional & scientific | 2025 |
| Citysec International Ltd. | Administrative & support | 2002 |
| Citywide Home Repairs Ltd | Construction | 2024 |
| CJ Professional Services Ltd | Professional & scientific | 2021 |
| CJC Plumbing and Heating Ltd | Construction | 2024 |
| CJS Site Engineering Limited | Construction | 2007 |
| CJT Commercial Ltd | Professional & scientific | 2025 |
| CK Consulting & Training Ltd | Administrative & support | 2021 |
| CL Kent Cleaning Services Ltd | Administrative & support | 2020 |
| CL Stays Ltd | Real estate | 2026 |
| Clarity Real Estate Limited | Real estate | 2018 |
| Clarktel Ltd | Information & communication | 2023 |
| Clean Air (UK) Limited | Administrative & support | 2013 |
| Clean CUT Barbers 1 Ltd | Other services | 2024 |
| Clean CUT Barbers 2 Ltd | Other services | 2024 |
| Clean CUT Barbers Limited | Other services | 2017 |
| Cleaners on TAP Ltd | Administrative & support | 2024 |
| Clerking and Appeals Associates Limited | Professional & scientific | 2010 |
| Clickso Limited | Wholesale & retail | 2023 |
| Cliff Top Cafe Limited | Hospitality | 2024 |
| Clifton Crescent (25) RTM Company Limited | Households | 2005 |
| Clifton Hotel Limited | Hospitality | 2016 |
| Clifton House (Folkestone) Limited | Households | 2007 |
| Clifton Johnson Property Ltd | Extraterritorial | 2023 |
| Clinical Outcomes Solutions Ltd | Professional & scientific | 2014 |
| Cloake's Limited | Construction | 2003 |
| Cloakes Fire Systems Limited | Other services | 2017 |
| Clock Tower House (Folkestone) Management Company Limited | Households | 2020 |
| Clockhouse Landscaping Limited | Administrative & support | 2015 |
| Clough Harris Limited | Construction | 2002 |
| CLR Search Ltd | Administrative & support | 2011 |
| Club Folkestone Ltd | Hospitality | 2026 |
| Clynton Partners Ltd | Financial services | 2024 |
| Coach Assets Limited | Administrative & support | 2010 |
| Coast & Key Property Ltd | Households | 2025 |
| Coast and Country Building Services Limited | Construction | 2015 |
| Coast and Country Lets Limited | Real estate | 2013 |
| Coast Management Company (Hythe) Limited | Households | 2013 |
| Coast to Coast Construction (United Kindom) Limited | Construction | 2026 |
| Coast to Country Building and Construction Ltd | Construction | 2024 |
| Coastal Developments (Kent) Limited | Real estate | 2004 |
| Coastal Home Developments Ltd | Construction | 2021 |
| Coastal Windows and Blinds Ltd | Construction | 2020 |
| Coaxium Ltd | Construction | 2018 |
| Cobb Estates Ltd | Real estate | 2009 |
| Cockfosters and Barnet Gymnastics Club Ltd | Arts & recreation | 2015 |
| Coco and Co Properties Ltd | Construction | 2024 |
| Coco Riko Limited | Wholesale & retail | 2015 |
| Coffeefolkes Ltd | Hospitality | 2020 |
| Cognizance Limited | Information & communication | 2001 |
| Coleman and Peters Limited | Administrative & support | 2009 |
| Colin Conroy Electrical Services Limited | Construction | 2014 |
| Coll Limited | Health & social care | 1993 |
| Collective Group Property Ltd | Extraterritorial | 2020 |
| Commercial Overseas Drivers International Limited | Transport & logistics | 1992 |
| Commercial Valeting SW Ltd | Other services | 1999 |
| Common Grounding Ltd | Arts & recreation | 2025 |
| Common Thirds Ltd | Other services | 2025 |
| Community Accountants UK Ltd | Professional & scientific | 2019 |
| Community Art Kent CIC | Arts & recreation | 2024 |
| Community Events Limited | Hospitality | 2017 |