| Digital Adaptation Limited | Information & communication | 2004 |
| Digital Cactus Limited | Information & communication | 2017 |
| Digital Kove Ltd | Information & communication | 2019 |
| Digital Macro Strategy Ltd | Financial services | 2023 |
| Digital Sports Group Limited | Professional & scientific | 2009 |
| Digital Sports Rights Limited | Administrative & support | 2009 |
| Dinkov Limited | Administrative & support | 2016 |
| Dino Estates Ltd | Real estate | 2020 |
| Dipo Limited | Other services | 2013 |
| Direct Dental Hygienists Limited | Health & social care | 2013 |
| Direct Editions Ltd | Wholesale & retail | 2009 |
| Direct Equipment Supplies (UK) Limited | Transport & logistics | 1999 |
| Direct Mortgage Network Ltd | Financial services | 2018 |
| Direct Phone Limited | Wholesale & retail | 2026 |
| Direct Traders Ltd | Wholesale & retail | 2012 |
| Discount SW Limited | Wholesale & retail | 2019 |
| Discovery Educational Trust | Education | 2011 |
| Discreet Muse Ltd | Other services | 2019 |
| Discus Fire Protection Limited | Public administration | 2026 |
| Discus Thermal Limited | Construction | 2021 |
| Disley Insulation Services Ltd | Construction | 2022 |
| Disney Bear Bell LLP | | 2021 |
| Dissonance Holdings Limited | Arts & recreation | 2015 |
| Divine LUK Group Ltd | Construction | 2026 |
| DJ Gibbs Datacom Limited | Information & communication | 2007 |
| DJ Gregory Consultants Ltd | Professional & scientific | 2022 |
| DJ Investments (Essex) Ltd | Real estate | 2024 |
| Djhr Limited | Administrative & support | 2015 |
| DJM Roofing Ltd | Construction | 2012 |
| Djta Ltd | Professional & scientific | 2024 |
| DK (Specialist) Cleaning Services Ltd | Administrative & support | 2018 |
| DK Residential Care Ltd | Health & social care | 2025 |
| DK Woodland Limited | Hospitality | 2018 |
| DLC Group Limited | Water & waste | 2024 |
| Dlgm Limited | Real estate | 2022 |
| DLS Autos Limited | Wholesale & retail | 2018 |
| Dltn Training & Consultancy Ltd | Professional & scientific | 2026 |
| DM Delights Limited | Hospitality | 2018 |
| DM Price Ltd | Professional & scientific | 2020 |
| Dmaac Ltd | Real estate | 2025 |
| DMB ADS Ltd | Professional & scientific | 2023 |
| DMC Industrial Covers Limited | Manufacturing | 2026 |
| Dmcm Limited | Administrative & support | 2004 |
| DMH Contractors Limited | Administrative & support | 2013 |
| DMH Management (UK) Ltd | Professional & scientific | 2019 |
| DMS Building Consultancy Ltd | Professional & scientific | 2020 |
| DMT Homes Ltd | Real estate | 2018 |
| Dnel Ltd | Transport & logistics | 2014 |
| Docklands Property Maintenance Ltd | Households | 2021 |
| Docklands Taxis Rentals Ltd | Other services | 2014 |
| Doclibrary Ltd | Information & communication | 2025 |
| Dodge Consultants Ltd. | Information & communication | 2012 |
| Dog Services GB Limited | Other services | 2020 |
| Dogs Dholaks Limited | Wholesale & retail | 2002 |
| Dojo Supplies Limited | Arts & recreation | 2013 |
| DOK 82 Ltd | Wholesale & retail | 2014 |
| Dolliemaysx Limited | Wholesale & retail | 2021 |
| Dolomite Real Estate Ltd. | Real estate | 2018 |
| Dolphin IT Support & Consulting Services Limited | Information & communication | 2019 |
| Dolron Properties Ltd | Real estate | 2023 |
| Domestic Appliances Care Limited | Other services | 2025 |
| Dominate Ltd | Wholesale & retail | 2023 |
| Domo Construct Ltd. | Construction | 2013 |
| Domu Property Investment Ltd | Hospitality | 2025 |
| Don'T POP That Spot Ltd | Wholesale & retail | 2022 |
| Don'T Tell Aunty Limited | Hospitality | 2024 |
| Donetech Ltd | Information & communication | 2023 |
| Doodle Art Craft and Design Ltd | Manufacturing | 2025 |
| Doolhof Wine Estates (PTY) Ltd | Manufacturing | 2022 |
| Doors 4 Inspection Limited | Public administration | 2025 |
| Dormetric Ltd | Construction | 2022 |
| Dose 92 Ltd | Wholesale & retail | 2022 |
| Dotprint Ltd | Manufacturing | 2007 |
| Double OR Nothing Socials Limited | Information & communication | 2024 |
| Doublem Playcentres Ltd | Arts & recreation | 2012 |
| Doug Sherry (Heathrow) Limited | Hospitality | 1997 |
| Dove Property Solutions Ltd | Real estate | 2019 |
| Dovecliff Management Ltd | Administrative & support | 2023 |
| Doves and SON Developments Limited | Real estate | 2021 |
| Dowden Holdings Limited | Construction | 2022 |
| Doyel Care Ltd | Health & social care | 2025 |
| DP Water Solutions Limited | Water & waste | 2016 |
| DPB Properties Ltd | Real estate | 2021 |
| DR Derma Co Ltd | Wholesale & retail | 2025 |
| DR J. Educational Psychology Services Ltd | Education | 2023 |
| DR Management Consulting Limited | Administrative & support | 2017 |
| DR Sinth Aesthetics Ltd | Health & social care | 2025 |
| DR. Switch Ltd | Construction | 2022 |
| DR. Vanessa Salih Limited | Professional & scientific | 2021 |
| Dragon SON Two Limited | Hospitality | 2025 |
| DRC Electrical Ltd | Construction | 2026 |
| Dream Bathroom Installations Limited | Construction | 2021 |
| Dream Point Homes Limited | Administrative & support | 2014 |
| Dream Weaver Properties Limited | Real estate | 2025 |
| Dreemspace Ltd | Construction | 2026 |
| Drinks Europe Ltd | Wholesale & retail | 2018 |
| Drip & SIP Limited | Wholesale & retail | 2025 |
| Driscolls Building and Carpentry Services Limited | Construction | 2011 |
| Drive Aware Limited | Wholesale & retail | 2019 |
| Driveline Drivers Limited | Construction | 2002 |