| Digitaldr Marketing Ltd | Professional & scientific | 2024 |
| DIGITALECOM1 Limited | Other services | 2025 |
| Digitalimpact Information Ltd | Information & communication | 2025 |
| Digitalios AM Ltd | Professional & scientific | 2023 |
| Digitalkoll Ltd | Other services | 2024 |
| Digitallesuk Ltd | Information & communication | 2017 |
| DIGITALS4RENT Ltd | Professional & scientific | 2021 |
| DIGITALSHOP24 Ltd | Wholesale & retail | 2025 |
| Digitara Nest Ltd | Wholesale & retail | 2025 |
| Digitax Consulting Ltd | Wholesale & retail | 2021 |
| Digitel Crox Ltd | Wholesale & retail | 2025 |
| Digiterms Ltd | Information & communication | 2025 |
| Digithaw & Partners Ltd | Professional & scientific | 2020 |
| Digiting Limited | Professional & scientific | 2023 |
| Digitize Online Limited | Other services | 2020 |
| Digitnext Limited | Wholesale & retail | 2025 |
| Digitravel Network Limited | Information & communication | 2025 |
| Digiville Consulting Ltd | Information & communication | 2017 |
| Digiville Hospitality & Entertainment Ltd | Hospitality | 2019 |
| Digivista Limited | Professional & scientific | 2025 |
| Digiway Ltd | Wholesale & retail | 2021 |
| Digiweb Ltd | Information & communication | 2025 |
| Digiwise Group Ltd | Wholesale & retail | 2021 |
| Digizani Ltd | Information & communication | 2014 |
| Dignity Cleaning Limited | Administrative & support | 2024 |
| Digplr Ltd | Information & communication | 2024 |
| Digread Ltd | Professional & scientific | 2025 |
| Dihadem Ukeig | | 2019 |
| DIJ Electrical Limited | Construction | 2019 |
| Dijla Limited | Hospitality | 2001 |
| Dikaa Ltd | Wholesale & retail | 2025 |
| Diksiyon Ltd | Education | 2024 |
| Dikur Ltd | Wholesale & retail | 2021 |
| DIL Compliance Ltd | Financial services | 2023 |
| DIL Indian Cuisine Limited | Hospitality | 2016 |
| Dilas Group Ltd | Wholesale & retail | 2019 |
| Dilbir Investments Limited | Real estate | 2025 |
| Dilek Taylan Ltd | Manufacturing | 2020 |
| DILEMA387 Ltd | Wholesale & retail | 2025 |
| Dilemma Sounds Ltd | Arts & recreation | 2025 |
| Diliara Ltd | Wholesale & retail | 2025 |
| Dilinie Thampiyappa Limited | Professional & scientific | 2008 |
| Dill Transport Ltd | Transport & logistics | 2012 |
| Dillon Smith Ltd | Real estate | 2009 |
| Dilton Automotive Solutions Limited | Wholesale & retail | 2002 |
| Dimandus Alliance PC | | 2020 |
| Dimane Global PC | | 2020 |
| Dimension 8 Limited | Arts & recreation | 1990 |
| Dimension Four Technology Limited | Wholesale & retail | 2017 |
| Dimensional Trade Limited | Wholesale & retail | 2023 |
| Dimensions Cymru Limited | Health & social care | 2020 |
| Dimk Engineering Limited | Manufacturing | 2016 |
| Dimlands Property Management Limited | Households | 2017 |
| Dimo Industry Ltd | Extraterritorial | 2018 |
| Dimri Tech Solutions Ltd | Information & communication | 2025 |
| Dinam Estate Rural Management Limited | Real estate | 2025 |
| Dinamic Interiors Limited | Construction | 2019 |
| Dinamo Productions Limited | Information & communication | 2004 |
| Dinapoli Motor Services Limited | Wholesale & retail | 2021 |
| Dinas Planning Ltd | Professional & scientific | 2022 |
| Dinas Windows Limited | Manufacturing | 1988 |
| Dincel Ltd | Wholesale & retail | 2025 |
| Dine Happy Ltd | Hospitality | 2021 |
| Dine in Table Limited | Information & communication | 2019 |
| Dine With Maharaja Limited | Hospitality | 2019 |
| Dinecasas Limited | Construction | 2018 |
| Dinecenter Ltd | Hospitality | 2025 |
| Dinecord Ltd | Wholesale & retail | 2025 |
| Dinee Ltd | Real estate | 2019 |
| Dinem Estate Ltd | Real estate | 2023 |
| Ding CIC | Administrative & support | 2024 |
| Dingfeng International Express Ltd | Wholesale & retail | 2015 |
| Dingguagua Ltd | Hospitality | 2026 |
| Dingit Telecommunications Limited | Information & communication | 2012 |
| Dini Services Ltd | Wholesale & retail | 2018 |
| Dining and Catering Company Ltd | Hospitality | 2016 |
| Dining Lees Limited | Hospitality | 2024 |
| Dining Table Industries Ltd | Wholesale & retail | 2025 |
| Diobic Ltd | Wholesale & retail | 2018 |
| Diodydd Diolch Drinks CYF | Wholesale & retail | 2024 |
| Diogel Ltd | Professional & scientific | 2015 |
| Diolchus Ltd | Hospitality | 2018 |
| Diolys Ltd | Wholesale & retail | 2024 |
| Dionamite Ltd | Information & communication | 2024 |
| Dior Services Ltd | Wholesale & retail | 2026 |
| DIP Properties UK Ltd | Real estate | 2021 |
| Dipacci Coffee Company UK Ltd | Wholesale & retail | 2025 |
| Dipali Indian Cuisine Ltd | Hospitality | 2025 |
| Dipec Plastics Holdings Limited | Manufacturing | 1990 |
| Diploma Developments Limited | Construction | 2013 |
| Diplomat Bidco Limited | Financial services | 2025 |
| Diplomat Midco 1 Limited | Financial services | 2025 |
| Diplomat Midco 2 Limited | Financial services | 2025 |
| Diplomat Topco Limited | Financial services | 2025 |
| Dipmog Limited | Transport & logistics | 2024 |
| Direct Accounting Services (Cardiff) Limited | Professional & scientific | 2002 |
| Direct Accounting Solutions Limited | Financial services | 2015 |
| Direct Commercials Cumbria Ltd | Wholesale & retail | 2025 |
| Direct Connect (ISP) Ltd | Information & communication | 2025 |
| Direct Eyecare (UK) Limited | Health & social care | 2012 |