| DLB Consult Limited | Professional & scientific | 2019 |
| DLJ Property Investments LLP | | 2004 |
| DLM Prevent and Protect Utilitys Limited | Other services | 2018 |
| DLN Project Services Ltd | Professional & scientific | 2013 |
| DLP Software Development Services Limited | Information & communication | 2018 |
| DLR Outlet Ltd | Wholesale & retail | 2024 |
| DLS Process Services Limited | Administrative & support | 2015 |
| DM & PR Balcomb Property Limited | Real estate | 2025 |
| DM Engineering (Cumbria) Limited | Professional & scientific | 2003 |
| DM Fibre Limited | Professional & scientific | 2020 |
| DM Fitness Ltd | Other services | 2020 |
| DM Highways Ltd | Construction | 2013 |
| DM Mulenga Enterprise & Engineering Limited | Professional & scientific | 2016 |
| DM Prime Ltd | Health & social care | 2020 |
| Dm-Snc Ltd | Information & communication | 2012 |
| DMB Technology Limited | Information & communication | 2008 |
| DMC Civil Engineering Limited | Construction | 2017 |
| Dmc-Qa Ltd | Administrative & support | 2025 |
| Dmclets Ltd | Real estate | 2019 |
| DMD Commerce Limited | Wholesale & retail | 2023 |
| Dmdm Wind Limited | Administrative & support | 2025 |
| DMG Dental Products (UK) Limited | Health & social care | 2008 |
| DMJ Bird UK Ltd | Transport & logistics | 2019 |
| DMJ NW Limited | Other services | 2025 |
| DMJ Properties Limited | Real estate | 2000 |
| DMJ Property Investments Limited | Real estate | 2013 |
| DMK Couriers Limited | Transport & logistics | 2020 |
| DML Automation Limited | Professional & scientific | 2022 |
| DML Parking Limited | Transport & logistics | 2025 |
| DML Properties (NW) Limited | Real estate | 2020 |
| DML Recycling Ltd | Water & waste | 2008 |
| DMM Building Limited | Construction | 2019 |
| DMM Entertainment Limited | Arts & recreation | 2023 |
| DMM Inspection Limited | Administrative & support | 2015 |
| DMP Consultancies Limited | Other services | 2021 |
| DMP Consulting Services Ltd | Administrative & support | 2023 |
| DMR Authentication Strategies Ltd | Professional & scientific | 2025 |
| DMR Properties (NW) Limited | Real estate | 2015 |
| Dmrc Limited | Professional & scientific | 2019 |
| DMS Warrington Ltd | Hospitality | 2025 |
| Dmsh Developments Limited | Construction | 2019 |
| DMT Lettings Limited | Real estate | 2018 |
| DMT Marine Limited | Other services | 2022 |
| DMU Consultancy Ltd | Professional & scientific | 2016 |
| DMW Capital Ltd | Professional & scientific | 2022 |
| DN 2ND Company Ltd | Other services | 2018 |
| DN Telecom Services Limited | Administrative & support | 2013 |
| DNA Instruments Ltd | Professional & scientific | 2020 |
| DNB Design Services Limited | Professional & scientific | 2016 |
| DNG Building Services Ltd | Construction | 2016 |
| Dnlm Origins Ltd | Wholesale & retail | 2020 |
| DNR Homes Limited | Households | 2020 |
| DO NOT Bend Productions UK Ltd | Arts & recreation | 2022 |
| Do-Well (UK) Ltd | Professional & scientific | 2014 |
| Dobbs Design Limited | Administrative & support | 2024 |
| Dobby Enterprises Limited | Extraterritorial | 2006 |
| Dobiz Global Ltd | Information & communication | 2022 |
| DOC Marine Solutions Limited | Professional & scientific | 2018 |
| Doc-Marine Limited | Manufacturing | 2020 |
| Dockeeping Limited | Administrative & support | 2023 |
| Dodder Ltd | Wholesale & retail | 2026 |
| Doeford Engineering Services Ltd | Professional & scientific | 2013 |
| Doficm Limited | Real estate | 2018 |
| Dog PAW Training Ltd | Administrative & support | 2023 |
| Dogbane Design Ltd. | Professional & scientific | 2020 |
| Dogs North West Ltd | Other services | 2022 |
| Dohaai Locum Ltd | Health & social care | 2025 |
| Doherty Estates Ltd | Real estate | 2025 |
| Doherty Venues Ltd | Hospitality | 2024 |
| Doig Venture Holdings Limited | Real estate | 2010 |
| DOL Electrical Limited | Construction | 2019 |
| Dolan Contracting Ltd | Administrative & support | 2025 |
| Dolan Project Services Ltd | Administrative & support | 2024 |
| Dollie Wrinkle Ltd | Wholesale & retail | 2024 |
| Dolphin Homecare Limited | Wholesale & retail | 2007 |
| DOM Top Ltd | Transport & logistics | 2024 |
| Dominic Wing Limited | Professional & scientific | 2016 |
| Dominik Pirek Ltd | Transport & logistics | 2015 |
| Dominique Limited | Professional & scientific | 2021 |
| Dominte Ltd | Transport & logistics | 2019 |
| Domlets Investments Ltd | Real estate | 2024 |
| Domlets Limited | Real estate | 2016 |
| Domneck Limited | Administrative & support | 2016 |
| DON Pino Restaurant Ltd | Hospitality | 2025 |
| DON Wernham Financial Advisers Limited | Financial services | 2006 |
| Don'T Panic Limited | Information & communication | 2019 |
| Donald Mcleod Solutions Ltd | Information & communication | 2026 |
| Donald Robb Engineering Limited | Administrative & support | 2023 |
| Donatello Restaurants Limited | Hospitality | 2018 |
| Done Brothers (Cash Betting) Limited | Arts & recreation | 1976 |
| Done Developments Limited | Extraterritorial | 2005 |
| Done Family Office Limited | Administrative & support | 2019 |
| Done Management Limited | Extraterritorial | 2003 |
| Done Satellite Limited | Information & communication | 2013 |
| Donut LAB Development UK Ltd | Manufacturing | 2024 |
| Doodlemade Ltd | Wholesale & retail | 2015 |
| Doors Estates Limited | Real estate | 2025 |
| Doric Partners LLP | | 2011 |
| Doris Systems Global Limited | Construction | 2007 |
| Dorrocreo Limited | Health & social care | 2015 |