| Coulston Estates Limited | Real estate | 2011 |
| Cousins & Co Properties Limited | Real estate | 2019 |
| Cousins & Co Short Stays Limited | Real estate | 2025 |
| Cowlick Limited | Other services | 2024 |
| CP Books Limited | Wholesale & retail | 2013 |
| CPJ Garden Services Ltd | Administrative & support | 2023 |
| Crockham Hill Amenities C.I.C. | Other services | 2015 |
| Crockham Hill CIC | Information & communication | 2012 |
| Crockham Park Limited | Administrative & support | 1994 |
| Crossfire Productions Ltd | Information & communication | 2009 |
| Crowhurst Marine Ltd | Manufacturing | 2017 |
| CSJ Clarke Engineering Services Ltd | Professional & scientific | 2014 |
| CT Property Management Ltd | Households | 2023 |
| Curran IT & Electrical Services Limited | Manufacturing | 2003 |
| Curran Packaging Company Limited | Manufacturing | 1980 |
| CW Golf Experiences Ltd | Arts & recreation | 2025 |
| D&G Asset Management Ltd | Real estate | 2024 |
| D&G Asset Management Property I Ltd | Real estate | 2026 |
| D. M. D. Graphic Services Limited | Other services | 1998 |
| D. P. Storrier Limited | Wholesale & retail | 1968 |
| Dalber Limited | Other services | 2016 |
| Dancekids Ltd | Administrative & support | 2008 |
| Dangerous Minds Creative Ltd | Professional & scientific | 2009 |
| Daniel Lilley Carpentry & Joinery Ltd | Manufacturing | 2020 |
| Danko Electrical Services Ltd | Construction | 2014 |
| Darts Regulation Authority | Other services | 2002 |
| Darwin Private Equity Friends and Family Fund LP | | 2007 |
| Darwin Private Equity Holdings Ltd | Financial services | 2012 |
| Darwin Private Equity I LP | | 2007 |
| Darwin Private Equity LLP | | 2006 |
| Data Driven Software Solutions Limited | Real estate | 2024 |
| Davebiggs Limited | Public administration | 2015 |
| David Yardley Limited | Information & communication | 1978 |
| Daycare SOS Limited | Health & social care | 2019 |
| DBA Process Consultants Limited | Administrative & support | 2006 |
| DBA Risk Management Limited | Administrative & support | 1997 |
| DCS Structural Limited | Professional & scientific | 2015 |
| Death Star Properties Ltd | Financial services | 2018 |
| Deaton Limited | Other services | 1980 |
| DEB and Tris Properties Limited | Real estate | 2022 |
| DEC Metrics Limited | Information & communication | 2011 |
| Decorus Developments Limited | Construction | 2021 |
| Decorus Estates Limited | Real estate | 2020 |
| Decorus Investments Limited | Administrative & support | 2007 |
| Decorus London Limited | Wholesale & retail | 2007 |
| Dekota Advisory Ltd | Professional & scientific | 2026 |
| Deluxe Digital Limited | Professional & scientific | 2016 |
| Demida Design & Development Limited | Construction | 2007 |
| Dennison Consultancy Services Ltd | Professional & scientific | 2015 |
| Dermis Glow UK Limited | Wholesale & retail | 2024 |
| Design Boss Diary Ltd | Professional & scientific | 2024 |
| DETAIL2DETAIL Limited | Administrative & support | 2025 |
| Diccon Driver Creative Services Ltd | Professional & scientific | 2024 |
| DID Holdings Ltd | Financial services | 2024 |
| Didi House Ltd | Real estate | 2023 |
| Didi London Ltd | Wholesale & retail | 2015 |
| Digital Image Foundry Limited | Information & communication | 1994 |
| Digitalbusinesssoltions UK Ltd | Professional & scientific | 2025 |
| Dilek Ltd | Hospitality | 2024 |
| Dilnot Property Limited | Real estate | 2023 |
| Dimond Holdings Limited | Wholesale & retail | 2015 |
| DJC Flooring Limited | Construction | 2003 |
| DJS Engineering Maintenance Ltd | Manufacturing | 2019 |
| DMS Investments Limited | Construction | 1985 |
| Dolphin Accountancy Ltd | Professional & scientific | 2014 |
| Domus Wealth Partners Limited | Financial services | 2025 |
| DON White Consultancy Limited | Construction | 2020 |
| Dorset Food Production Services Ltd | Other services | 2025 |
| Dovepride Investments Limited | Real estate | 2002 |
| DPC in Greenwich Limited | Professional & scientific | 2002 |
| DR Anthony Williams Ltd | Professional & scientific | 2024 |
| DR J Gupta Pathology Limited | Health & social care | 2026 |
| Drouin Consulting Limited | Professional & scientific | 2023 |
| DSL Scaffolding Limited | Construction | 2002 |
| Dsncs Ltd | Professional & scientific | 2011 |
| Dsol Limited | Real estate | 2023 |
| Dunbrevan Limited | Administrative & support | 2016 |
| Dunning Computer Services Limited | Wholesale & retail | 2001 |
| Dutch Spaghetti Software Ltd | Information & communication | 2026 |
| Duyen Sky Nails Ltd | Other services | 2021 |
| DWG Motorsport Limited | Arts & recreation | 2023 |
| DWG Plant and Hire Limited | Administrative & support | 2013 |
| DWG Scaffolding & Brickwork Limited | Construction | 2012 |
| Dyad Consulting Ltd | Professional & scientific | 2023 |
| E G L Developments Limited | Real estate | 2002 |
| E.E. Lane & Sons (Holdings) Limited | Real estate | 1958 |
| E2 Technical Limited | Energy | 2018 |
| EAL Consulting Limited | Professional & scientific | 2023 |
| Ealadhach Ltd | Professional & scientific | 2018 |
| East Hill Court (Oxted) Limited | Real estate | 2008 |
| Eastlords Family Office Limited | Administrative & support | 2006 |
| Eastlords Limited | Other services | 1982 |
| Easystore (Holdings) Ltd | Financial services | 2019 |
| Easystore Southwest Ltd | Transport & logistics | 2019 |
| Eccemonde Limited | Information & communication | 2013 |
| Eclipse Roofing Contractors Limited | Construction | 2024 |
| Eco Matrix Construction Ltd | Construction | 2019 |
| ED Ferris Consultancy Limited | Professional & scientific | 2022 |
| Eden Meadow Conservation Company Limited | Other services | 2021 |
| Edge Ahead Media Limited | Professional & scientific | 2025 |