| Conway Elite Security Limited | Administrative & support | 2023 |
| Cool Air and Heating Ltd | Construction | 2017 |
| Core Engagement Ltd | Construction | 2020 |
| Corner Carpet Company Limited | Wholesale & retail | 1998 |
| Cornwallis Villa Limited | Households | 2014 |
| Country Lane Accountancy Limited | Professional & scientific | 2016 |
| Countryways Oak Furniture Makers Limited | Manufacturing | 2013 |
| Court Developments (Bexhill) Limited | Construction | 2022 |
| Court Developments (Fryatts Way) Limited | Construction | 2023 |
| Court Developments (Headcorn) Limited | Construction | 2022 |
| Court Developments (Herstmonceux) Limited | Construction | 2021 |
| Court Developments (Knole) Limited | Construction | 2022 |
| Court Developments Limited | Construction | 2019 |
| Courtlands Freeholders Limited | Households | 2007 |
| Courts ARE US Limited | Construction | 2003 |
| Courtwingman Limited | Professional & scientific | 2021 |
| Covehurst Ltd | Hospitality | 2003 |
| CPR Investments (London) Limited | Real estate | 2017 |
| Craft Roofing and Building Ltd | Construction | 2023 |
| Cranbrook Corporate Recovery Limited | Professional & scientific | 2008 |
| Crawleys Timber Structures Limited | Manufacturing | 2017 |
| CRC Collections (UK) Limited | Administrative & support | 2017 |
| CRC Collections Limited | Administrative & support | 2016 |
| Creative Concoctions Community Interest Company | Education | 2023 |
| Creative Conduct Limited | Arts & recreation | 2007 |
| Creative Delusions Ltd | Information & communication | 2024 |
| Creative Educational Services Ltd | Education | 2020 |
| Cremer Limited | Other services | 2018 |
| Croft Hall Hastings Limited | Households | 2014 |
| Cross Options (UK) Limited | Financial services | 1987 |
| Cross-Border Information (London) Ltd. | Information & communication | 2011 |
| Crossfit 1066 Hastings LLP | | 2016 |
| Crossfit 1066 Limited | Arts & recreation | 2021 |
| Crown Dental Burs Limited | Manufacturing | 2021 |
| CRS Group (South East) Ltd | Administrative & support | 2016 |
| Crusha Ltd | Professional & scientific | 2010 |
| Crystal Comps Ltd | Arts & recreation | 2026 |
| Crystal Singing Bowls Temple Ltd | Health & social care | 2024 |
| Crystalaura Jewelry Ltd | Wholesale & retail | 2026 |
| CT Commercial Cleaning Services Limited | Other services | 2024 |
| CT Local Cleaning Services Limited | Other services | 2020 |
| Cultivaters Collective | Professional & scientific | 2016 |
| Curd Brothers Limited | Wholesale & retail | 2024 |
| CUT the Cookie Limited | Information & communication | 2024 |
| Cyberworld Security Limited | Information & communication | 2018 |
| Cygnus Consulting Services Limited | Information & communication | 2023 |
| Cygnus Star Homes Ltd | Real estate | 2026 |
| D & M Hospitality (SE) Ltd | Hospitality | 2024 |
| D & O Humphrey Builders Limited | Construction | 2022 |
| D & S Butler Builders Limited | Construction | 2008 |
| D and S Developments Ltd | Construction | 2024 |
| D Ayton Estates Ltd | Real estate | 2026 |
| D H Plastering Services Limited | Construction | 2019 |
| D Jensen Investment Properties LLP | | 2013 |
| D Smith Electrical Solutions Limited | Construction | 2017 |
| D Stone Services (Hampshire) Limited | Construction | 2009 |
| D Willis Homes Limited | Real estate | 2017 |
| D&N Investment Partners Limited | Professional & scientific | 2024 |
| D.A Langley Ltd | Transport & logistics | 2025 |
| D.J.Ballard Home Renovations Ltd | Construction | 2021 |
| DA Coffey and Associates LLP | | 2017 |
| DA Romeo Events Limited | Hospitality | 2025 |
| DA Romeo Limited | Hospitality | 2025 |
| Dadson Bigg Construction Limited | Construction | 2023 |
| Daily Fresh Fruit and Vegetables Ltd | Wholesale & retail | 2025 |
| Dailystep Limited | Education | 2003 |
| Daly Creative LLP | | 2013 |
| Dando and Dodd Ltd | Professional & scientific | 2025 |
| Dandy Vintage Ltd | Wholesale & retail | 2023 |
| Daneva Limited | Professional & scientific | 2025 |
| Daniel Baines Osteopathy Ltd | Health & social care | 2017 |
| Daniel James Bradley Ltd | Information & communication | 2026 |
| Dans Fencing Ltd | Construction | 2023 |
| Darkstar JIU Jitsu Ltd | Education | 2024 |
| Darley Avenue Ltd. | Wholesale & retail | 2014 |
| Darmaan Ltd | Health & social care | 2022 |
| Dart EMC Filters Limited | Manufacturing | 2018 |
| Datumbase Ltd | Information & communication | 2026 |
| David Broughton Limited | Wholesale & retail | 2013 |
| David Cramp Plumbing & Heating Limited | Construction | 2015 |
| David Fairclough Ltd | Financial services | 2019 |
| David P Development Limited | Information & communication | 2026 |
| Dawson Films Limited | Information & communication | 1999 |
| Daydream Café Ltd | Manufacturing | 2024 |
| Dazzle Car Wash Ltd | Administrative & support | 2025 |
| Dazzling Mission Limited | Information & communication | 2006 |
| Dead Nice Funerals Ltd | Other services | 2025 |
| Deal Diligence Limited | Information & communication | 2012 |
| Deep Ocean Project Management Limited | Administrative & support | 2022 |
| Deerview Fine Foods LLP | | 2015 |
| Dellas Catering Ltd | Hospitality | 2019 |
| Deltascan Limited | Information & communication | 2022 |
| DEM Management Ltd | Other services | 2018 |
| Denaploy Limited | Professional & scientific | 1989 |
| Dens and Signals Ltd | Arts & recreation | 2015 |
| Deparator Limited | Professional & scientific | 2016 |
| Deptech Limited | Professional & scientific | 2007 |
| DESIRES92 Ltd | Hospitality | 2024 |
| Devere Property Investment Limited | Real estate | 2015 |
| Devil Lighting Limited | Manufacturing | 2018 |