| Breeze Contracting Limited | Administrative & support | 2020 |
| Brent Cross Association Limited | Other services | 1975 |
| BRG Residential Limited | Real estate | 2020 |
| BRG Specialist Recruitment Ltd | Administrative & support | 2012 |
| Brilliant Marketing Solutions Limited | Professional & scientific | 2010 |
| Broadstairs Scaffolding Limited | Construction | 2008 |
| Bspg Laboratories Limited | Health & social care | 2014 |
| Buchanan Farms Ltd | Agriculture & fishing | 2021 |
| Budget Cars Vehicle Sales Ltd | Wholesale & retail | 2026 |
| Bushell Consulting Ltd | Professional & scientific | 2021 |
| BW Groundworks Ltd | Construction | 2019 |
| Bwpa Ltd. | Information & communication | 2014 |
| CAD Solutions (Dover) Ltd | Administrative & support | 2016 |
| Cain & Co Accounting Solutions Limited | Professional & scientific | 2013 |
| Candice Education Services Ltd | Education | 2003 |
| Cannasseursuk Ltd | Wholesale & retail | 2017 |
| Carbon 6 Education Limited | Education | 2025 |
| Carefell Tree Surgery Limited | Other services | 2016 |
| Carematchuk Ltd | Information & communication | 2020 |
| Carera Associates Limited | Information & communication | 2013 |
| Carers' Support East Kent | Other services | 2010 |
| Carpenters Shepherd’S Huts Limited | Hospitality | 2023 |
| Carroll & Carroll Limited | Financial services | 1982 |
| Carroll Insurance and Properties Limited | Financial services | 2011 |
| Castrum SPV1 Ltd | Construction | 2016 |
| Caxtons Residential Limited | Real estate | 1993 |
| CDE Site Services Limited | Construction | 2016 |
| Celeris Partners Ltd | Administrative & support | 2011 |
| Celestial Technical Services Limited | Construction | 2016 |
| Cetra Property Management Limited | Real estate | 2025 |
| Cevax Services Ltd | Construction | 2014 |
| CG Gymco Ltd | Professional & scientific | 2025 |
| CH1 Ltd | Financial services | 2023 |
| Choice at Home Ltd | Wholesale & retail | 2000 |
| Christysolutions Ltd | Construction | 2025 |
| Cinque Ports Project and Property Management Limited | Real estate | 2005 |
| CJT Systems Ltd | Administrative & support | 2002 |
| Cliffview Developments Kent Ltd | Construction | 2020 |
| Clinco Trustees Limited | Professional & scientific | 2023 |
| Clinical Collation Limited | Administrative & support | 2012 |
| Clockhouse Green Management Company Limited | Households | 2016 |
| Coastal Curations Limited | Wholesale & retail | 2024 |
| Coastal Marina Ltd | Transport & logistics | 2022 |
| Coastal Transit Services Ltd | Arts & recreation | 2022 |
| Coastal View Designs Limited | Professional & scientific | 2026 |
| Coded-Controls Ltd. | Professional & scientific | 1999 |
| Colman Contractors Limited | Construction | 2020 |
| Colwell Transport Ltd | Transport & logistics | 2020 |
| Complete Therapeutic Fostering Ltd | Other services | 2020 |
| Comply Partners Ltd | Professional & scientific | 2025 |
| Concept Automated Systems Limited | Professional & scientific | 1997 |
| Connect B4 Correct Ltd | Other services | 2022 |
| Continuum Energy Group Ltd | Professional & scientific | 2025 |
| Contrast Design & Development Ltd | Construction | 2024 |
| Contrat Online Ltd | Information & communication | 2011 |
| Cooper & Cole Crossways Limited | Construction | 2023 |
| Core Support Consulting Ltd | Professional & scientific | 2026 |
| Corrugated & Compactboard Consultants Ltd | Other services | 2012 |
| Cosmos Financial Solutions Ltd | Professional & scientific | 2017 |
| Coveney Management Services Limited | Professional & scientific | 2001 |
| Creations Hair Designs Limited | Other services | 2003 |
| Creative Crafts Publishing Limited | Wholesale & retail | 1992 |
| Credence Gold UK Ltd | Construction | 2019 |
| Creekview Ltd | Hospitality | 2017 |
| Crosstalk Therapeutics Ltd | Professional & scientific | 2021 |
| Crostline Ltd | Wholesale & retail | 2012 |
| Cuthbert Properties Limited | Administrative & support | 2017 |
| Cyberfort Bidco Limited | Professional & scientific | 2017 |
| Cyberfort Group Limited | Professional & scientific | 2017 |
| Cyberfort Limited | Information & communication | 2004 |
| D. Isom (Printers) Limited | Manufacturing | 1967 |
| Daniela Rossi Ltd | Health & social care | 2024 |
| Darent Power Limited | Professional & scientific | 2009 |
| DAW Farms Limited | Agriculture & fishing | 2010 |
| Dawes Roofing Ltd | Construction | 2022 |
| DCD Project Services Limited | Construction | 2019 |
| DD Tralex TA Ltd | Wholesale & retail | 2023 |
| DE Havilland Electrical Limited | Construction | 2013 |
| DE WIT Property Ltd | Hospitality | 2026 |
| Deal Nursery and Forest School Ltd | Education | 2024 |
| Deepx Health Limited | Professional & scientific | 2019 |
| Delf Farmshop & Nursery Ltd | Wholesale & retail | 2015 |
| Delf Stream Cottage Ltd | Hospitality | 2026 |
| Delor Ltd | Manufacturing | 2017 |
| Desianos Limited | Hospitality | 2013 |
| Deveson Consulting LLP | | 2025 |
| DG Consulting Solutions Limited | Professional & scientific | 2012 |
| DGM Electrical Limited | Construction | 2002 |
| Discovery Flavours Limited | Hospitality | 2024 |
| Discovery Medchem Ltd | Professional & scientific | 2013 |
| Discovery Park Continuous Operations Limited | Administrative & support | 2026 |
| Discovery Scale Ltd | Professional & scientific | 2024 |
| Discovery Start Ltd | Professional & scientific | 2024 |
| Ditton Court Close Development Limited | Construction | 2018 |
| Dloc Biosystems Holdings Ltd | Financial services | 2023 |
| Dloc Biosystems Ltd | Professional & scientific | 2023 |
| DLW Wind and Solar Energy (PTY) Ltd | Construction | 2025 |
| DMB Paraplanning Ltd | Administrative & support | 2022 |
| Dover & District Chamber of Commerce & Industry | Administrative & support | 1906 |
| Doverpaneco Ltd | Professional & scientific | 2024 |