| Day & Night Healthcare Ltd | Administrative & support | 2019 |
| Day 5 Group Ltd | Professional & scientific | 2024 |
| Day Couriers Ltd | Transport & logistics | 2025 |
| Day Fever UK Limited | Administrative & support | 2023 |
| Dayar E Madina Halal Meat Ltd | Wholesale & retail | 2023 |
| Dayib Life Style Ltd | Administrative & support | 2025 |
| Dayofunmi Enterprises Limited | Health & social care | 2015 |
| Dayphi Limited | Professional & scientific | 2017 |
| Dayton Limited | Real estate | 2015 |
| Dazaproperties Ltd | Real estate | 2024 |
| DB Capital Consultancy Ltd | Professional & scientific | 2019 |
| DB Cleaning Services Ltd | Administrative & support | 2012 |
| DB Foods U.K. Ltd | Hospitality | 2023 |
| DB Impact Ltd | Professional & scientific | 2023 |
| DB Incorp Ltd | Administrative & support | 2022 |
| DB Local CIC | Wholesale & retail | 2023 |
| DB Pagehall Limited | Wholesale & retail | 2025 |
| DB Tree Care Ltd | Agriculture & fishing | 2015 |
| DBA Consult Limited | Professional & scientific | 2009 |
| DBA Trans Ltd | Transport & logistics | 2016 |
| DBD Planning Services Ltd | Administrative & support | 2022 |
| Dbfm Limited | Construction | 2024 |
| DBL Distribution Limited | Transport & logistics | 2002 |
| Dblessed Services Ltd | Information & communication | 2025 |
| Dbmk Medical Limited | Health & social care | 2022 |
| DBR Property Ltd | Real estate | 2017 |
| Dbrg Property Ltd | Real estate | 2024 |
| DBS Structures Limited | Construction | 2018 |
| DBT Electrical Ltd | Construction | 2017 |
| Dbtech Solutions Ltd | Information & communication | 2010 |
| DC Barbell Ltd | Arts & recreation | 2020 |
| DC Gafaa Transprt Ltd | Transport & logistics | 2025 |
| DC Plumbing South Yorkshire Ltd | Construction | 2025 |
| DC Rides Ltd | Transport & logistics | 2023 |
| DC Swiss UK Ltd | Wholesale & retail | 2008 |
| DC Tailormade Journeys Limited | Administrative & support | 2023 |
| DC Travels Ltd | Transport & logistics | 2020 |
| DC2A Ltd | Arts & recreation | 2026 |
| Dcau Homes Limited | Real estate | 2023 |
| DCG Properties Limited | Real estate | 2007 |
| DCL Commercial Ltd | Households | 2018 |
| Dclj Properties Ltd | Real estate | 2025 |
| DCM Commercial Finance Ltd | Financial services | 2020 |
| DCN Group Ltd | Financial services | 2024 |
| DCO Property Solutions Ltd | Real estate | 2025 |
| DCP & Solutions Limited | Transport & logistics | 2026 |
| DCR Joinery Solutions Ltd | Construction | 2022 |
| Dcro Consulting Ltd | Public administration | 2018 |
| DCS Engineering Services Ltd | Professional & scientific | 2015 |
| DCS Ventures Limited | Information & communication | 2025 |
| Dcss Garages Limited | Wholesale & retail | 2013 |
| DD Future Marketing Ltd | Information & communication | 2025 |
| DD Globel Services Ltd | Administrative & support | 2026 |
| DD Prime Property Management Limited | Real estate | 2025 |
| DD River Bar Limited | Hospitality | 2017 |
| DD Top Renovation Limited | Construction | 2021 |
| Ddaeig Ltd | Arts & recreation | 2022 |
| Ddbs & Construction Limited | Construction | 2021 |
| DDC Technology Limited | Education | 2010 |
| Ddid Ltd | Construction | 2022 |
| Ddmm Sports Commentary Ltd | Arts & recreation | 2023 |
| DDR Building Limited | Construction | 2017 |
| Ddro Properties Limited | Real estate | 2024 |
| Ddup International Ltd | Transport & logistics | 2019 |
| DDZ Interiors Ltd | Wholesale & retail | 2017 |
| DE Fabrications Ltd | Manufacturing | 2025 |
| DE James PVT Ltd | Hospitality | 2024 |
| DE Lisle Holdings Limited | Professional & scientific | 2000 |
| DE Medical Limited | Health & social care | 2016 |
| DE Novo Energy Ltd | Construction | 2021 |
| DE Pass Montgomery Limited | Professional & scientific | 2016 |
| DE Praise Afro-Caribbean Foods Limited | Wholesale & retail | 2023 |
| DE Reve Creative Ltd | Information & communication | 2022 |
| DE Sportz&Dance Ltd | Arts & recreation | 2015 |
| DE Thrive Ltd | Real estate | 2026 |
| DE Ville & Co Limited | Health & social care | 2010 |
| Dead Beat Club Ltd | Arts & recreation | 2011 |
| Dead Earnest Theatre | Arts & recreation | 1996 |
| Dead EYE Limited | Professional & scientific | 2023 |
| Dead Parrot Beer Company Ltd | Manufacturing | 2018 |
| Deafwish Limited | Professional & scientific | 2024 |
| Dealer Management Services Limited | Information & communication | 1997 |
| Dean Mirfin Hospitality Ltd | Hospitality | 2020 |
| Dean Royles Ltd | Administrative & support | 2018 |
| Dean Walker Limited | Hospitality | 2015 |
| Deans Family Butchers Ltd | Wholesale & retail | 2025 |
| Dearneside (Holdings) Limited | Real estate | 2020 |
| Dearneside Fabrications Limited | Manufacturing | 1994 |
| Dearnevale Health Care Limited | Health & social care | 2004 |
| Dearnevale SPV Limited | Health & social care | 2018 |
| DEB Moore Associates Ltd | Health & social care | 2006 |
| Deb-E-Tone Soft Furnishings Limited | Wholesale & retail | 2010 |
| Debacle Limited | Arts & recreation | 2013 |
| Debbie at Porters Limited | Other services | 2011 |
| Debbie Carlisle Ltd | Manufacturing | 2011 |
| Debonair Care Solutions Ltd | Health & social care | 2025 |
| Deborah Mullins Training Ltd | Professional & scientific | 2013 |
| Debosstudio Limited | Wholesale & retail | 2024 |
| Debra Kelly Baby Care Ltd | Information & communication | 2019 |
| Debrah J Flowers Ltd | Professional & scientific | 2019 |