| Debrao Ventures Limited | Real estate | 2025 |
| Debrouillard Limited | Information & communication | 1996 |
| Debs Cottages Ltd | Hospitality | 2026 |
| Debt Guard Limited | Extraterritorial | 2003 |
| Debt Recovery Services Limited | Extraterritorial | 2002 |
| DEC Art Lawns Ltd | Construction | 2018 |
| Decade of Wealth Limited | Information & communication | 2025 |
| Decal Water Management Services Limited | Professional & scientific | 2012 |
| Deceptivecities Ltd | Wholesale & retail | 2025 |
| Decime Ltd | Information & communication | 2017 |
| Decision Precision Ltd | Professional & scientific | 2025 |
| Decontamination Cleanup Ltd | Administrative & support | 2018 |
| Decor Barber Limited | Other services | 2022 |
| Decorating & Cleaning Services Ltd | Administrative & support | 2017 |
| Decorideal Limited | Real estate | 1993 |
| Decrhi Carpets Limited | Wholesale & retail | 2024 |
| Decrhi Investments Limited | Financial services | 2022 |
| Decs Holdings Limited | Households | 2018 |
| Decs Properties Limited | Households | 2013 |
| DED Associates Ltd | Professional & scientific | 1998 |
| Dedicated Sameday Ltd | Transport & logistics | 2019 |
| Dedicated Systems Limited | Construction | 2010 |
| Dedictd Ltd | Wholesale & retail | 2026 |
| DEE DAH Publishing Limited | Information & communication | 2019 |
| DEE X Ltd | Professional & scientific | 2026 |
| Deeble-Rogers Ltd | Professional & scientific | 2019 |
| Deed Mountain Ltd | Wholesale & retail | 2025 |
| Deedee App Ltd | Wholesale & retail | 2025 |
| Deem Motors Ltd | Wholesale & retail | 2022 |
| Deep Fresh Limited | Wholesale & retail | 2017 |
| Deep Green Limited | Arts & recreation | 2021 |
| Deep Spectrum Limited | Administrative & support | 2014 |
| Deep Whale Limited | Wholesale & retail | 2025 |
| Deepcar Autobodies Limited | Wholesale & retail | 2009 |
| Deepcar Construction Limited | Construction | 2023 |
| Deepcar Home Improvements Limited | Construction | 2020 |
| Deepcar Limited | Wholesale & retail | 1991 |
| Deepcar Motor Company (Sheffield) Ltd | Wholesale & retail | 2020 |
| Deepcar Motor Company Ltd | Wholesale & retail | 2019 |
| Deepcar Properties Limited | Real estate | 2024 |
| Deepcar Tyre & Auto Centre Ltd | Wholesale & retail | 2021 |
| Deepdale Projects Limited | Construction | 2025 |
| Deepdene Schools Limited | Education | 1999 |
| Deer Park Way 53 Limited | Extraterritorial | 2013 |
| Deery Litigation Service Limited | Professional & scientific | 2017 |
| Defacto Solutions Limited | Information & communication | 1991 |
| Defence Group Ltd | Other services | 2020 |
| Defence Shopfronts Limited | Manufacturing | 2025 |
| Defer Ltd | Professional & scientific | 2023 |
| Deffinity PSA Limited | Information & communication | 2014 |
| Defib Emporium Ltd | Wholesale & retail | 2025 |
| Defining Talent Ltd | Administrative & support | 2021 |
| Definition Data Limited | Other services | 2014 |
| Definitive Motorcycle Works Limited | Wholesale & retail | 2021 |
| Deformation Mechanica and Medical Analytica Services Ltd | Professional & scientific | 2019 |
| Degear Ltd | Wholesale & retail | 2026 |
| Degen Labs Ltd | Manufacturing | 2022 |
| Degree Installations Ltd | Manufacturing | 2021 |
| DEH Electrical Services Ltd | Construction | 2026 |
| Dehyji Solutions Ltd | Wholesale & retail | 2025 |
| Dejiakponna Properties Ltd | Real estate | 2025 |
| Deker Management Services Limited | Households | 2007 |
| Dekorhaus Ltd | Wholesale & retail | 2024 |
| Dekton Limited | Wholesale & retail | 2020 |
| Delahay Richards Associates Ltd | Professional & scientific | 2022 |
| Delamain Ogilby Limited | Other services | 2011 |
| Delamore Ltd | Wholesale & retail | 2017 |
| Delano Birmingham 2009 Limited | Health & social care | 2008 |
| Delano Doncaster 2010 Limited | Health & social care | 2009 |
| Delano Investments Limited | Health & social care | 2005 |
| Delano Leeds 2009 Limited | Health & social care | 2007 |
| Delano Liverpool 2007 Limited | Health & social care | 2007 |
| Delano Sutton 2007 Limited | Health & social care | 2007 |
| Delano Tipton 2007 Limited | Health & social care | 2007 |
| Delbridge Distributions Ltd | Wholesale & retail | 2026 |
| Delectablemenu and Party Packs Limited | Hospitality | 2026 |
| Delemont Ltd | Manufacturing | 2025 |
| Deli at Greystones Limited | Hospitality | 2025 |
| Delicious Clam Limited | Information & communication | 2021 |
| Delight Academic Coaches Limited | Education | 2018 |
| Delight Care Properties Limited | Real estate | 2019 |
| Delight Care Services Limited | Health & social care | 2016 |
| Delight Support Services Ltd | Administrative & support | 2022 |
| Delilah BON Limited | Information & communication | 2023 |
| Delimack Events Limited | Hospitality | 2026 |
| Delivamoo Ltd | Wholesale & retail | 2024 |
| Delivery Driver Rentals Ltd | Administrative & support | 2025 |
| Delivery Drop Ltd | Hospitality | 2020 |
| Dell Brothers Builders (SW) Limited | Construction | 2013 |
| Delmore House Management Company Limited | Households | 2003 |
| Delon's Autos Ltd | Wholesale & retail | 2026 |
| Delph Court Management Limited | Households | 1985 |
| Delphine Services Limited | Construction | 2025 |
| Delta Building Systems Limited | Construction | 2023 |
| Delta Business Continuity Management Limited | Professional & scientific | 2025 |
| Delta Contract Solutions Ltd | Construction | 2024 |
| Delta Medical International Ltd | Wholesale & retail | 2015 |
| Delta Oasis Ltd | Wholesale & retail | 2025 |
| Delta Precision Engineering North East Limited | Manufacturing | 2011 |
| Delta Red Limited | Health & social care | 2018 |