| Dance & Gymnastics Academy Aintree LLP | | 2026 |
| Dance & Gymnastics Franchising Ltd | Administrative & support | 2026 |
| Dance Court Management Company Limited | Households | 2005 |
| Danconsult Ltd | Wholesale & retail | 2019 |
| Danda Housing Limited | Real estate | 2026 |
| Dandac Projects Limited | Health & social care | 2024 |
| Dandelion Financial Limited | Financial services | 2013 |
| Danevy Retail Limited | Manufacturing | 2025 |
| Dangerfields Hire Ltd | Transport & logistics | 2018 |
| Danicom IT Solutions Limited | Information & communication | 2016 |
| Daniel Coles Accountancy Services Limited | Professional & scientific | 2022 |
| Daniel Hoffmann & Partner Ltd | Administrative & support | 2009 |
| Daniel O'Connell Ltd | Professional & scientific | 2026 |
| Daniel Sprianu Limited | Transport & logistics | 2010 |
| Danlin Trading Ltd | Wholesale & retail | 2019 |
| Danmar Transport Ltd | Transport & logistics | 2015 |
| Danny Hale Property Ltd | Real estate | 2024 |
| Danodu Logistics Ltd | Transport & logistics | 2025 |
| Dansam Limited | Professional & scientific | 1999 |
| Dant Estates Limited | Real estate | 2003 |
| Danten Ltd | Hospitality | 2024 |
| Danube Transport Ltd | Transport & logistics | 2019 |
| Danut Delivery Ltd | Transport & logistics | 2023 |
| DAP Consultancy Limited | Professional & scientific | 2021 |
| DAR City Care Group Limited | Administrative & support | 2026 |
| Darbera Ltd | Professional & scientific | 2026 |
| Darby Gate Ltd | Health & social care | 2016 |
| Darby Investments Ltd | Health & social care | 2021 |
| Darby Wealth Limited | Health & social care | 2019 |
| DARE2BE Roots & Growth Ltd | Education | 2025 |
| DARE2CARE Services Ltd | Administrative & support | 2016 |
| Darkkins Ltd | Wholesale & retail | 2023 |
| Darkotem Properties Limited | Households | 2022 |
| Darkowaah Ltd | Health & social care | 2023 |
| Darkroom Espresso (Swindon) Limited | Hospitality | 2019 |
| Darren Inglis Bricklaying Services Limited | Construction | 2002 |
| Darren Sullivan Limited | Construction | 2012 |
| Darren Taylor Holdings Limited | Professional & scientific | 2013 |
| Dars Essentials Ltd | Wholesale & retail | 2025 |
| Dart Resources Ltd | Administrative & support | 2023 |
| DAS & Co Services Limited | Other services | 2024 |
| Dash Five Building Services Ltd | Construction | 2019 |
| Dash GRP Limited | Information & communication | 2024 |
| Dasz Transport Limited | Transport & logistics | 2024 |
| Data Artificial Intelligence Limited | Information & communication | 2025 |
| Data Centre Response Limited | Information & communication | 2012 |
| Data Interconnect Limited | Information & communication | 2000 |
| Data-Defence.Co.Uk Ltd | Professional & scientific | 2009 |
| Data-Tight Limited | Professional & scientific | 2016 |
| Dataavanu Limited | Professional & scientific | 2016 |
| Datacrest Ltd | Information & communication | 2023 |
| Datalibrium Limited | Information & communication | 2006 |
| Datamarkone Limited | Information & communication | 2015 |
| Datamind Analytics Limited | Other services | 2025 |
| Datanet Group (UK) Ltd | Information & communication | 2016 |
| Dataoptix UK Limited | Information & communication | 2025 |
| Datevale Limited | Professional & scientific | 2005 |
| Datient Ltd | Information & communication | 2025 |
| Daultrey (Holdings) Ltd | Extraterritorial | 2018 |
| Daultrey Electrical Ltd. | Construction | 2006 |
| Daultrey Properties Ltd | Real estate | 2018 |
| Dauntsey House Management Company Limited | Households | 2015 |
| Dauphine Aesthetics LAB Ltd | Health & social care | 2025 |
| Dave Butler Print Limited | Manufacturing | 2012 |
| Dave Hughes Courier Limited | Transport & logistics | 2023 |
| Dave Taylor Leisure Ltd | Wholesale & retail | 2013 |
| Davey and Billson Limited | Real estate | 1972 |
| Davic Financial Services Limited | Professional & scientific | 2005 |
| David Allworth Bennett Ltd | Professional & scientific | 2025 |
| David Brett Solutions Limited | Professional & scientific | 2010 |
| David Bukenya & a Paul Partnership Ltd | Wholesale & retail | 2022 |
| David Kilminster Ltd | Other services | 2011 |
| David Merritt & Associates Limited | Professional & scientific | 2007 |
| David Michael Russell Ltd | Professional & scientific | 2026 |
| David Morrison Photography Limited | Professional & scientific | 2003 |
| David Neale Associates Limited | Professional & scientific | 2015 |
| David Newman Contractors Limited | Agriculture & fishing | 2012 |
| David Sainsbury Ltd | Wholesale & retail | 2018 |
| David Sanson Limited | Professional & scientific | 2014 |
| David Vale (Engineering) Limited | Professional & scientific | 2002 |
| David&Matei Trans Ltd | Transport & logistics | 2019 |
| Davidal Ltd | Agriculture & fishing | 2022 |
| Davies Property Evolutions Ltd | Real estate | 2023 |
| Davies Property Holdings Limited | Construction | 2019 |
| Davies Property Lettings Limited | Real estate | 2021 |
| Davmar Logistics Ltd | Transport & logistics | 2019 |
| Davmay 10 Limited | Real estate | 2013 |
| Davond Limited | Education | 2026 |
| Davria Ltd | Administrative & support | 2016 |
| Davu Ltd | Health & social care | 2026 |
| DAW Holdings Ltd | Other services | 2020 |
| Dawid Czernicki Ltd | Transport & logistics | 2012 |
| Dawlance UK Limited | Wholesale & retail | 2025 |
| Dawn Care Services Ltd | Health & social care | 2023 |
| Dawson & Marsh Developments Limited | Construction | 2024 |
| Dawson & Marsh Holdings Ltd | Construction | 2013 |
| Dawson & Marsh Limited | Construction | 2007 |
| Dawson Guarantee Company Limited | Extraterritorial | 2009 |
| Dawson Holdings Limited | Financial services | 1891 |
| Dawson Limited | Administrative & support | 1997 |