| Doxbond (NI) Ltd | Extraterritorial | 2013 |
| Doyle Jason Thomas Ltd | Wholesale & retail | 2025 |
| Doyle Security Services Ltd | Administrative & support | 2023 |
| Doyle Shipping Group (Belfast) Unlimited | Other services | 1921 |
| Doyle.Roden Limited | Construction | 2003 |
| DP 2018 Limited | Hospitality | 2018 |
| DP Furniture Designs Limited | Wholesale & retail | 2015 |
| DP Ireland Ltd | Information & communication | 2011 |
| DP Service & Distribution Ltd | Wholesale & retail | 2019 |
| DP Tech UK Ltd | Wholesale & retail | 2026 |
| DP Textile Ltd | Wholesale & retail | 2020 |
| Dpam Properties Limited | Real estate | 2011 |
| DPB NI Engineering Limited | Wholesale & retail | 2014 |
| Dpjf Holdings Limited | Information & communication | 2016 |
| Dpjk Ltd | Hospitality | 2024 |
| Dpks Properties Ltd | Real estate | 2019 |
| DPM Safety Ltd | Information & communication | 2019 |
| Dpmni Ltd | Construction | 2023 |
| DPO Cable Services Ltd | Construction | 2024 |
| DPS Management (NI) Limited | Real estate | 2004 |
| Dpsb Limited | Construction | 2021 |
| Dpto Limited | Information & communication | 2013 |
| Dpzone Ltd | Wholesale & retail | 2023 |
| Dqcgma Ltd | Professional & scientific | 2024 |
| DQT Europe Ltd | Wholesale & retail | 2024 |
| DR Aidan Murray Medical Aesthetics Limited | Health & social care | 2025 |
| DR AM Mcshane Ltd | Health & social care | 2023 |
| DR Amjed NI Limited | Health & social care | 2023 |
| DR AMY Clinic Limited | Other services | 2024 |
| DR B Friel Ltd | Health & social care | 2018 |
| DR Chogle Ltd | Health & social care | 2019 |
| DR Clarke Ltd | Health & social care | 2019 |
| DR Contract Services Ltd | Construction | 2019 |
| DR Cormac Lynch Medical Aesthetics Ltd | Health & social care | 2023 |
| DR David Gallagher | Health & social care | 2012 |
| DR Hennessy Aesthetics Limited | Other services | 2025 |
| DR Hennessy Radiology Services Ltd | Health & social care | 2025 |
| DR HR Glover Ltd | Health & social care | 2025 |
| DR J Doherty Ltd | Health & social care | 2016 |
| DR John Sharkey Limited | Health & social care | 2010 |
| DR K Sweeney Psychological Services Ltd | Health & social care | 2019 |
| DR Light Ltd | Wholesale & retail | 2023 |
| DR Mark Hampton | Health & social care | 2011 |
| DR Nick Cromie Cardiac Electrophysiologist Ltd | Health & social care | 2019 |
| DR Patrick Campbell Ltd | Health & social care | 2012 |
| DR RAU Management Services Ltd | Professional & scientific | 2021 |
| DR Redpath Child Psychiatry Ltd | Health & social care | 2025 |
| DR Richard Morrison Ltd | Health & social care | 2022 |
| DR Rory Aesthetics Ltd | Health & social care | 2025 |
| DR S Cura Medical Limited | Health & social care | 2025 |
| DR Selcen's Medical Academy Limited | Health & social care | 2024 |
| DR Sinead Hughes Ltd | Health & social care | 2024 |
| DR TJ Properties Ltd | Real estate | 2015 |
| DR Wind Limited | Professional & scientific | 2020 |
| DR. Brendan Mcadam | Health & social care | 2012 |
| DR. John Kinsella | Health & social care | 2010 |
| DR. Mark Spence Limited | Health & social care | 2012 |
| DR. P Donnelly Ltd | Health & social care | 2012 |
| DR. Patrick O'Connor | Health & social care | 2010 |
| DR. Storm Limited | Wholesale & retail | 2021 |
| Drafti Ltd | Administrative & support | 2023 |
| Dragon City Belfast Ltd | Hospitality | 2023 |
| Dragon Facility Solution Limited | Administrative & support | 2026 |
| Dragy International Limited | Wholesale & retail | 2024 |
| Drain Wizard Belfast Limited | Water & waste | 2024 |
| Drakeman Films Limited | Information & communication | 2020 |
| Drannandow Ltd | Agriculture & fishing | 2023 |
| Drcl Holdings Limited | Financial services | 2023 |
| Dream 9398 Ltd | Other services | 2025 |
| Dream Apartment Newcastle Limited | Hospitality | 2016 |
| Dream Apartments Belfast Limited | Hospitality | 2016 |
| Dream Apartments Cardiff Limited | Hospitality | 2017 |
| Dream Apartments Kensington House Ltd | Hospitality | 2019 |
| Dream Apartments Liverpool Limited | Hospitality | 2016 |
| Dream Apartments Middlesbrough Ltd | Hospitality | 2019 |
| Dream Mentoring Ltd | Professional & scientific | 2021 |
| Dream Social Media Limited | Professional & scientific | 2024 |
| Dream Worldwide Ltd | Administrative & support | 2020 |
| Dreamscheme Northern Ireland | Health & social care | 2013 |
| Dreenan Enterprises Limited | Hospitality | 2016 |
| Dreenan Limited | Administrative & support | 1996 |
| Dreenan Management Limited | Hospitality | 2016 |
| Dreenlough Ltd | Health & social care | 2013 |
| Dreg-Bill E Commance and Logistics Ltd | Wholesale & retail | 2026 |
| Dreg-Bill Ltd | Health & social care | 2025 |
| Drennan Hill Limited | Agriculture & fishing | 2017 |
| Drew (Belfast) Ltd | Hospitality | 2020 |
| Drew Wylie Building Services Ltd | Construction | 2023 |
| Drift Space Limited | Manufacturing | 2024 |
| Driftrack Limited | Transport & logistics | 2025 |
| Driftwood Trade LP | | 2025 |
| Drim Trading Limited | Wholesale & retail | 2023 |
| Drin Wind Limited | Energy | 2016 |
| Drinks N.I. Ltd | Wholesale & retail | 2024 |
| Drinksology Holdco Limited | Financial services | 2025 |
| Drinksology Kirker Greer Ltd | Financial services | 2025 |
| Drinksology Limited | Wholesale & retail | 2017 |
| Drinnahilly Gardens Management Limited | Households | 2003 |
| Drive-Spray Ltd | Wholesale & retail | 2015 |
| Drivebuy Motors Armagh Ltd | Wholesale & retail | 2018 |