| Danat Ltd | Wholesale & retail | 2021 |
| Dance Everyone CIC | Arts & recreation | 2023 |
| Dandara Eastern Limited | Construction | 2021 |
| Dani Digital Limited | Information & communication | 2021 |
| Daniel Frank Estates Ltd | Real estate | 2022 |
| Daniela Art Studio Limited | Arts & recreation | 2025 |
| Danjosh LLC Limited | Health & social care | 2016 |
| Danlec Electrical & Lighting Limited | Wholesale & retail | 2003 |
| Danny Aarons Holdings Ltd | Financial services | 2023 |
| Danny Aarons Ltd | Information & communication | 2022 |
| Danq Contractos Ltd | Construction | 2026 |
| Danu Resources Ltd | Professional & scientific | 2011 |
| Darchygroup Limited | Real estate | 2022 |
| Dark Cone Limited | Hospitality | 2018 |
| Darren Barker Washing Machines Limited | Other services | 2003 |
| Dash Compliance Consulting Limited | Professional & scientific | 2023 |
| Datacoms Projects Ltd | Information & communication | 2016 |
| Dataguide Ltd | Information & communication | 2025 |
| Datazone Direct Limited | Extraterritorial | 2015 |
| Datazone Limited | Extraterritorial | 2009 |
| David Austen Optometry Limited | Administrative & support | 2009 |
| David Syrett Packaging Consultancy Limited | Professional & scientific | 2016 |
| Davies Consultancy Ltd | Real estate | 2013 |
| DAW Built Environment Ltd | Professional & scientific | 2015 |
| Day-Taylor Construction & Property Maintenance Limited | Construction | 2017 |
| Dayton Recruitment Ltd | Administrative & support | 2023 |
| DBM (Essex) Ltd | Professional & scientific | 2020 |
| DBM Commercial Solutions Limited | Construction | 2018 |
| Dcair Limited | Real estate | 2019 |
| DCF Installations Ltd | Construction | 2026 |
| Dclothingsplug Ltd | Wholesale & retail | 2026 |
| DCM Design & Build Ltd | Construction | 2019 |
| DCM Finance Solutions Ltd | Professional & scientific | 2017 |
| Dcmg Limited | Financial services | 2009 |
| DCP Developments Limited | Construction | 2009 |
| DD Leisure Limited | Administrative & support | 2020 |
| DD Motorcycles Ltd | Wholesale & retail | 2026 |
| Ddgc Trustee Limited | Financial services | 2025 |
| Ddkao Services Ltd | Professional & scientific | 2025 |
| DE London Ltd | Professional & scientific | 2024 |
| DE Rousset-Hall Limited | Professional & scientific | 2010 |
| DE ROY Consult Limited | Professional & scientific | 2016 |
| Dealmania UK Ltd | Wholesale & retail | 2011 |
| Dean Pearcey Renovations Ltd | Construction | 2015 |
| Debabj Ltd | Wholesale & retail | 2019 |
| Dedham Rooms Ltd | Hospitality | 2018 |
| Deep Purple Limited | Extraterritorial | 1997 |
| Defence Analysis Limited | Administrative & support | 2002 |
| Defence Integration Ltd | Information & communication | 2013 |
| Definasolvo Ltd | Financial services | 2025 |
| DEK Contracts Limited | Construction | 2010 |
| Delamode Holdings Limited | Professional & scientific | 2006 |
| Delidong Limited | Arts & recreation | 2022 |
| Delilah’S Legacy Feline Rescue Ltd | Other services | 2026 |
| Delt Fire Ltd | Extraterritorial | 2025 |
| Delt Installations Limited | Energy | 2015 |
| Demos Ciclitira Limited | Wholesale & retail | 1953 |
| Denmar Medical Services Ltd | Health & social care | 2023 |
| Dennis James Lettings Ltd | Real estate | 2026 |
| Dennis Lettings Ltd | Real estate | 2026 |
| Dental Hygienics and Decontamination Limited | Manufacturing | 2010 |
| Dental Supply Chain Limited | Extraterritorial | 2013 |
| Dental Trade Network Limited | Extraterritorial | 2013 |
| DES Potter Consultancy Limited | Professional & scientific | 2021 |
| Design & Management Services Limited | Professional & scientific | 2003 |
| Destination Aesthetics & PMU Ltd | Wholesale & retail | 2023 |
| Destiny Mouldings Braintree Ltd | Manufacturing | 2018 |
| DET Holdings Limited | Financial services | 2015 |
| Detailing Direct Limited | Extraterritorial | 2008 |
| Detox Supplements Online Ltd | Wholesale & retail | 2021 |
| Deuce Team Ltd | Administrative & support | 2021 |
| DG Railtech Ltd | Information & communication | 2024 |
| DGN Building Limited | Construction | 2017 |
| DGR Property Ltd | Real estate | 2024 |
| DGV Ltd | Professional & scientific | 2025 |
| DH Accounting Solutions Limited | Professional & scientific | 2008 |
| DH Developments (Essex) Limited | Real estate | 2018 |
| DH MH Limited | Wholesale & retail | 2024 |
| DHF Marketing Ltd | Other services | 2023 |
| Diamond FUN Casino Limited | Arts & recreation | 2015 |
| Differently Enabled Ltd | Wholesale & retail | 2020 |
| DIG Deep Constructions Ltd | Construction | 2025 |
| Digger Boats Ltd | Construction | 2018 |
| Digital Noise London Limited | Administrative & support | 2022 |
| Digitalbook Ltd | Information & communication | 2017 |
| Digitaltwin.Industries Ltd | Other services | 2025 |
| Digitaltwin.Insure Ltd | Financial services | 2025 |
| Digitaltwin.Investments Ltd | Financial services | 2025 |
| Digitaltwin.Shopping Ltd | Wholesale & retail | 2025 |
| Dilina Global Limited | Wholesale & retail | 2015 |
| Dilz Ltd | Wholesale & retail | 2012 |
| Direct Contact Lifts Ltd | Manufacturing | 2018 |
| Direct Contact Technical Services Ltd | Manufacturing | 2026 |
| Direen Formwork and Site Services Ltd. | Construction | 2016 |
| Dirty Looks Ltd | Information & communication | 2010 |
| Divestment.Investments Ltd | Financial services | 2025 |
| Divine DEW Limited | Administrative & support | 2025 |
| Divitiae Aqua Ltd | Real estate | 2024 |
| DJC Developments Limited | Construction | 2017 |
| Djnb Property Limited | Real estate | 2021 |