| Denmark Forrester Limited | Professional & scientific | 2003 |
| Dennicci Ltd | Extraterritorial | 2021 |
| Denny Wright Photography Ltd | Professional & scientific | 2022 |
| Desch Plantpak Limited | Manufacturing | 1964 |
| Design EFP Ltd | Professional & scientific | 2018 |
| Designhire Ltd | Administrative & support | 2026 |
| Desilco Consulting Limited | Wholesale & retail | 2012 |
| Devtryx Holdings Ltd | Financial services | 2021 |
| Devtryx Limited | Information & communication | 2007 |
| DF Secretarial Services Limited | Professional & scientific | 2008 |
| DGF Racing Limited | Arts & recreation | 2024 |
| DGM Online UK Limited | Wholesale & retail | 2021 |
| Dgpc Barber Ltd | Other services | 2023 |
| DI Water LLP | | 2024 |
| Diamond Press Holdings Limited | Financial services | 2025 |
| Diamond Windows and Conservatories Limited | Construction | 2016 |
| Digital Evolution Consulting Ltd | Professional & scientific | 2021 |
| Digital RF Installation and Support Services Limited | Manufacturing | 2024 |
| Digitalgiraffe Ltd | Information & communication | 2020 |
| Dino Gavanni Ltd | Wholesale & retail | 2024 |
| Dirty Velvet Limited | Manufacturing | 2003 |
| Dirtypaws Dog Grooming Ltd | Agriculture & fishing | 2026 |
| Discount Cleaning Products (Essex) Ltd | Wholesale & retail | 2025 |
| Discreet Pest Management Limited | Administrative & support | 2003 |
| Dixiebell Investments Limited | Real estate | 2017 |
| DJ Optimal Ltd | Professional & scientific | 2020 |
| DJK (Internet) Limited | Information & communication | 2015 |
| DJK (Renovations) Limited | Construction | 2015 |
| DJM Properties (Essex) Limited | Real estate | 2011 |
| DJS Traditional Art Promotions Ltd | Arts & recreation | 2009 |
| DKL Cleaning Solutions Limited | Administrative & support | 2024 |
| DL Wills LLP | | 2024 |
| DLA Group Ltd | Financial services | 2025 |
| Dlux Spa Ltd | Other services | 2023 |
| DMS Custom Fabrications Ltd | Manufacturing | 2013 |
| Docking Estate Management Limited | Households | 2022 |
| DOE Holdings Limited | Professional & scientific | 2016 |
| DOE Management Limited | Extraterritorial | 1983 |
| Donald Homes Limited | Real estate | 2016 |
| Door Frames and Kits Limited | Manufacturing | 2025 |
| Doorman Services Limited | Administrative & support | 2014 |
| DOT4 Marketing Limited | Professional & scientific | 2018 |
| Doug Phillips Holdings Limited | Professional & scientific | 2007 |
| Doug Phillips Limited | Manufacturing | 2005 |
| Douglas Motor Cycles Limited | Arts & recreation | 1998 |
| Downs Road Maldon Ltd | Construction | 2018 |
| Doxfx Ltd | Wholesale & retail | 2024 |
| Doyenne Law Limited | Administrative & support | 2017 |
| Doyle Sails Solent Ltd | Manufacturing | 1997 |
| DPS Forestry & Land Management Limited | Agriculture & fishing | 2014 |
| DPS Property Mgmt Limited | Real estate | 2022 |
| Dragonstone Outdoor Services Ltd | Administrative & support | 2025 |
| Drain AID Limited | Administrative & support | 1998 |
| Drapers Farm Sports Club | Arts & recreation | 2019 |
| Drax Cloudops Limited | Information & communication | 2026 |
| Drax Investments Limited | Construction | 2016 |
| Dreamboxx Productions Ltd | Information & communication | 2014 |
| Dreams Work Interiors Ltd | Construction | 2021 |
| Dress the Home Property Staging Ltd | Administrative & support | 2025 |
| Driver & Sons Limited | Construction | 2005 |
| Droptop USA Group Ltd | Financial services | 2026 |
| DRP Groundworks Ltd | Construction | 2024 |
| Drury Windows Limited | Manufacturing | 2003 |
| DS Mill Road Property Limited | Real estate | 2025 |
| DSB Architecture Limited | Professional & scientific | 2017 |
| DSB Property Designs Limited | Professional & scientific | 2008 |
| DSL Consulting Services Ltd | Professional & scientific | 2024 |
| Dsrs Services Limited | Manufacturing | 2017 |
| DSW Contractors Ltd | Construction | 2018 |
| DUB Restaurants Ltd | Hospitality | 2019 |
| Duck Nail Studio Ltd | Other services | 2026 |
| Dukes Park Automotive Limited | Wholesale & retail | 2014 |
| Duncan Beattie IT Ltd | Information & communication | 2017 |
| Dunn Builders & Contractors Limited | Construction | 2026 |
| Dunward Battersea Rise Ltd | Construction | 2014 |
| Dunward Chesterfield Grove Limited | Real estate | 2017 |
| Dunward Investments Limited | Real estate | 2003 |
| Dunward Kelsey House Limited | Real estate | 2024 |
| Dunward Lordship Lane Ltd | Construction | 2013 |
| Dunward Properties Limited | Real estate | 2000 |
| Dunward Tooting Limited | Real estate | 2016 |
| Dunward Upper Richmond Road Ltd | Real estate | 2015 |
| Dunward York Road Limited | Real estate | 2014 |
| Dupond Collective Limited | Arts & recreation | 2026 |
| DVS Construction Services Limited | Construction | 2020 |
| DW Access Ltd | Other services | 2016 |
| DWS Building Contractors Limited | Extraterritorial | 2017 |
| Dynamic Movement Therapy Ltd | Health & social care | 2021 |
| Dyslexia Expertise Limited | Education | 2017 |
| E a Wiseman Holdings Limited | Real estate | 2020 |
| E a Wiseman Properties Limited | Construction | 2020 |
| E L Nail School Limited | Professional & scientific | 2023 |
| E-Saber Trading Company Limited | Administrative & support | 2021 |
| E.A.Lane (North Lynn) Limited | Agriculture & fishing | 1949 |
| E.B.Mills Property Co.Limited | Real estate | 1963 |
| E.J.Taylor & Sons (Coggeshall) Limited | Construction | 2020 |
| E50K Strategic Advisory Limited | Professional & scientific | 2021 |
| East of England Broadband Network | Education | 2003 |
| East Seneca Consulting Limited | Professional & scientific | 2025 |
| East West Associates Limited | Professional & scientific | 2025 |