| DAN Smith Planning Limited | Administrative & support | 2016 |
| Danagold Limited | Hospitality | 2021 |
| Dancau Ways Limited | Professional & scientific | 2021 |
| Dance Futures Limited | Arts & recreation | 2010 |
| Dancing Bubbles Limited | Information & communication | 1990 |
| Dancing Ledge FIC Ltd | Financial services | 2023 |
| Dandelion Trading (UK) Ltd | Wholesale & retail | 2011 |
| Danesmead Advisory Limited | Professional & scientific | 2021 |
| Danesmead Consulting Limited | Professional & scientific | 2017 |
| Danfidem Liadility Company Limited | Extraterritorial | 2024 |
| Danibos Ltd | Extraterritorial | 2015 |
| Daniel Crow Ltd | Manufacturing | 2026 |
| Daniel James Lewis Ltd | Information & communication | 2025 |
| Daniel Kemp Limited | Information & communication | 2013 |
| Daniel RAJ Ltd | Wholesale & retail | 2025 |
| Daniel SMW Ltd | Manufacturing | 2024 |
| Daniel Techhnic Ltd | Manufacturing | 2024 |
| Daniel.Banatan Ltd | Manufacturing | 2026 |
| Danielanutu Ltd | Manufacturing | 2025 |
| Danielcon Solutions Limited | Administrative & support | 2015 |
| DANIELROTARIU997 Ltd | Manufacturing | 2026 |
| Danimac Aero Ltd | Manufacturing | 2018 |
| Danish Red White Ltd | Wholesale & retail | 2025 |
| Danniella Tilbury Financial Services Limited | Professional & scientific | 2019 |
| Dante Chem Co., Limited | Wholesale & retail | 2016 |
| Danu Clothing Co., Ltd | Wholesale & retail | 2024 |
| Danu Therapeutics Limited | Professional & scientific | 2025 |
| Danube Fresh Limited | Wholesale & retail | 2017 |
| DAO Airspace Ltd | Manufacturing | 2025 |
| DAO Avionic Ltd | Manufacturing | 2026 |
| DAO Food Express Ltd | Wholesale & retail | 2022 |
| Daphne Cambridge Ltd | Wholesale & retail | 2021 |
| Darany Ltd | Transport & logistics | 2022 |
| Darby's Yard Management Limited | Households | 2005 |
| Dardan (Security) Limited | Administrative & support | 1973 |
| Dardan Security (Systems) Limited | Extraterritorial | 2007 |
| Darfon Ltd | Professional & scientific | 2020 |
| Daria Mira Ltd | Wholesale & retail | 2025 |
| Darina Stoyanova Ltd | Real estate | 2022 |
| Dark Decorators Ltd | Construction | 2020 |
| Dark Star Images Limited | Health & social care | 2020 |
| Darktrace Bidco Limited | Financial services | 2024 |
| Darktrace Finco UK Limited | Financial services | 2024 |
| Darktrace Group Limited | Financial services | 2024 |
| Darktrace Holdings Limited | Information & communication | 2013 |
| Darktrace Limited | Information & communication | 2021 |
| Darktrace Midco I Limited | Financial services | 2024 |
| Darktrace Midco II Limited | Financial services | 2024 |
| Darlow Portfolios Limited | Real estate | 2001 |
| Darmoo Holding Company Limited | Financial services | 2023 |
| Darren Newman Employment Law Limited | Information & communication | 2011 |
| Dart Business Consulting Limited | Professional & scientific | 2012 |
| Dart Metals Private Limited | Wholesale & retail | 2025 |
| Dartford River Crossing Limited | Information & communication | 1986 |
| Dartington Wealth Holdings Limited | Financial services | 2024 |
| Dartington Wealth Management Limited | Financial services | 2015 |
| Dartnell Lynn Ltd | Professional & scientific | 2013 |
| Darts Logistics Ltd | Transport & logistics | 2026 |
| Darway Limited | Extraterritorial | 2022 |
| Darwin Cambridge Limited | Transport & logistics | 2018 |
| Darwin Green Management Company Limited | Households | 2018 |
| Darwinex Global CS Ltd | Financial services | 2025 |
| Darwinvest Limited | Professional & scientific | 2023 |
| DARYO89 Ltd | Information & communication | 2023 |
| Dasd Consulting Limited | Professional & scientific | 2009 |
| Daset Ltd | Information & communication | 2023 |
| Dasherb Ltd | Manufacturing | 2023 |
| Dashiqiao Jiasheng Science and Technology Co., Ltd | Extraterritorial | 2019 |
| Dashnetix Ltd. | Professional & scientific | 2009 |
| Dasp Limited | Transport & logistics | 2023 |
| Data Analytics Consultants Ltd | Information & communication | 2015 |
| Data Centre Lighting Solutions Ltd | Professional & scientific | 2021 |
| Data Conscious Ltd | Public administration | 2020 |
| Data Conversion Systems Limited | Manufacturing | 1986 |
| Data Deciphered Limited | Information & communication | 2025 |
| Data Export Limited | Information & communication | 2011 |
| Data Incite Limited | Professional & scientific | 2025 |
| Data Management Studio Limited | Information & communication | 2025 |
| Data Minded Ltd | Professional & scientific | 2026 |
| Data Racks Limited | Manufacturing | 1996 |
| Data Raven Ltd | Information & communication | 2023 |
| Data Waffle Ltd | Wholesale & retail | 2020 |
| DATA2GO Limited | Information & communication | 2021 |
| Dataai Ltd | Professional & scientific | 2015 |
| Datacomm UK Limited | Professional & scientific | 1999 |
| Dataconnectivity Limited | Information & communication | 2003 |
| Datamation Limited | Information & communication | 1993 |
| Datandem Limited | Information & communication | 2016 |
| Datanomic Shares LP | | 2009 |
| Datanorm Technologies Ltd | Information & communication | 2019 |
| Datastoreonline Ltd | Information & communication | 2008 |
| Datum Flooring Limited | Construction | 2007 |
| Datumine Ltd | Information & communication | 2017 |
| Davda & Co (Accountants) Ltd | Professional & scientific | 2018 |
| Dave Martin Electrical Limited | Construction | 2008 |
| Davenports of Girton Ltd | Hospitality | 2024 |
| David Allsopp Ltd. | Information & communication | 2013 |
| David Arnold Music Limited | Arts & recreation | 1982 |
| David Barber Ltd | Other services | 2025 |
| David Bedwell Limited | Construction | 2019 |