| Deal GEN Limited | Information & communication | 2021 |
| Deal-H Limited | Wholesale & retail | 2017 |
| Dealluxe Limited | Wholesale & retail | 2025 |
| Dean Bradley Limited | Real estate | 2016 |
| Dean Leigh Limited | Information & communication | 2003 |
| Deansgate Corporation LLP | | 2015 |
| Dearne Stanmore Residents Limited(The) | Construction | 1982 |
| Debajen Holdings Ltd | Financial services | 2023 |
| Debate International Limited | Wholesale & retail | 2001 |
| Debut Group Limited | Financial services | 2025 |
| Debut Management Consulting Limited | Professional & scientific | 2021 |
| Debut Property Management Limited | Real estate | 2021 |
| Dec&B Ltd | Construction | 2026 |
| Decagon Health Ltd | Health & social care | 2025 |
| Decagon Holdings Ltd | Financial services | 2023 |
| Decagon Property Ltd | Real estate | 2024 |
| Decagon Solutions Ltd | Professional & scientific | 2023 |
| Deccan Assets Ltd | Real estate | 2020 |
| Deccan Junction Ltd | Hospitality | 2024 |
| Deccan Lounge Ltd | Hospitality | 2024 |
| Dechun Limited | Information & communication | 2019 |
| Decision Savvy Ltd | Professional & scientific | 2025 |
| Declassical Studio Ltd | Education | 2023 |
| Declutter My Space Franchise Network Limited | Professional & scientific | 2024 |
| Declutter My Space Gives Back Limited | Health & social care | 2024 |
| Declutter My Space Ltd | Administrative & support | 2024 |
| Decmatic Limited | Professional & scientific | 2017 |
| Deco Cemento Ltd. | Construction | 2015 |
| Decor&Magnum Construction Limited | Construction | 2016 |
| Decorative Decorators Ltd | Construction | 2012 |
| Deedan Services Limited | Health & social care | 2013 |
| Deejeys' Food Limited | Wholesale & retail | 2025 |
| Deeko Designs Limited | Information & communication | 2011 |
| Deep Waters Capital Limited | Financial services | 2025 |
| Deeppulse Ltd | Administrative & support | 2022 |
| Deepr Clothing Ltd | Wholesale & retail | 2025 |
| Deer Lake Holdings Ltd | Financial services | 2022 |
| Dees Properties Ltd | Real estate | 2023 |
| Deeshao Enterprise Ltd | Hospitality | 2026 |
| Defending Angels Security Solutions Limited | Administrative & support | 2023 |
| Dehzad Limited | Other services | 2024 |
| Deifts Advanced Analytics Ltd | Professional & scientific | 2025 |
| Deiviam Ltd | Information & communication | 2012 |
| Dekarle 2 Limited | Construction | 2025 |
| Dekarle 3 Limited | Construction | 2025 |
| Dekarle Limited | Construction | 1988 |
| Deki Design Ltd | Administrative & support | 2016 |
| Deksan Wood Flooring Ltd | Construction | 2025 |
| DEL Medical Ltd | Health & social care | 2023 |
| Delaware Consulting Limited | Professional & scientific | 2019 |
| Delderfieldcare Ltd | Public administration | 2025 |
| Deli Cheers Limited | Hospitality | 2024 |
| Delicacy of East Ltd | Hospitality | 2019 |
| Delicat Trade LP | | 2017 |
| Delicii-Delicii Limited | Manufacturing | 2018 |
| Deliya Foods Ltd | Wholesale & retail | 2025 |
| Delmac Ventures Limited | Health & social care | 2007 |
| Delta GAS and Power Limited | Energy | 2023 |
| Delta Highways and Consultancy Ltd | Professional & scientific | 2025 |
| Delta One Trading Limited | Education | 2023 |
| Delta Q Trading Ltd | Financial services | 2017 |
| Delta Technology Ltd | Wholesale & retail | 2003 |
| Deltafox Data Ltd | Information & communication | 2026 |
| Deltagain Ltd | Information & communication | 2013 |
| Deltaticker Ltd | Information & communication | 2012 |
| Deltax Management Limited | Other services | 2004 |
| Deluxe Aesthetics Academy Ltd | Other services | 2017 |
| Deluxe Nails 159 Ltd | Other services | 2025 |
| Deluxe RM Ltd | Transport & logistics | 2021 |
| Demi Consulting Ltd | Construction | 2015 |
| Deminic Limited | Wholesale & retail | 2001 |
| Demoway Construction Services Limited | Water & waste | 2015 |
| Dempsey Management Company Ltd | Real estate | 2024 |
| Demyraas Estate Limited | Real estate | 2025 |
| DEN Education Ltd | Education | 2025 |
| Denbeech Ltd | Construction | 2014 |
| Denes Electrical Ltd | Construction | 2014 |
| Denewood Utilities Ltd | Construction | 2024 |
| Dengteng Ltd | Information & communication | 2021 |
| Denim Farm Limited | Manufacturing | 2017 |
| Denimhair Limited | Other services | 2010 |
| Dennis Anthony Holdings Limited | Professional & scientific | 1983 |
| Dennis L Paine Ltd | Health & social care | 2021 |
| Dental Arts Studio-Clapham (Dental Care) Limited | Health & social care | 2010 |
| Dental Design Holdings Ltd | Health & social care | 2022 |
| Dentaway Services Ltd | Information & communication | 2019 |
| Denzel's Property Management Limited | Real estate | 2017 |
| DEO Malanog Ltd | Health & social care | 2014 |
| Department of Good Ideas Limited | Construction | 2004 |
| Dephect Limited | Wholesale & retail | 2007 |
| Derby House Residents (Pinner) Limited | Households | 1973 |
| Dereham Developments Limited | Administrative & support | 1971 |
| Derek Stark Construction Management Ltd | Construction | 2015 |
| Derek the Dog Limited | Professional & scientific | 2024 |
| Dermacare London Ltd | Health & social care | 2024 |
| Derrycahill Ltd | Professional & scientific | 2019 |
| Desai Business Consultancy Limited | Professional & scientific | 2014 |
| Desany Ltd | Wholesale & retail | 2018 |
| Desco Developments Limited | Real estate | 1980 |
| Design & Build Builders Ltd | Construction | 2015 |