| Daylight Core Ltd | Health & social care | 2026 |
| DAZ Steel’S Ltd | Manufacturing | 2022 |
| Dazzs Holding Ltd | Health & social care | 2025 |
| DB Consultant Engineering Ltd | Professional & scientific | 2019 |
| DB Digital Consultancy Ltd | Information & communication | 2019 |
| DB HE Advocate and Consultancy Ltd | Education | 2024 |
| DB Investments (YKS) Ltd | Real estate | 2023 |
| DB Pet Services Ltd | Wholesale & retail | 2020 |
| DB Private Practice Limited | Health & social care | 2015 |
| DB TEC Limited | Construction | 2004 |
| DB13 Decoration Ltd | Construction | 2025 |
| DBR Properties Limited | Real estate | 2009 |
| DC Collective Limited | Professional & scientific | 2024 |
| DC Deep Clean Ltd | Administrative & support | 2025 |
| DC Inspection Consultancy Limited | Professional & scientific | 2022 |
| DC Sales Consultancy Ltd | Wholesale & retail | 2025 |
| DC21 (Group) Limited | Energy | 2012 |
| DC21 (Operations) Limited | Manufacturing | 2012 |
| DC21 Engineering Limited | Manufacturing | 2019 |
| DC21 Jupiter SPV Limited | Professional & scientific | 2015 |
| DC21 Limited | Energy | 2009 |
| DC21 Mars SPV Limited | Energy | 2015 |
| DC21 Saturn SPV Limited | Professional & scientific | 2015 |
| DC21 TOW Top Farm Limited | Extraterritorial | 2014 |
| DC21 Venus SPV Limited | Energy | 2013 |
| DCF Building Solutions Ltd | Construction | 2015 |
| DCF Property Solutions Ltd | Real estate | 2017 |
| DCK Courier Ltd | Transport & logistics | 2025 |
| DCM US Multi-Family Homes Holdings Limited | Financial services | 2020 |
| Dconsult Limited | Professional & scientific | 2025 |
| Dcor Management Ltd | Real estate | 2020 |
| DCS (Electrical & Data) Limited | Energy | 2012 |
| Dcsi Limited | Information & communication | 2008 |
| DD Brothers Services Ltd | Construction | 2023 |
| DD Painting Services Ltd | Construction | 2022 |
| DD Trading Ltd | Wholesale & retail | 2017 |
| Dd's Sandwiches and Bakery Ltd | Wholesale & retail | 2025 |
| DD8 Hospitality Ltd | Hospitality | 2021 |
| DDB Holdings Ltd | Professional & scientific | 2025 |
| DDP Retail Ltd | Wholesale & retail | 2025 |
| DE Elec Ltd | Real estate | 2019 |
| DE Griz Limited | Administrative & support | 2015 |
| DE Offshore Electrical Limited | Mining & quarrying | 2013 |
| DE Pelou Group Ltd | Professional & scientific | 2016 |
| DE Royale Live Band Ltd | Information & communication | 2025 |
| Deacon Star Properties Limited | Real estate | 2025 |
| Deals DEN Ltd | Wholesale & retail | 2022 |
| Deals on the Move Ltd | Wholesale & retail | 2024 |
| Dealsify Enterprise Ltd | Wholesale & retail | 2023 |
| Dean's Plumbers Limited | Wholesale & retail | 1995 |
| Dearnley Management Ltd | Real estate | 2023 |
| Debnam House Limited | Wholesale & retail | 2019 |
| DEC Group UK Ltd | Manufacturing | 2006 |
| Decamps Services Limited | Construction | 2025 |
| Decello Ltd | Financial services | 2025 |
| Declan Storey Ltd | Construction | 2019 |
| Decorro Ltd | Construction | 2025 |
| DEE Fadez Hair Academy Ltd | Education | 2022 |
| DEE House Maintenance Limited | Construction | 2018 |
| Deeley Mobility Services Ltd | Wholesale & retail | 2020 |
| Deenovaa Limited | Wholesale & retail | 2026 |
| Deep Care Innovation Limited | Hospitality | 2024 |
| Deer Hill Court Management Company Ltd | Households | 2025 |
| Deer Hill Estates Limited | Real estate | 1986 |
| Deerlands Property Ltd | Real estate | 2026 |
| Dee’S African Cuisine & Lounge Ltd | Hospitality | 2026 |
| Defence Facilities Ltd | Administrative & support | 2025 |
| Definite Labs Ltd | Information & communication | 2023 |
| Definition of Done Ltd | Information & communication | 2022 |
| Defyre Limited | Information & communication | 2024 |
| Deighton Care Ltd | Real estate | 2023 |
| Deighton Into Sport Project | Arts & recreation | 2010 |
| Dein Sports Ltd | Manufacturing | 2024 |
| Dekoreya Ltd | Extraterritorial | 2024 |
| DEL SOL Group Limited | Financial services | 2022 |
| Delamere Gardens Management Company Limited | Real estate | 2011 |
| Delevingne Developments Limited | Construction | 2016 |
| Delevingne Flockton Limited | Construction | 2021 |
| Delicious Desserts Express Limited | Wholesale & retail | 2023 |
| Delicious Desserts Limited | Hospitality | 2010 |
| Deliver 2 Ltd | Transport & logistics | 2026 |
| Delivered Directly Ltd | Wholesale & retail | 2021 |
| Delivering Value Limited | Professional & scientific | 2021 |
| Delixc Limited | Wholesale & retail | 2025 |
| Delorium Ltd | Professional & scientific | 2023 |
| Delph Gate Limited | Real estate | 2018 |
| Delph House Farm Limited | Agriculture & fishing | 1963 |
| Delta Business Services Limited | Information & communication | 2024 |
| Delta Nexis Limited | Professional & scientific | 2023 |
| Delta QS Ltd | Information & communication | 2020 |
| Delta Union Limited | Water & waste | 2014 |
| DELTA101 Ltd | Wholesale & retail | 2022 |
| Deltacross Trading Limited | Information & communication | 1999 |
| Deluxe Beds (UK) Ltd | Extraterritorial | 2013 |
| Deluxe Beds Ltd | Manufacturing | 1998 |
| Deluxuria Ltd | Real estate | 2021 |
| Dembossa Ltd | Information & communication | 2024 |
| Demolition West Yorkshire Ltd | Construction | 2013 |
| Demon Holdings Ltd | Administrative & support | 2018 |
| Denby Dale Carpets Limited | Wholesale & retail | 2004 |