| CRW Housing Ltd | Real estate | 2018 |
| Crystal Orchid Ltd | Health & social care | 2023 |
| Crystalnet Technologies Ltd | Information & communication | 2017 |
| CS Courier Solution Ltd | Transport & logistics | 2020 |
| CS Mitchell Renovation Ltd | Construction | 2025 |
| CS PPM Limited | Construction | 2017 |
| Csaj Limited | Professional & scientific | 2017 |
| CSC Contract Ltd | Administrative & support | 2011 |
| CSL Motorworks Ltd | Administrative & support | 2020 |
| CSM Project Management Ltd | Professional & scientific | 2012 |
| CTG Taxi Ltd | Transport & logistics | 2024 |
| CTM Refurbishments Limited | Construction | 2012 |
| CTN Shipping Ltd | Transport & logistics | 2019 |
| Ctrl Lighting Ltd | Construction | 2021 |
| CTX4 Ltd | Information & communication | 2023 |
| Cuan Legal Services Limited | Professional & scientific | 2023 |
| Cubitt & Nash Limited | Real estate | 2010 |
| Cudi Technologies Limited | Information & communication | 2024 |
| Cuditech Services Ltd | Professional & scientific | 2025 |
| Culena Skin Ltd | Other services | 2025 |
| Cultiva Europe Ltd | Wholesale & retail | 1998 |
| Cunningham & Plant Services Ltd | Construction | 2023 |
| Curated Destination Solutions Ltd | Professional & scientific | 2025 |
| Curiouser Limited | Professional & scientific | 2013 |
| Curly OWL Party Ltd | Wholesale & retail | 2025 |
| Current Investments Limited | Real estate | 2020 |
| Cutting Edge Decorating Services Limited | Professional & scientific | 1998 |
| Cutting Edge Double Glazing Repairs Ltd | Construction | 2023 |
| Cuxton 91 | Arts & recreation | 2021 |
| Cuxton Marina Group Limited | Professional & scientific | 2005 |
| Cuxton Marina Limited | Transport & logistics | 1997 |
| Cuxton Road Management Company Limited | Real estate | 2000 |
| Cvminder Limited | Extraterritorial | 2011 |
| Cwrw Services Ltd | Administrative & support | 2024 |
| Cwtrdz Ltd | Financial services | 2025 |
| CYA Consulting Ltd | Financial services | 2018 |
| Cybasics Estate Ltd | Real estate | 2023 |
| Cybasics Ltd | Information & communication | 2017 |
| Cyber Centre of Excellence Limited | Wholesale & retail | 2023 |
| Cyber Composites Ltd | Construction | 2014 |
| Cyberconsultancy Limited | Information & communication | 2018 |
| Cycle Management Solutions Limited | Professional & scientific | 2014 |
| Cycling Interval Ltd | Other services | 2019 |
| Cyril Sense Health Care Solutions Limited | Extraterritorial | 2024 |
| Cyrus Estates Limited | Real estate | 2021 |
| D & a Contractors (Kent) Limited | Construction | 2023 |
| D & a Toys (Chatham) Limited | Wholesale & retail | 2002 |
| D & D Waste Recovery Limited | Transport & logistics | 2011 |
| D & J Contracts Southern Limited | Construction | 2010 |
| D & J Motor Services Limited | Wholesale & retail | 2009 |
| D & P Utilities Ltd | Construction | 2015 |
| D & S Fleming (Sussex) Limited | Construction | 2005 |
| D & T Carpentry Ltd | Construction | 2016 |
| D - Pendant Limited | Wholesale & retail | 1988 |
| D B Building (Kent) Ltd | Construction | 2020 |
| D Boichat Ltd | Construction | 2021 |
| D Card Consulting Limited | Administrative & support | 2025 |
| D Clarke Builders & Developers Limited | Real estate | 1998 |
| D Clarke Builders Limited | Construction | 2017 |
| D Dawkins Limited | Financial services | 2020 |
| D DOT Carpentry Limited | Construction | 2025 |
| D Hilton Plastering Limited | Construction | 2008 |
| D I Ivanov Ltd | Construction | 2022 |
| D Johnson Fire Protection Ltd | Construction | 2016 |
| D L Drylining ( Medway ) Ltd | Construction | 2014 |
| D Mahmoud Ltd | Real estate | 2024 |
| D R W Networks Limited | Construction | 2001 |
| D W Penfold Site Services Limited | Administrative & support | 2011 |
| D W Taylor Home Renovations Ltd | Construction | 2025 |
| D West Roofing Ltd Limited | Construction | 2022 |
| D&J Multi-Enterprise Limited | Manufacturing | 2020 |
| D&J Properties Development Ltd | Real estate | 2026 |
| D&M Pipe Fitting & Fabrication Limited | Construction | 2017 |
| D&S Construction Building & Electrical Services South-East Ltd | Construction | 2022 |
| D&Y Courier Ltd | Transport & logistics | 2022 |
| D'Akins Builders Limited | Construction | 2015 |
| D-Live! CIC | Arts & recreation | 2018 |
| D.A. Printers Limited | Manufacturing | 1972 |
| D.J.F Plastering&Building Ltd | Construction | 2025 |
| D.M. Hardy Electrical Services Ltd | Energy | 2008 |
| D.Peck Construction Limited | Professional & scientific | 2014 |
| D.S.O. Installations Ltd | Construction | 2013 |
| D.T.G. Elliott & SON Limited | Agriculture & fishing | 1934 |
| D2 Facilities Limited | Other services | 2016 |
| D2 Maintenance Ltd | Extraterritorial | 2023 |
| D2 Property Management Limited | Real estate | 2020 |
| Daam Ltd | Wholesale & retail | 2026 |
| Dabar Homes Ltd | Real estate | 2025 |
| Dabar Security Ltd | Information & communication | 2020 |
| Dabros Accounting Limited | Professional & scientific | 2014 |
| Dadiva London Limited | Other services | 2012 |
| Dadiva Properties Limited | Real estate | 2014 |
| Dafinat Property Ltd | Real estate | 2021 |
| Dafinat Property Management Limited | Real estate | 2023 |
| DAG Inter Limited | Wholesale & retail | 2011 |
| Dagwan Enterprises Limited | Construction | 2015 |
| Dairy Fields Management Company Limited | Households | 2023 |
| Daiva's Property Ltd | Real estate | 2025 |
| Dakota Lillies Ltd | Other services | 2025 |
| Daksi International Ltd | Wholesale & retail | 2019 |