| DOM and ASH Property Services Ltd | Real estate | 2023 |
| Domainmaster Limited | Information & communication | 1998 |
| Domestic Heating Team Ltd | Construction | 2018 |
| Dominic James (Holdings) Limited | Real estate | 2012 |
| Dominic James Consulting Limited | Professional & scientific | 2002 |
| Dorie Simmonds Agency Limited | Administrative & support | 2011 |
| Dorodango Ltd | Professional & scientific | 2026 |
| Dorset Cat Care Limited | Administrative & support | 2025 |
| DOT Eco Limited | Professional & scientific | 2012 |
| Dovevalley Care Ltd | Administrative & support | 2022 |
| Dovrill Limited | Real estate | 1984 |
| Downtown Designs Limited | Professional & scientific | 2023 |
| Dowsetts Classic Car Co Limited | Wholesale & retail | 2015 |
| DPK Maintenance Limited | Construction | 2022 |
| Dpsa Developments Ltd | Real estate | 2014 |
| Dpsa Group Ltd | Professional & scientific | 2010 |
| Dpsa Properties LLP | | 2009 |
| DR Christopher Broyd Limited | Health & social care | 2024 |
| DR Gardiner Limited | Financial services | 2015 |
| DR Graeme Oconnor Dietitian Ltd | Health & social care | 2025 |
| DR L Rozewicz Psychiatry Ltd | Health & social care | 2022 |
| Dr.Waffle Ltd | Hospitality | 2022 |
| Dragen Homes Limited | Real estate | 2017 |
| Draghici Build Ltd | Construction | 2025 |
| Dragonvet Consulting Limited | Professional & scientific | 2019 |
| Drain Tech Solutions Limited | Water & waste | 2025 |
| Draincare Environmental Services Limited | Administrative & support | 2020 |
| Draincare Ltd | Water & waste | 2018 |
| Draincare Property Ltd | Real estate | 2019 |
| Draincare Services Limited | Extraterritorial | 2020 |
| Dreamality Pictures Limited | Information & communication | 2004 |
| Dress IT Yourself Ltd | Other services | 2011 |
| DRG Contractors Ltd | Construction | 2025 |
| Drivenetwork Ltd | Wholesale & retail | 2025 |
| DRM Environmental Ltd | Water & waste | 2020 |
| Drogheda Property Limited | Real estate | 2017 |
| Drupalcamp England CIC | Administrative & support | 2025 |
| DRX Ember & Co Ltd | Wholesale & retail | 2026 |
| DSA Bookkeeping Limited | Professional & scientific | 2018 |
| Dsag Autobody Paintshop Limited | Wholesale & retail | 2021 |
| DSC Joinery Limited | Construction | 2019 |
| DSW Consultants Ltd | Professional & scientific | 2022 |
| DT Printing Limited | Manufacturing | 2009 |
| DTS Group Ltd | Transport & logistics | 2018 |
| DTV Construction Ltd | Construction | 2019 |
| DU Cros Court Management Co. Limited | Households | 1994 |
| Duct & Vent Ltd | Manufacturing | 2011 |
| Duct FAB Limited | Manufacturing | 2023 |
| Duct Systems Limited | Administrative & support | 2003 |
| Dukes Farm (Chelmsford) Management Company Limited | Households | 1984 |
| Dumdrum Leisure Ltd | Hospitality | 2024 |
| Dunkirks Management Company Limited | Households | 1990 |
| Dunnylade Afro-Carribean Store Ltd | Wholesale & retail | 2025 |
| Dunnylade's Heritage Ltd | Hospitality | 2020 |
| Duohives Ltd | Information & communication | 2025 |
| Dupey Builders Limited | Construction | 2020 |
| Dupey Investments Limited | Real estate | 2020 |
| Dura Residential Limited | Real estate | 2020 |
| Dusters Cleaning Limited | Administrative & support | 2003 |
| DX3P Ltd | Arts & recreation | 2025 |
| Dynactic Limited | Manufacturing | 2022 |
| Dynamic AV Integration Limited | Administrative & support | 2025 |
| E & a Metal Recycling Limited | Manufacturing | 2025 |
| E - Scapes - Landscapes Ltd | Administrative & support | 2017 |
| E-Lectrik Engineering Ltd | Construction | 2024 |
| E.F. Meering Limited | Real estate | 1938 |
| E80 Group Ltd | Administrative & support | 2007 |
| Earthworks Enterprise Limited | Information & communication | 2024 |
| Easigardens Limited | Administrative & support | 2026 |
| East Grinstead Management Company Limited | Professional & scientific | 2018 |
| East Herts Creates CIC | Education | 2024 |
| East Herts Investments Limited | Administrative & support | 2018 |
| East Herts Self Defence Education Limited | Education | 2016 |
| Eastern Counties Straw Limited | Agriculture & fishing | 2011 |
| Eastern Services UK Limited | Construction | 1997 |
| EAV Property Group Limited | Real estate | 2025 |
| EB Property Group Limited | Real estate | 2022 |
| EBF Scaffolding Limited | Construction | 2022 |
| Ecdysis Ltd | Professional & scientific | 2017 |
| ECH2 Ltd | Health & social care | 2025 |
| ECM Creative Ltd | Arts & recreation | 2016 |
| Eco Green Plumbing and Heating Limited | Construction | 2022 |
| Eco Home Heat Pumps Ltd | Construction | 2025 |
| Eco-Green Heating & Plumbing Ltd | Construction | 2016 |
| Ecobuild Ltd | Professional & scientific | 2019 |
| Ecotech U.K. Limited | Water & waste | 2019 |
| Ecotech Worldwide Holdings Limited | Financial services | 2019 |
| Ecotrak Equipment Ltd | Wholesale & retail | 2025 |
| Ecuk Limited | Transport & logistics | 2021 |
| ED (Herts) Limited | Other services | 2019 |
| Eden Gardens and Landscapes Ltd | Administrative & support | 2015 |
| Edinburgh Way Management Company Limited | Real estate | 2019 |
| Edit Construction Ltd | Construction | 2021 |
| EDR Builders Limited | Construction | 1987 |
| EDY Logistic Ltd | Transport & logistics | 2018 |
| Effy Media Ltd. | Professional & scientific | 2017 |
| EG Property (Halstead) Limited | Real estate | 2023 |
| EGA Consulting LLP | | 2009 |
| Eighty Three Horizons Ltd | Wholesale & retail | 2025 |
| EIS Centre Limited | Professional & scientific | 2025 |