| Drivemark Trading L.P. | | 2018 |
| Driveparts Ltd | Wholesale & retail | 2025 |
| Driver Success NI Ltd | Wholesale & retail | 2023 |
| Driver Theory Belfast Ltd | Education | 2015 |
| Driving Sensei Ltd | Education | 2024 |
| Drmg Engineering Limited | Professional & scientific | 2023 |
| Dromate Consultancy & Outsourcing Limited | Professional & scientific | 2017 |
| Dromcarrick Ltd | Real estate | 2017 |
| Dromhill Properties 2 Limited | Real estate | 2023 |
| Dromhill Properties Ltd | Real estate | 2017 |
| Dromona Quality Foods Limited | Extraterritorial | 2002 |
| Dromore Court Management Co Ltd | Extraterritorial | 2007 |
| Dromore Enterprises Limited | Real estate | 2017 |
| Dromore Supermarkets Ltd | Wholesale & retail | 2026 |
| Drone Aware Limited | Professional & scientific | 2025 |
| Drop Pilates Ltd | Arts & recreation | 2025 |
| Droyt (N.I.) Ltd | Manufacturing | 2020 |
| Drpbsa Ltd | Real estate | 2024 |
| DRT Global Ltd | Manufacturing | 2025 |
| Drtr Associates Ltd | Health & social care | 2026 |
| Druid Software NI Limited | Information & communication | 2025 |
| Drum Energy Ltd | Energy | 2013 |
| Drum Meadows Ltd | Households | 2019 |
| Drumahoe Manor Management Company Limited | Households | 2004 |
| Drumantine Valley Property Management Limited | Extraterritorial | 2022 |
| Drumard Wind Limited | Energy | 2016 |
| Drumart Estates Ltd | Real estate | 2026 |
| Drumatihugh Facilities Management Limited | Real estate | 2014 |
| Drumbo Properties Limited | Real estate | 2016 |
| Drumbreda Bars Limited | Hospitality | 2019 |
| Drumcairn Properties Ltd | Real estate | 2015 |
| Drumcastle Limited | Professional & scientific | 2015 |
| Drumclay Care Village Limited | Health & social care | 2019 |
| Drumconwell Limited | Health & social care | 2022 |
| Drumford House Apartments Management Company Limited | Households | 2024 |
| Drumhappy Wind Limited | Energy | 2016 |
| Drumhoyle Limited | Mining & quarrying | 2013 |
| Drumillen Homes Limited | Real estate | 2006 |
| Drumlee Properties Limited | | 2007 |
| Drumlin Developments Ltd | Construction | 2016 |
| Drumlin Limited | Administrative & support | 2008 |
| Drumlyn Developments Limited | Real estate | 1995 |
| Drummington-Smythe Productions Ltd | Arts & recreation | 2019 |
| Drummond and SON Engineering Ltd | Manufacturing | 2016 |
| Drumolton Holdings Ltd | Financial services | 2021 |
| Drumrusk Ltd | Energy | 2016 |
| DRY Arch Holdings Limited | Financial services | 2017 |
| Dryasmin Ltd | Health & social care | 2024 |
| Dryline-Ai Ltd | Information & communication | 2026 |
| Drypex Ltd | Construction | 2024 |
| DS Bodyfix Ltd | Other services | 2022 |
| DS Security (Belfast) Limited | Administrative & support | 2022 |
| DS21 Limited | Information & communication | 2016 |
| DSC Elgin Properties Limited | Real estate | 2021 |
| DSC Ventures Limited | Professional & scientific | 2019 |
| DSD Distribution Ltd | Extraterritorial | 2024 |
| DSJ Interiors N.I Ltd | Manufacturing | 2022 |
| DSL Network Ltd | Information & communication | 2025 |
| DSM Communications N.I Ltd | Manufacturing | 2021 |
| Dsmdproducts Ltd | Wholesale & retail | 2025 |
| Dsmiles Medical Services Ltd | Health & social care | 2024 |
| Dssrt Fctry Ltd | Wholesale & retail | 2017 |
| Dsst Global Ltd | Wholesale & retail | 2024 |
| Dswbzf Ltd | Wholesale & retail | 2024 |
| DT Auto Tint Ltd | Wholesale & retail | 2021 |
| DT Construction Services Limited | Construction | 2025 |
| DT Stomatological Ltd | Health & social care | 2025 |
| Dteduggan Limited | Professional & scientific | 2021 |
| DTJ 7 Ltd | Hospitality | 2016 |
| DTK Engineering Limited | Construction | 2016 |
| DTM Precision Ltd | Professional & scientific | 2025 |
| DTM Property Works Ltd | Real estate | 2026 |
| Dtmk Capital Ltd | Financial services | 2026 |
| DTS Site Services Ltd | Construction | 2019 |
| DTX Lihua Ltd | Professional & scientific | 2023 |
| DU Dance (NI) | Arts & recreation | 2007 |
| Dualistic Ltd | Arts & recreation | 2021 |
| Duane Connor Ltd | Wholesale & retail | 2025 |
| Duanyyend Ltd | Wholesale & retail | 2025 |
| Dublin Games and Toys Ltd | Wholesale & retail | 2024 |
| Dublin Murders Productions Limited | Extraterritorial | 2018 |
| Dublin Technology Toys Limited | Wholesale & retail | 2025 |
| Ducales Asset NO. 1 Limited | Hospitality | 2013 |
| Ducales Asset NO. 2 Limited | Real estate | 2013 |
| Ducales Asset NO. 3 Limited | Real estate | 2013 |
| Ducales Asset NO. 4 Limited | Real estate | 2013 |
| Ducales Capital Limited | Professional & scientific | 2013 |
| Ducales Trading NO. 1 Limited | Financial services | 2013 |
| Ducales Trading NO. 2 Limited | Financial services | 2013 |
| Ducales Trading NO. 3 Limited | Real estate | 2013 |
| Ducales Trading NO. 4 Limited | Real estate | 2013 |
| Ducales Trading NO. 5 Limited | Real estate | 2013 |
| Ducales Trading NO. 6 Limited | Real estate | 2013 |
| Ducales Trading NO.10 Limited | Extraterritorial | 2013 |
| Ducales Trading NO.11 Limited | Extraterritorial | 2013 |
| Ducales Trading NO.12 Limited | Extraterritorial | 2013 |
| Ducales Trading NO.13 Limited | Extraterritorial | 2015 |
| Ducales Trading NO.14 Limited | Extraterritorial | 2015 |
| Ducales Trading NO.15 Limited | Extraterritorial | 2015 |
| Ducales Trading NO.16 Limited | Extraterritorial | 2015 |