| Digitaltalc Ltd | Information & communication | 2018 |
| DIL Khush Kitchen Limited | Hospitality | 2025 |
| Dimi Ikonic Homes Ltd | Real estate | 2021 |
| Dimi Ikonic Interiors Ltd | Construction | 2026 |
| Dimore Maisonettes Limited | Real estate | 1974 |
| Dinamaco Group Limited | Wholesale & retail | 2021 |
| Dinglebrook Management Limited | Households | 1981 |
| Dinglewell Management Company Ltd | Households | 2024 |
| Dino’S Barber Shop Ltd | Other services | 2021 |
| Direct Farm Supplies Ltd | Wholesale & retail | 2010 |
| Direct Online Services Limited | Wholesale & retail | 2008 |
| Direct Plant Solutions Ltd | Manufacturing | 2021 |
| Direct Supply (UK) Limited | Wholesale & retail | 2001 |
| Direct Tyres Limited | Wholesale & retail | 2002 |
| Directors Club International Ltd | Information & communication | 2009 |
| Dirtworks Groundwork Specialists Ltd | Construction | 2018 |
| Dirty Carnivore Ltd | Manufacturing | 2025 |
| Disabled Care & Mobility Limited | Administrative & support | 2007 |
| Discusq Limited | Construction | 2009 |
| Discworld Limited | Real estate | 2025 |
| Dispersed Lubricants Limited | Professional & scientific | 2009 |
| Disturbed Visionary Ltd | Information & communication | 2022 |
| Dive Team SIX Limited | Manufacturing | 2020 |
| Divine Mercy Healthcare Recruitment Ltd | Administrative & support | 2023 |
| DIX & Co. Building Ltd | Construction | 2021 |
| Dixie DOT Crafts Limited | Arts & recreation | 2017 |
| Dixons Carpets and Flooring Ltd | Construction | 2020 |
| DJ Electrical Limited | Manufacturing | 2026 |
| DJ Engineering Solutions Ltd | Professional & scientific | 2025 |
| DJ Phonz Ltd | Arts & recreation | 2025 |
| DJ Sandy Ltd | Arts & recreation | 2025 |
| DJC Maintenance & Building Ltd | Construction | 2026 |
| DJC101 Ltd | Hospitality | 2026 |
| Djhh Investments Ltd | Real estate | 2025 |
| DJJ Healthcare Ltd | Health & social care | 2021 |
| DJL Building Contractors Services Ltd | Construction | 2026 |
| DJL Telecommunications Limited | Information & communication | 2020 |
| Djmitservices Ltd | Information & communication | 2026 |
| Djtco Accountancy LLP | | 2026 |
| Djvm Ltd | Real estate | 2022 |
| DJZ Property Service Ltd | Real estate | 2025 |
| DK Robotics Ltd | Professional & scientific | 2023 |
| DK Tech Ltd | Information & communication | 2015 |
| Dkot Ltd | Information & communication | 2022 |
| DLR Developments Ltd | Construction | 2022 |
| DMB Estates Ltd | Real estate | 2012 |
| Dmhungu Limited | Real estate | 2021 |
| Dmmed Ltd | Health & social care | 2025 |
| Dmmt Limited | Information & communication | 2022 |
| DMV Groundworks Ltd | Construction | 2025 |
| DMW Consulting Ltd | Professional & scientific | 2025 |
| DMW Holdco Limited | Financial services | 2023 |
| DND Holdings Limited | Financial services | 2002 |
| DNK Care Limited | Health & social care | 2018 |
| DNK Investments Limited | Real estate | 2025 |
| DO Lorries Ltd | Wholesale & retail | 2017 |
| Doccrs Analytics Ltd | Information & communication | 2025 |
| Docolad Healthcare Ltd | Real estate | 2023 |
| Doctor Kate Edgar Ltd | Health & social care | 2015 |
| Doddle Agency Limited | Information & communication | 2021 |
| Dodo Pubs Limited | Financial services | 2014 |
| Dog House Barbers Ltd | Other services | 2025 |
| Doge Properties Ltd | Real estate | 2022 |
| Domestic Home Helpers Ltd | Health & social care | 2022 |
| Domitex Laundry Solutions Ltd | Administrative & support | 2019 |
| Dongxing Ltd | Health & social care | 2002 |
| Dor’S Garden Ltd | Wholesale & retail | 2022 |
| DOT and DAB Spray Plastering Ltd | Construction | 2020 |
| Double Earth Limited | Real estate | 2026 |
| Double L Fast Deliveries Ltd | Transport & logistics | 2022 |
| Double N Consulting Limited | Information & communication | 2025 |
| Doug White Building Services Limited | Construction | 2012 |
| Doug' S Cafe Ltd | Hospitality | 2023 |
| Dough Mates Ltd | Hospitality | 2026 |
| Dove Construction Limited | Construction | 1993 |
| Down Ratley Glover Limited | Professional & scientific | 2018 |
| Down-To-Earth Dining Ltd | Hospitality | 2022 |
| Dowty Sports and Social Limited | Hospitality | 1999 |
| Doxey Creative Ltd | Wholesale & retail | 2016 |
| Dozen Special Projects Limited | Professional & scientific | 2020 |
| DPG Groundworks and Construction Limited | Construction | 2018 |
| DPI Property Limited | Real estate | 2018 |
| DPR Building Solutions Ltd | Construction | 2017 |
| Dprachi Resources Limited | Wholesale & retail | 2024 |
| DPS Financial Consultancy Limited | Financial services | 2009 |
| DPT (Glos) Limited | Construction | 2013 |
| DPT Cornerstone Ltd | Construction | 2016 |
| DPW Developments Limited | Construction | 2015 |
| DR G Chatzakis Ltd | Health & social care | 2015 |
| DR Halmagyi Limited | Health & social care | 2026 |
| DR Katie Alchemy Ltd | Education | 2024 |
| DR Lambert Medical Limited | Health & social care | 2013 |
| DR LI Aesthetics Ltd | Health & social care | 2021 |
| DR Wooton Ltd | Health & social care | 2025 |
| DR. Burstein & Waymore Ltd | Professional & scientific | 2021 |
| Dr.Mhp Limited | Administrative & support | 2017 |
| Draconeer Design Ltd | Manufacturing | 2026 |
| Dragon Bay Investments Ltd | Financial services | 2023 |
| Dragon Health Care Services Limited | Health & social care | 2007 |
| Dragon Wiring Limited | Manufacturing | 2026 |