| DMC Magic Limited | Arts & recreation | 2010 |
| DMD Visuals Ltd | Construction | 2025 |
| Dmdts Strategic Solutions Limited | Information & communication | 2013 |
| Dmfm Holdings Ltd | Financial services | 2026 |
| DMS Holdings Limited | Professional & scientific | 1997 |
| DMS Plant & Vehicle Ltd | Manufacturing | 2016 |
| Dn&B Ltd | Households | 2019 |
| DN3 Holdings Limited | Professional & scientific | 2025 |
| DND Marketing Ltd | Administrative & support | 2024 |
| DNX Nest Ltd | Wholesale & retail | 2024 |
| Dobern Properties Limited | Real estate | 1969 |
| Dobern Property Management Limited | Real estate | 2020 |
| Dockspot UK Limited | Administrative & support | 2010 |
| Doctor J Investments Ltd | Real estate | 2022 |
| Doctor J Ltd | Health & social care | 2020 |
| Doctorology Limited | Administrative & support | 2021 |
| Dodgy Holiday Tours Limited | Administrative & support | 2006 |
| Dog Republic Ltd | Hospitality | 2025 |
| Dogtastic ST Albans Limited | Other services | 2016 |
| DOL Investments Limited | Real estate | 2019 |
| Dolce & Delicious Ltd | Manufacturing | 2021 |
| Dolce Bite Ltd | Hospitality | 2019 |
| Dolphin Investment Growth Ltd | Hospitality | 2021 |
| Domo Construction Ltd | Construction | 2018 |
| Domus CV Limited | Information & communication | 2026 |
| Domusea (Alfriston) Limited | Construction | 2023 |
| Domusea (Pagham) Limited | Construction | 2016 |
| Domusea (Plaistow) Limited | Construction | 2024 |
| Domusea (Strategic) Limited | Construction | 2017 |
| Domusea (Westbourne) Limited | Construction | 2024 |
| DON Charles Boxing Ltd | Professional & scientific | 2023 |
| Donaa Homes Ltd | Real estate | 2019 |
| Donatantonio Group Limited | Financial services | 2007 |
| Donlan Associates Ltd | Information & communication | 2019 |
| Donnini Online.Co.Uk Ltd | Hospitality | 2018 |
| Donnton Abbey Estates Ltd | Real estate | 2019 |
| Doolittle Investments Limited | Real estate | 2016 |
| Dope Furniture Ltd | Construction | 2024 |
| Dorchester Gardens Properties Limited | Construction | 2014 |
| Dore Landscapes Ltd | Construction | 2008 |
| Doron Ltd | Other services | 2018 |
| Dorsa Ltd | Hospitality | 2016 |
| Dotdot Caci Limited | Professional & scientific | 2015 |
| Double Impact IT Solutions Ltd | Information & communication | 2013 |
| DOUBLE8 DOUBLE8 Group Limited | Professional & scientific | 2010 |
| Doughnuty Limited | Manufacturing | 2023 |
| Douglass Services Limited | Professional & scientific | 2025 |
| Dover Education Group Limited | Financial services | 2022 |
| Downing Projects and Solutions Ltd | Information & communication | 2012 |
| Downs Property Solutions Limited | Other services | 2012 |
| DP Properties NE Ltd | Real estate | 2021 |
| DP45 Limited | Real estate | 2024 |
| Dpan Limited | Construction | 2025 |
| DPK Properties Ltd | Real estate | 2011 |
| Dpsych Limited | Health & social care | 2024 |
| DPW Electrical Services Ltd | Construction | 2019 |
| DR a Aesthetics Ltd | Health & social care | 2016 |
| DR a LOH Ltd | Health & social care | 2022 |
| DR a Malik Ltd | Health & social care | 2020 |
| DR a R Holdings Limited | Real estate | 2019 |
| DR a Stanton & Co Ltd | Health & social care | 2023 |
| DR Dacosta SKN Limited | Health & social care | 2023 |
| DR Gloria Dura-Vila Autism Specialist Ltd | Health & social care | 2019 |
| DR Kempny Ltd | Health & social care | 2022 |
| DR L S Collins Ltd | Health & social care | 2015 |
| DR Magneto Ltd | Information & communication | 2022 |
| DR Mittal Patel Ltd | Health & social care | 2025 |
| DR MT Said Ltd | Professional & scientific | 2020 |
| DR S J Razak Ltd | Health & social care | 2014 |
| DR Saqib Ahmed Ltd | Health & social care | 2023 |
| DR Sheena George Limited | Real estate | 2021 |
| DR Smith Medicolegal Limited | Health & social care | 2018 |
| DR Tahmina Pearsall Limited | Health & social care | 2020 |
| DR Tara Tricot Ltd | Health & social care | 2026 |
| DR Uzma Abedi Aesthetics Ltd | Health & social care | 2023 |
| DR V P Samy Ltd | Health & social care | 2014 |
| DR V Ratheesh Ltd | Health & social care | 2016 |
| DR V Tyagi Limited | Health & social care | 2023 |
| DR. Elakeche Ella Ltd | Health & social care | 2023 |
| DR. Hanieh Dental & Aesthetics Ltd | Health & social care | 2022 |
| Draconem Ltd | Arts & recreation | 2017 |
| Dragan Building Ltd | Construction | 2018 |
| Dragonpearl (UK) Limited | Information & communication | 2006 |
| Dram Wise Consulting Limited | Professional & scientific | 2026 |
| Drama Limited | Real estate | 2018 |
| Dravilo Limited | Professional & scientific | 2025 |
| Draylodge Limited | Construction | 1983 |
| Dream Space Films Ltd | Information & communication | 2024 |
| Dreamview Management Limited | Real estate | 2011 |
| Drensin Limited | Professional & scientific | 2018 |
| Dresswise Limited | Wholesale & retail | 2012 |
| Drgp Ltd | Health & social care | 2023 |
| Drivegate Properties Limited | Construction | 1981 |
| Driver DRY Lining Ltd | Construction | 2025 |
| Driver Estates Ltd | Real estate | 2024 |
| Driverconstructionn Ltd | Construction | 2025 |
| DRIVERS70 Ltd | Transport & logistics | 2021 |
| Drivestone Driveways & Patios Limited | Construction | 2014 |
| Drivestone Paving & Landscaping Limited | Construction | 2015 |
| Drub Health Ltd | Health & social care | 2026 |