| Darlington SC Ltd | Real estate | 2022 |
| Darrell Watson Ltd | Construction | 2013 |
| Darren Beardsworth Ltd | Professional & scientific | 2017 |
| Darren Finney Builders Limited | Construction | 2016 |
| Darren Whitman Associates Limited | Professional & scientific | 2004 |
| Darsco Limited | Professional & scientific | 2019 |
| Darshi Limited | Real estate | 2024 |
| Dart BMS Ltd | Other services | 2022 |
| Darts Team Limited | Extraterritorial | 2025 |
| Darwan Properties Ltd | Real estate | 2025 |
| Darwen & Devine Ltd | Real estate | 2018 |
| DAS Preston Limited | Wholesale & retail | 2021 |
| DAS Technology Limited | Information & communication | 2024 |
| DAS Utility Services Ltd | Professional & scientific | 2015 |
| Dash Designs Ltd | Professional & scientific | 2023 |
| Dash Dynamics Ltd | Manufacturing | 2020 |
| Data Processing Limited | Information & communication | 2025 |
| Data Steps Limited | Transport & logistics | 1999 |
| Dataactive Communications Limited | Information & communication | 2004 |
| Datafrog Limited | Extraterritorial | 2021 |
| Datalouise UK Limited | Real estate | 2019 |
| Datamine Digital Limited | Information & communication | 2024 |
| Datanexus Systems Limited | Information & communication | 2026 |
| Datapandas Consulting Ltd | Information & communication | 2022 |
| Dataport Media Limited | Professional & scientific | 2010 |
| Datasolve Limited | Information & communication | 2000 |
| Dataspeed IT Solutions Ltd | Information & communication | 2018 |
| Datumra Ltd | Information & communication | 2025 |
| Dauchy Properties Ltd | Real estate | 2025 |
| Daugavpils Limited | Administrative & support | 2023 |
| DAV Legal Limited | Professional & scientific | 2022 |
| Davand Ltd | Wholesale & retail | 2015 |
| Dave Ainsworth Developments Ltd | Real estate | 2025 |
| Dave Clarke Racing Accessories Limited | Wholesale & retail | 2005 |
| Dave Norris Project Management Limited | Construction | 2020 |
| Dave ROB Design Limited | Professional & scientific | 2024 |
| Davenport Property Group Ltd | Real estate | 2023 |
| Davenport Smart Technologies Ltd | Manufacturing | 2022 |
| Davesthinol Investment Limited | Health & social care | 2025 |
| Davic Enterprises Limited | Real estate | 2016 |
| David Ashton Consultancy Services Ltd | Other services | 2015 |
| David Ball Motors Limited | Wholesale & retail | 2002 |
| David Banks Consultant Limited | Health & social care | 2017 |
| David Bowes Limited | Wholesale & retail | 2006 |
| David Burns Jewellery Limited | Wholesale & retail | 2003 |
| David C M Carter Limited | Professional & scientific | 2008 |
| David Church-Taylor Limited | Professional & scientific | 2003 |
| David COX Architects Ltd | Professional & scientific | 2002 |
| David D Electrical Ltd | Construction | 2026 |
| David Fazackerley Limited | Construction | 2003 |
| David Hall Carpets Limited | Wholesale & retail | 2003 |
| David John Interiors Limited | Manufacturing | 2007 |
| David Lawrenson (Builders) Ltd | Construction | 2004 |
| David LEE Couriers Ltd | Administrative & support | 2011 |
| David Plum & Co Ltd | Wholesale & retail | 2024 |
| David Stephenson Ltd | Other services | 2020 |
| David Tolson Partnership EOT Limited | Financial services | 2025 |
| David Tolson Partnership Limited | Professional & scientific | 2006 |
| David Wayman Flowers Limited | Wholesale & retail | 2011 |
| David Wilkinson & SON Independent Funeral Directors Ltd | Other services | 2025 |
| David Wilkinson Limited | Construction | 2015 |
| David Wright (Sales) Limited | Wholesale & retail | 2006 |
| Daviel Holdings Limited | Construction | 2019 |
| Davies & Crane Ltd | Professional & scientific | 2011 |
| Davis Capital Ltd | Administrative & support | 2016 |
| Davis Consultants Limited | Professional & scientific | 2026 |
| Davis Design Studio Limited | Professional & scientific | 2026 |
| Davison Business Solutions Ltd | Administrative & support | 2024 |
| Davosciences Limited | Health & social care | 2008 |
| DAW Cricket Limited | Professional & scientific | 2005 |
| Dawe Interiors Limited | Construction | 2021 |
| DAWES2DOORS Couriers Ltd | Transport & logistics | 2026 |
| Dawn Treader Property Limited | Real estate | 2013 |
| Daxia Limited | Financial services | 2021 |
| Daxio Limited | Wholesale & retail | 2026 |
| Daystore Limited | Information & communication | 2024 |
| Daytoday Bargain Ltd | Wholesale & retail | 2025 |
| DB CLO Limited | Wholesale & retail | 2025 |
| DB Fire & Security Ltd | Construction | 2023 |
| DB Properties NW Ltd | Real estate | 2023 |
| DBA Architects Ltd | Professional & scientific | 2018 |
| DBD Homeware Ltd | Wholesale & retail | 2024 |
| Dbnl Ltd | Construction | 2024 |
| DBS Electrical (Northwest) Limited | Construction | 2021 |
| DBTHR33 Ltd | Information & communication | 2024 |
| DC & MG Associates Limited | Professional & scientific | 2018 |
| DC Clean Group Ltd | Administrative & support | 2023 |
| DC Consultancy NW Ltd | Professional & scientific | 2018 |
| DC Engineering Solutions Limited | Manufacturing | 2020 |
| DC Optics Limited | Wholesale & retail | 2025 |
| DC Project Consulting Ltd | Professional & scientific | 2022 |
| DC Rillo Retail Limited | Wholesale & retail | 2021 |
| Dcbcomputing Retail Limited | Other services | 2011 |
| DCC Consultancy Services Ltd | Professional & scientific | 2024 |
| DCE Innovations Ltd | Professional & scientific | 2025 |
| DCG Group Limited | Manufacturing | 2021 |
| DCG Machinery Limited | Manufacturing | 2021 |
| DCH Roofing Ltd | Construction | 2025 |
| Dcit Systems Limited | Information & communication | 2007 |
| DCN Wealth Management Limited | Financial services | 2017 |