| Clairwood Accounting LLP | | 2016 |
| Clarence Mews (Dorset Road) Limited | Households | 2014 |
| Claverley Properties Ltd | Real estate | 2019 |
| Clevedon Court (Bexhill-On-Sea) Limited | Households | 1998 |
| Click IT Consulting Ltd | Administrative & support | 2003 |
| Clifton Construction (South East) Limited | Construction | 2025 |
| Clock Tower Court (Bexhill) RTM Company Limited | Households | 2011 |
| Closr.Com Limited | Extraterritorial | 2009 |
| Clvrly Limited | Information & communication | 2025 |
| CMB Drone Solutions Limited | Construction | 2021 |
| CMC Services Autos & Recovery Ltd | Wholesale & retail | 2025 |
| Coar Developments Ltd | Manufacturing | 2024 |
| Coastline Web Services Ltd | Professional & scientific | 2026 |
| Coghurst Hall Holiday Village Limited | Hospitality | 1989 |
| Colben Court Residents Limited | Households | 2005 |
| Collaborative Ventures Limited | Health & social care | 2011 |
| Collington Bexhill Ltd | Real estate | 2025 |
| Come AS YOU ARE CIC | Health & social care | 2025 |
| Comitas Strategy Limited | Professional & scientific | 2020 |
| Commercial Vehicle Contracts (Hire) Ltd | Wholesale & retail | 2025 |
| Commodities Engineering Services Ltd | Information & communication | 2019 |
| Compass Kitchens 66 Ltd | Construction | 2019 |
| Complete Block Management Limited | Real estate | 2021 |
| Complete Building Design Limited | Construction | 2013 |
| Complete Freehold Holdings Limited | Real estate | 2021 |
| Complete Solar & Renewables Ltd | Construction | 2022 |
| Confetti Entertainment Ltd | Arts & recreation | 2020 |
| Conqueror Consulting Limited | Information & communication | 2016 |
| Conquest House Limited | Real estate | 2006 |
| Constant Pursuit Crossfit Ltd | Arts & recreation | 2022 |
| Construction in Focus Limited | Construction | 2020 |
| Controlbnb Ltd | Administrative & support | 2022 |
| Controlled Chaos Entertainment Ltd | Arts & recreation | 2026 |
| Cooden Court Resident's Association Limited | Households | 1969 |
| Cooden Heights Limited | Real estate | 2012 |
| Cooden Heights RTM Company Limited | Households | 2011 |
| Cooden Medical Group Limited | Health & social care | 2014 |
| Cookham Dene (Bexhill) Limited | Households | 2005 |
| Cooler Solutions (Air Conditioning) Limited | Construction | 2020 |
| Coopers Cherry Pickers Ltd | Administrative & support | 2021 |
| Copperworx Plumbing & Heating Limited | Construction | 2019 |
| Coresteady Limited | Wholesale & retail | 2016 |
| Corindale Consulting Ltd | Professional & scientific | 2022 |
| Corked Cellars Limited | Wholesale & retail | 2023 |
| Cosmos Care Limited | Health & social care | 2018 |
| Courthouse Place Residents Limited | Households | 2014 |
| CP Acquisitionco Limited | Professional & scientific | 2005 |
| CP Equityco Limited | Professional & scientific | 2005 |
| CR Investments Ltd | Real estate | 2023 |
| Crafted Living Ltd | Professional & scientific | 2025 |
| Create Curiosity CIC | Education | 2024 |
| Creative Barking and Dagenham Limited | Arts & recreation | 2023 |
| Creative Entrepreneurs Ltd | Administrative & support | 2013 |
| Cresco Aviation LLP | | 2025 |
| Cresco Holdings Limited | Financial services | 2024 |
| Cribb and Hammer Ltd | Other services | 2014 |
| Crimson Solutions Limited | Information & communication | 1998 |
| Crispin Court Freehold Bexhill Ltd | Households | 2024 |
| Croft Chapel (Hastings) Management Company Limited | Households | 1973 |
| Crowhurst Farm Developments LLP | | 2008 |
| Crown Roofing Specialists Limited | Construction | 2000 |
| Cruikshank & Weatherley Limited | Real estate | 2025 |
| Crump Winter Holdings Ltd | Financial services | 2025 |
| Crumpwood Ltd. | Hospitality | 2004 |
| CSA Insurance & Risk Consultants Limited | Financial services | 2002 |
| CSB Project Management Limited | Construction | 2023 |
| CSD Security Limited | Administrative & support | 2025 |
| Csdesign Interior Architecture Ltd | Professional & scientific | 2023 |
| Ctre Property Development Ltd | Construction | 2023 |
| Ctrl-Art Studios Limited | Arts & recreation | 2025 |
| Cuisine Inspired by Georgiou Ltd | Hospitality | 2024 |
| Cullingford Maintenance Services Limited | Construction | 2025 |
| Custom Cafe Limited | Hospitality | 2017 |
| Cutting the UK Ltd | Agriculture & fishing | 2018 |
| D & S Chestnut Ltd | Agriculture & fishing | 2019 |
| D & T Drylining Limited | Construction | 2003 |
| D Foord Joinery Ltd | Manufacturing | 2018 |
| D Lowers Home Improvements Limited | Construction | 2023 |
| D&C 268 Limited | Real estate | 2025 |
| D&L Automotive Ltd | Wholesale & retail | 2026 |
| D&L European Ltd | Transport & logistics | 2026 |
| D&L Software Consultancy Limited | Information & communication | 2014 |
| D&L Tyres Ltd | Wholesale & retail | 2026 |
| D.C Enterprises (Import/Export) Limited | Wholesale & retail | 1997 |
| D.J.T Estates Limited | Real estate | 2018 |
| D.N.A Building Services Ltd | Construction | 2010 |
| D.O.G.Grooming Studio Limited | Other services | 2014 |
| D3VL Ltd | Information & communication | 2020 |
| D:Ale (Southeast) Limited | Professional & scientific | 2025 |
| Dale Saunders Limited | Construction | 2008 |
| Damik Limited | Financial services | 1990 |
| Damzi Ltd | Health & social care | 2015 |
| Daniel Hill Carpentry & Construction Limited | Construction | 2025 |
| Dark Shark Ltd | Other services | 2021 |
| Davey Gardening Limited | Administrative & support | 2022 |
| David Barrington West Ltd | Extraterritorial | 2022 |
| David Manning Energy Work Ltd | Health & social care | 2021 |
| David Thomas Hairdressing ( Kingston ) Ltd | Other services | 2018 |
| Davies Residential Management Ltd | Real estate | 2026 |
| Davis Metal Recycling Ltd | Wholesale & retail | 2012 |