| Curpro Limited | Real estate | 2018 |
| Currier Plastering Limited | Construction | 2016 |
| Curtconn Planning Services Limited | Professional & scientific | 2023 |
| Curteis Management Limited | Extraterritorial | 2010 |
| Curtis London Limited | Other services | 2016 |
| Curvelo Consulting Limited | Information & communication | 2025 |
| Cushman Ltd | Administrative & support | 2016 |
| Custodiapro Systems Ltd | Information & communication | 2024 |
| Custom Wytelyne Powder Coating Limited | Manufacturing | 1994 |
| Customer Service & Professional Systems Limited | Construction | 2022 |
| Customers Holdings Limited | Financial services | 2016 |
| Customers International Limited | Information & communication | 1990 |
| CUT Loose Limited | Other services | 2003 |
| CUT Mark Engrave Ltd | Professional & scientific | 2025 |
| Cutting Edge Locksmiths Ltd | Administrative & support | 2023 |
| CV Consult Ltd | Administrative & support | 2025 |
| CVM Stanca Ltd | Transport & logistics | 2025 |
| CW Transport Services Ltd | Transport & logistics | 2025 |
| CWB Holdings Limited | Extraterritorial | 2024 |
| CWB Properties (Kent) Limited | Real estate | 2025 |
| CWL Commercial Limited | Administrative & support | 2016 |
| CX Advisory Ltd | Information & communication | 2025 |
| CX Tech Solutions Ltd | Real estate | 2024 |
| CY Sitweb Ltd | Construction | 2017 |
| Cyber Design Factory Limited | Information & communication | 2002 |
| Cyberage Solutions Ltd. | Information & communication | 2018 |
| Cybrien Limited | Construction | 2016 |
| Cyclops Art Ltd | Arts & recreation | 2012 |
| CYE Import Ltd | Wholesale & retail | 2023 |
| Cyma Architects Limited | Professional & scientific | 2000 |
| Cynaa Limited | Wholesale & retail | 2026 |
| Cynon Protection Ltd | Administrative & support | 2011 |
| Czarny Courier Ltd | Transport & logistics | 2017 |
| D & a Watson Limited | Construction | 2020 |
| D & L UK Properties Ltd | Real estate | 2026 |
| D & L Windows Limited | Construction | 2003 |
| D & P Warden Ltd | Agriculture & fishing | 2012 |
| D & S Cordrey Limited | Construction | 1988 |
| D & W Carpentry Limited | Construction | 2017 |
| D & W Catering Limited | Hospitality | 2019 |
| D a Codling Limited | Construction | 2008 |
| D Birkby Brickwork Ltd | Construction | 2015 |
| D D B Services Limited | Construction | 2006 |
| D Dury Signalling Ltd | Professional & scientific | 2022 |
| D E Plumbing (Kent) Ltd | Construction | 2017 |
| D Flisher Carpentry Limited | Construction | 2007 |
| D J Lyons Roofing Limited | Construction | 2026 |
| D Laxmi Jewellers Ltd | Wholesale & retail | 2016 |
| D Mcginnity Consultants Limited | Professional & scientific | 2012 |
| D Moore Electrical Limited | Construction | 2025 |
| D P S Services (South East) Limited | Manufacturing | 2009 |
| D R S S Logistics Limited | Transport & logistics | 2022 |
| D Unwin Limited | Wholesale & retail | 2011 |
| D&D Top Ltd | Construction | 2023 |
| D&E Property Group Ltd | Real estate | 2023 |
| D&J Executive Solutions Ltd | Manufacturing | 2023 |
| D&P Bespoke Builds Ltd | Manufacturing | 2018 |
| D.A.N. Property Services Ltd | Manufacturing | 2019 |
| D.A.T Delivery Ltd | Transport & logistics | 2025 |
| D.Atkins-C.E. Contractors Limited | Agriculture & fishing | 2001 |
| D.B Services Inc Ltd | Other services | 2020 |
| D.Bailey Ltd | Construction | 2018 |
| D.C. Pensions & Investment Ltd | Financial services | 2000 |
| D.E.D Valeting Ltd | Other services | 2017 |
| D.E.M. Builders Limited | Administrative & support | 2010 |
| D.E.M. Building Solutions Ltd | Construction | 2025 |
| D.E.M. Residential Letting Ltd | Real estate | 2024 |
| D.E.Thomas & Sons Limited | Wholesale & retail | 1979 |
| D.H. Croney & SON Limited | Transport & logistics | 2004 |
| D.J. Adams Electrical Limited | Construction | 2001 |
| D.J. Baker Electrical Services Limited | Construction | 2014 |
| D.J. Hill (Heating) Ltd | Wholesale & retail | 1995 |
| D.R. Nolans & Co Limited | Professional & scientific | 2020 |
| D.R.Nicholson Limited | Professional & scientific | 2016 |
| D.T. Agri Ltd | Agriculture & fishing | 2021 |
| D.V. Godden Engineering Limited | Manufacturing | 1976 |
| D.Wein Ltd | Construction | 2024 |
| D2 Glass Solutions Ltd | Construction | 2012 |
| D28 Properties Ltd | Real estate | 2026 |
| D4 Connect Estate Ltd | Real estate | 2026 |
| DA Vinci Construction Ltd | Professional & scientific | 1989 |
| DA Vinci Properties (Brompton) Limited | Real estate | 2003 |
| DA Vinci Properties (Gravesend) Limited | Real estate | 2006 |
| DA Vinci Properties (Maidstone) Limited | Construction | 2000 |
| DA Vinci Properties (Management) Ltd | Construction | 2005 |
| DA Vinci Properties Limited | Real estate | 1994 |
| Daad Enterprise Limited | Other services | 2002 |
| Dablepee Limited | Health & social care | 2022 |
| Dabor International Ltd | Transport & logistics | 2026 |
| Daddy Bear Grills Limited | Hospitality | 2024 |
| Dadspace CIC | Other services | 2022 |
| Daedalus Environmental Limited | Administrative & support | 2009 |
| Daily Studio Ltd | Information & communication | 2024 |
| Dairick Limited | Real estate | 2024 |
| Daisy & Co Limited | Other services | 2013 |
| Dajel Property Limited | Real estate | 2024 |
| DAL Installations Ltd | Administrative & support | 2022 |
| Dalcon Superprime Limited | Construction | 2013 |
| Dale Brickwork Ltd | Construction | 2020 |
| Daliq-Em-Ganev Limited | Transport & logistics | 2019 |