| David Spear Holdings Limited | Financial services | 2024 |
| David Watkins Consultancy Limited | Real estate | 2020 |
| Davids Wharf Site Management Company Limited | Real estate | 2011 |
| Davidson Portfolio Limited | Real estate | 2026 |
| Davidvela Ltd | Transport & logistics | 2025 |
| David’S Prestige Autos Ltd | Wholesale & retail | 2024 |
| David’S Services Ltd | Administrative & support | 2020 |
| Davies & Gale Properties Limited | Real estate | 2025 |
| Davies Building Improvements Limited | Construction | 2021 |
| Davies Colour Limited | Professional & scientific | 1981 |
| Davies Commercial Services Limited | Administrative & support | 2011 |
| Davies Develop Ltd | Information & communication | 2025 |
| Davies Developers Ltd | Construction | 2020 |
| Davies Digital Assets Ltd | Financial services | 2024 |
| Davies International (UK) Ltd | Wholesale & retail | 2014 |
| Davies Motor Company Limited | Wholesale & retail | 2003 |
| Davies Resin Limited | Construction | 2025 |
| Davies Surveys Limited | Professional & scientific | 2010 |
| Davies Sutton Architecture Limited | Professional & scientific | 1999 |
| Davies Vibe Ltd | Wholesale & retail | 2025 |
| Davies Warburton Limited | Wholesale & retail | 2019 |
| Davies Wright Capital Limited | Real estate | 2026 |
| Daviesestaterenovations Ltd | Real estate | 2025 |
| Davinchi Global Ltd | Wholesale & retail | 2014 |
| Daviola Logistics Ltd | Transport & logistics | 2025 |
| Daviot Street (Cardiff) Management Company Limited | Administrative & support | 2008 |
| Davis & Dwellings Limited | Real estate | 2025 |
| Davis & Mccardle (Property Development) Ltd | Construction | 2018 |
| Davis Acquisitions Ltd | Professional & scientific | 2023 |
| Davis Co. Holdings Ltd. | Information & communication | 2013 |
| Davis Coatings Ltd | Construction | 2019 |
| Davisave Ltd | Wholesale & retail | 2026 |
| Daviyk Services Limited | Financial services | 2017 |
| Davlin Consulting Ltd | Construction | 2014 |
| Davnic Close Management Limited | Households | 1996 |
| Davy Studio Ltd | Wholesale & retail | 2021 |
| Dawa Solutions Ltd | Education | 2010 |
| Dawar Al-Omda CIC | Education | 2024 |
| Dawgiert Ltd | Administrative & support | 2014 |
| Dawn Bates International Ltd | Information & communication | 2023 |
| Dawnbreak Development Ltd | Real estate | 2024 |
| Dawnforge Limited | Extraterritorial | 2016 |
| Dawnpalm Limited | Manufacturing | 2018 |
| Dawo Pharma Ltd | Health & social care | 2022 |
| Dawson Christie Ltd | Professional & scientific | 2020 |
| Dawson LRB Limited | Construction | 2024 |
| Dawson Stone Masonry Limited | Construction | 1997 |
| Dawsons Tyldesley Ltd | Wholesale & retail | 2020 |
| Daxie Creative Ltd | Arts & recreation | 2025 |
| Day & Night Healthcare Agency Ltd | Health & social care | 2018 |
| Day & Night Property Investors Ltd | Real estate | 2022 |
| Day 2 Day Elite Ltd | Wholesale & retail | 2025 |
| Day Group Holdings Limited | Manufacturing | 2025 |
| DAY2DAY Developments Ltd | Construction | 2018 |
| DAY4NIGHT Ltd | Extraterritorial | 2022 |
| Daya RAM Katara Investments Ltd | Real estate | 2025 |
| Daybreak Tickets Ltd | Arts & recreation | 2017 |
| Daye City Co., Ltd | Wholesale & retail | 2025 |
| Daynex Software Limited | Information & communication | 2025 |
| Daynt UK Ltd | Information & communication | 2023 |
| Daysman Ltd | Other services | 2025 |
| Daytiq Ltd | Information & communication | 2026 |
| Daywork Limited | Wholesale & retail | 1988 |
| Dayyi Ltd | Wholesale & retail | 2022 |
| DAZ Consultancy Ltd | Professional & scientific | 2026 |
| DAZ Consulting Ltd | Information & communication | 2018 |
| Dazzle and Shine South Wales Ltd | Administrative & support | 2019 |
| Dazzle Cleaning Services Cardiff Limited | Administrative & support | 2013 |
| Dazzling Cafe Manchester Ltd | Hospitality | 2016 |
| DB Autocare Services Ltd | Wholesale & retail | 2019 |
| DB Coffees UK Ltd | Hospitality | 2018 |
| DB Financial Advisors Limited | Professional & scientific | 2020 |
| DB Fitness and Nutrition Ltd | Hospitality | 2019 |
| DB Gold Limited | Wholesale & retail | 2013 |
| DB Online Retail Ltd | Wholesale & retail | 2025 |
| DB Publications Ltd | Information & communication | 2015 |
| DB Social Care Services Limited | Health & social care | 2013 |
| Dbdean Ltd | Manufacturing | 2019 |
| Dbeere Properties Limited | Real estate | 2016 |
| Dbenj Consultancy Ltd | Information & communication | 2018 |
| DBF Infrastructure Ltd | Construction | 2021 |
| DBG Projects Ltd | Professional & scientific | 2025 |
| DBL Building Contractors Ltd | Construction | 2026 |
| DBL Management Ltd | Transport & logistics | 2009 |
| DBM Construction Services Ltd | Construction | 2024 |
| Dbomni Ltd | Wholesale & retail | 2024 |
| Dboon Limited | Professional & scientific | 2017 |
| DBP (Cardiff) Limited | Real estate | 2003 |
| DBP Consulting Services Limited | Administrative & support | 2014 |
| DBP Inspection Services Limited | Professional & scientific | 2017 |
| Dbrb Services Ltd | Administrative & support | 2019 |
| DBS Facades Ltd | Construction | 2024 |
| DBS Property Solutions Limited | Construction | 2018 |
| DC Academy Ltd | Education | 2016 |
| DC Flooring Services Limited | Construction | 2025 |
| DC Glazing Limited | Construction | 2015 |
| DC Global Finance Corporateholding Ltd | Financial services | 2024 |
| DC Imports UK Ltd | Wholesale & retail | 2017 |
| DC Kettles & Assets Limited | Wholesale & retail | 2019 |
| DC Property SE Maintenance Limited | Administrative & support | 2019 |