| Cafe DEL Margs Ltd | Hospitality | 2025 |
| Callum Endicott Services Limited | Construction | 2024 |
| Camdex Holdings Limited | Information & communication | 2017 |
| Camp Community CIC | Arts & recreation | 2024 |
| Camp Margate Limited | Hospitality | 2022 |
| Canal DU Midi Cycling Tours Ltd | Administrative & support | 2012 |
| Cannon Renovations and Maintenance Ltd | Construction | 2017 |
| Canterbury Balustrades Limited | Construction | 2019 |
| Canterbury Orchestra Productions Ltd | Arts & recreation | 2018 |
| Capital Investing Limited | Real estate | 2016 |
| Car Clinic UK Ltd | Wholesale & retail | 2006 |
| Carbon Free Energy Limited | Construction | 2019 |
| Care Full Economy Ltd | Professional & scientific | 2024 |
| Caribbean Treats Ltd | Hospitality | 2025 |
| Carroll & Gooding 2 Ltd | Real estate | 2021 |
| Carroll & Gooding Ltd | Real estate | 2021 |
| Cartea Enterprise Ltd | Wholesale & retail | 2024 |
| Cartimonds Limited | Extraterritorial | 2023 |
| Caruso Kitchen Limited | Manufacturing | 2015 |
| Caspar & Co Productions Limited | Arts & recreation | 2003 |
| Caspar & Co Property Ltd | Real estate | 2024 |
| Cassie Scans Ltd | Health & social care | 2024 |
| Cassie's Empire Ltd | Wholesale & retail | 2023 |
| Castle Integritas Ltd | Real estate | 2023 |
| Castle Tomes Ltd | Real estate | 2023 |
| Castlewood Construction (Cwhg) Ltd | Construction | 2024 |
| Castlewood Holdings Group Limited | Real estate | 2023 |
| Castlewood Homes Limited | Real estate | 2016 |
| Castlewood Lettings and Management Limited | Real estate | 2024 |
| CC Digital Consultants Limited | Professional & scientific | 2023 |
| CC Property Management (South East) Ltd | Real estate | 2013 |
| CC9IT&T Ltd | Information & communication | 2018 |
| Ccctrans Ltd | Transport & logistics | 2024 |
| Cecil Square Ltd | Real estate | 2023 |
| Cedarwood Property Ltd | Hospitality | 2017 |
| Celsis Group Limited | Manufacturing | 2010 |
| Celsis Limited | Manufacturing | 1992 |
| Central Fire and Security Limited | Construction | 2024 |
| Certax Accounting East Kent Limited | Professional & scientific | 2012 |
| Certax Accounting East Kent Tax Consultancy Ltd | Professional & scientific | 2014 |
| Chalkuk Ltd | Wholesale & retail | 2015 |
| Chamomile Limited | Hospitality | 2019 |
| Champe Ltd | Hospitality | 2022 |
| Changing Tides Music Ltd | Information & communication | 2025 |
| Chantler's Ltd | Professional & scientific | 2018 |
| Chanze Ltd | Manufacturing | 2025 |
| Chapelle Consultants Limited | Professional & scientific | 2002 |
| Chapman Safety Services Ltd | Construction | 2018 |
| Charcoalgrill East Ltd | Hospitality | 2024 |
| Charlies Bar Margate Limited | Hospitality | 2024 |
| Charlotte Place Right to Manage Company Limited | Households | 2018 |
| Chateaux DE Tomes Ltd | Hospitality | 2023 |
| Chatlify Ltd | Professional & scientific | 2025 |
| Cheap Cost Transport Limited | Transport & logistics | 2022 |
| Checkacar Limited | Wholesale & retail | 2016 |
| Cherry Tree Learning Services Ltd | Education | 2017 |
| Chesh Limited | Information & communication | 2017 |
| Chicken Crush Ltd | Hospitality | 2024 |
| Children's Champions Ltd | Education | 2023 |
| Chill East Kent CIC | Education | 2021 |
| Choice Fish Mart Ltd | Wholesale & retail | 2025 |
| Choreo | Education | 1997 |
| Chris Fitzpatrick Offshore Ltd | Manufacturing | 2023 |
| Chris Mcandrew Photography Limited | Professional & scientific | 2004 |
| Chriskentuk Ltd | Information & communication | 2025 |
| Christophe Berreterot Ltd | Other services | 2013 |
| Christopher Grants Financial Planning Ltd | Professional & scientific | 2020 |
| Circular Margate CIC | Other services | 2025 |
| Citizens Advice Thanet | Other services | 2001 |
| Citroens@Romney.Com Limited | Wholesale & retail | 2015 |
| CJ Beauty Kent Ltd | Other services | 2023 |
| Cjej Limited | Financial services | 2021 |
| Claire Diane Ltd | Health & social care | 2021 |
| Claire Morris Travel Ltd | Administrative & support | 2023 |
| Claire Nation Limited | Wholesale & retail | 2026 |
| Clapham Road Restaurants Ltd | Hospitality | 2017 |
| Claremont 56 Limited | Arts & recreation | 2013 |
| Clarke and Co Pubs Ltd | Hospitality | 2023 |
| Clarke Incorporated Ltd | Hospitality | 2026 |
| Clarkey Pubs Ltd | Hospitality | 2026 |
| Clarossa Communications Ltd. | Professional & scientific | 2011 |
| Clayspace Studios Ltd | Arts & recreation | 2015 |
| Clean Sheet Marketing Limited | Professional & scientific | 2021 |
| Cleancrest Construction Limited | Administrative & support | 2025 |
| Cliffs Coffee Ltd | Hospitality | 2023 |
| Cliffs Community Margate CIC | Hospitality | 2023 |
| Clifton Clouds Ltd | Wholesale & retail | 2026 |
| Cliftonville Auto Repairs Ltd | Wholesale & retail | 2024 |
| Cliftonville Avenue Limited | Households | 2021 |
| Cliftonville Developments Limited | Administrative & support | 1998 |
| Cliftonville Off-License Limited | Wholesale & retail | 2018 |
| Cloudtex (UK) Ltd | Information & communication | 2021 |
| Cloudzen Ltd | Hospitality | 2018 |
| Clueit Webb Interiors Ltd | Wholesale & retail | 2021 |
| Cléo Films Ltd | Information & communication | 2023 |
| CMC Margate Limited | Wholesale & retail | 2014 |
| Co-Relate Communication C.I.C. | Professional & scientific | 2021 |
| Coastal and Country Hotels Limited | Hospitality | 2023 |
| Coastal GP Clinic Ltd | Health & social care | 2021 |
| Coastal Holiday Property Ltd | Real estate | 2025 |