| Darmanin Properties Limited | Real estate | 2011 |
| Darmanin Property Services Limited | Real estate | 2011 |
| Darogan Limited | Information & communication | 2022 |
| Darra Construction Ltd | Construction | 2025 |
| Darran Furniture Limited | | 1975 |
| Darrant Chemicals Ltd | Wholesale & retail | 2018 |
| Darren Ellaway Roofing Limited | Construction | 2022 |
| Darren Evans Flooring Limited | Wholesale & retail | 2014 |
| Darta Holding Ltd | Financial services | 2019 |
| Dartbrooke Coffee Ltd. | Hospitality | 2017 |
| Darwin Energy Ltd | Manufacturing | 2025 |
| Darwin Gray LLP | | 2008 |
| Darwins Holdings Limited | Manufacturing | 1957 |
| DAS Construction Service Limited | Construction | 2012 |
| DAS Global Limited | Professional & scientific | 2025 |
| DAS Services U.K. Ltd | Administrative & support | 2017 |
| Dash of Blue Limited | Administrative & support | 2024 |
| Dash Pro Ltd | Information & communication | 2025 |
| Dashdamirov Ltd | Wholesale & retail | 2023 |
| Dashwood & Twist Limited | Agriculture & fishing | 2009 |
| DAT Logistic Ltd | Transport & logistics | 2019 |
| Data Aggregates Ltd | Information & communication | 2020 |
| Data Driven Decisions Ltd | Information & communication | 2019 |
| Data Driven Media Ltd | Professional & scientific | 2021 |
| Data Holdings Ltd | Financial services | 2024 |
| Data Insights Limited | Information & communication | 2020 |
| Data Investigations Ltd | Information & communication | 2009 |
| Data Privacy & Security Services Limited | Information & communication | 2021 |
| Data Quill Limited | Information & communication | 2025 |
| Data Storage Distribution Limited | Professional & scientific | 2017 |
| Data Track Gate Ltd | Information & communication | 2025 |
| Data Voyage Ltd | Information & communication | 2025 |
| Datacrunchr Ltd | Information & communication | 2019 |
| Datadrop UK Ltd | Wholesale & retail | 2019 |
| Dataflow Systems Ltd | Professional & scientific | 2014 |
| Datafy Limited | Information & communication | 2020 |
| Datahost Ltd | Information & communication | 2020 |
| Datalearn Consults Ltd | Information & communication | 2025 |
| Datalineage Consulting Limited | Information & communication | 2022 |
| Datalyse Group Ltd | Administrative & support | 2018 |
| Datamatics Payroll Services Ltd | Administrative & support | 2017 |
| Datamatics Payroll Solutions Ltd | Information & communication | 2015 |
| Datamonet Ltd | Information & communication | 2021 |
| Datamorph Technologies Limited | Information & communication | 2025 |
| Datapilotdb Ltd | Information & communication | 2025 |
| Datatech Electrical Services Ltd | Administrative & support | 2019 |
| Datatrack Labs Ltd | Information & communication | 2006 |
| Dataverse AIM Limited | Information & communication | 2017 |
| Datazent Limited | Information & communication | 2025 |
| Daters Films Ltd | Manufacturing | 2020 |
| Datkins Solutions Limited | Professional & scientific | 2013 |
| Datli Limited | Wholesale & retail | 2025 |
| Dato Tech Ltd | Wholesale & retail | 2025 |
| Datone Communications Ltd | Information & communication | 2013 |
| Datrys Legal Consulting Limited | Professional & scientific | 2024 |
| Datum Construction NE Limited | Construction | 2019 |
| Datum Engineering (General Business) Limited | Manufacturing | 2005 |
| Datum Metrology Ltd | Professional & scientific | 2010 |
| Daurin Limited | Extraterritorial | 2014 |
| Dauson Environmental Group Limited | Professional & scientific | 2009 |
| Dauson Holdings UK Limited | Professional & scientific | 2009 |
| Dauvine Ltd | Wholesale & retail | 2024 |
| Dauwd Corp Limited | Hospitality | 2025 |
| Davamor Trading Limited | Wholesale & retail | 2018 |
| Dave Barry Wealth Management Limited | Financial services | 2017 |
| Dave Driscoll Limited | Other services | 2000 |
| Dave Judd Ltd | Information & communication | 2003 |
| Dave Prance Tyre & Autocentres Limited | Wholesale & retail | 2006 |
| Dave Roberts Cameraman Limited | Information & communication | 2013 |
| Davedhari Limited | Wholesale & retail | 2026 |
| Daves Local Plumber Ltd | Construction | 2025 |
| Daves Tellycoms Ltd | Construction | 2021 |
| Davey Law Limited | Extraterritorial | 2011 |
| David & Co Property Ltd | Real estate | 2022 |
| David and Sandra Building Limited | Construction | 2022 |
| David Bacauanu Transport Limited | Transport & logistics | 2017 |
| David Blakeley Limited | Other services | 2010 |
| David Bolwell Physiotherapy Services Limited | Health & social care | 2011 |
| David Brookes Limited | Health & social care | 2016 |
| David Chapman Associates Limited | Professional & scientific | 2000 |
| David Clifford Ltd | Construction | 2014 |
| David Crosbie Construction Ltd | Construction | 2022 |
| David Cruse Projects Ltd | Construction | 2025 |
| David Cruse Properties Limited | Real estate | 2017 |
| David Evans Solutions Limited | Construction | 2015 |
| David Graham Roblin Limited | Health & social care | 2018 |
| David L Small Limited | | 2007 |
| David Leslie Wynn Limited | Wholesale & retail | 2024 |
| David Matthews Property Services Limited | Real estate | 2006 |
| David Pemberton Orthopaedics Ltd | Health & social care | 2022 |
| David Pitt Limited | Health & social care | 2006 |
| David Potts Technical Services Ltd | Administrative & support | 2015 |
| David Printers Limited | Arts & recreation | 1941 |
| David Reynolds Consulting Services Limited | Education | 2016 |
| David Ricketts Property Services Limited | Real estate | 2014 |
| David Roberts Roofing Limited | Construction | 2018 |
| David Sayce Holdings Limited | Professional & scientific | 2021 |
| David Services Limited Limited | Information & communication | 2020 |
| David Smart & Associates Limited | Professional & scientific | 1990 |
| David Spear EOT Limited | Administrative & support | 2025 |