| D B Appliances Limited | Wholesale & retail | 2025 |
| D B Electrical Services Ltd | Construction | 2024 |
| D G S Mortgage Solutions Ltd | Financial services | 2006 |
| D H Dentures Ltd | Health & social care | 2022 |
| D R T Homes Ltd | Real estate | 2022 |
| D&A Drylining Ltd | Construction | 2023 |
| D&B Electrical Engineering Solutions Ltd | Construction | 2019 |
| D&C Valeting Services Ltd | Wholesale & retail | 2017 |
| D&N Building Construction Ltd | Construction | 2015 |
| D'Ashelei Ltd | Professional & scientific | 2018 |
| D'Vynne Limited | Financial services | 2012 |
| D.F.E. (UK) Limited | Education | 1998 |
| D.P.E. Productions Limited | Arts & recreation | 2016 |
| DA Gama Overseas Limited | Wholesale & retail | 2026 |
| DA Vinci LAB Limited | Manufacturing | 2015 |
| Dadm Construct Expert Ltd | Construction | 2024 |
| Daisy First AID Limited | Health & social care | 2014 |
| Dale Court Freeholders (Sale) Limited | Real estate | 2021 |
| Dale Court Freeholders Ltd | Households | 2016 |
| DAN Hubbard Casting Limited | Arts & recreation | 2014 |
| Danataugusta Bidco Limited | Professional & scientific | 2016 |
| Danataugusta PROPCO1 Limited | Real estate | 2016 |
| Danataugusta PROPCO2 Limited | Real estate | 2016 |
| Danataugusta PROPCO3 Limited | Real estate | 2016 |
| Dancing Wines LLP | | 2024 |
| Daniel 2531 Ltd | Transport & logistics | 2024 |
| Dark Matter Developments Limited | Professional & scientific | 2024 |
| Darsan Builders Ltd | Construction | 2024 |
| Dasatha Enterprise Private Limited | Manufacturing | 2023 |
| Data Kernel Ltd | Information & communication | 2019 |
| Data Optimo Limited | Information & communication | 2015 |
| Data Sourcing Solutions Ltd | Professional & scientific | 2022 |
| Datagridz UK Limited | Information & communication | 2023 |
| Datalead Limited | Other services | 2009 |
| Datta Dhar Ltd | Professional & scientific | 2025 |
| Datum Designers Ltd | Professional & scientific | 2022 |
| Dauley Designs Ltd | Professional & scientific | 2021 |
| Dave & Dale Ltd | Wholesale & retail | 2025 |
| Dave Investments Ltd | Real estate | 2024 |
| David Okoro Consulting Ltd | Professional & scientific | 2022 |
| David Trott Consulting Services Limited | Professional & scientific | 2016 |
| Davidson Constructionss Ltd | Construction | 2026 |
| Davis Iveson Limited | Wholesale & retail | 2023 |
| Dayday Travel Limited | Administrative & support | 2023 |
| Daydream Darlings Ltd | Wholesale & retail | 2024 |
| DBH Care Limited | Health & social care | 2016 |
| DCI Flooring Ltd | Construction | 2025 |
| DCL Plumbing Ltd | Construction | 2011 |
| DCP (Northern) Limited | Construction | 2009 |
| DCP Facades Limited | Construction | 2011 |
| DCP Group Holdings (UK) Ltd | Professional & scientific | 2011 |
| DCP Solutions Limited | Construction | 2011 |
| DCS Property & Maintenance Ltd | Construction | 2023 |
| Dcsc Legal Engineers Ltd | Information & communication | 2026 |
| Dealwis Consulting Limited | Financial services | 2016 |
| Deanz Ltd | Professional & scientific | 2013 |
| Deboi Capital Ltd | Real estate | 2020 |
| Deboi Entertainment Ltd | Information & communication | 2020 |
| Dedys Renovations Ltd | Real estate | 2022 |
| DEGR8 Events UK Ltd | Hospitality | 2025 |
| Dekash Properties Ltd | Real estate | 2017 |
| Delco Safety Limited | Professional & scientific | 2007 |
| Dellminster Limited | Real estate | 1984 |
| Deltaic OIL & GAS Limited | Real estate | 2006 |
| Denise ICT International Limited | Information & communication | 2020 |
| Denmark Road Management Limited | Households | 1988 |
| Dent & Hellyer Ltd | Manufacturing | 2022 |
| DEP Developments Ltd | Construction | 2014 |
| Derma Space Clinic Ltd | Other services | 2022 |
| Derp Dragon Publishing Ltd | Information & communication | 2023 |
| Desheng Co. Ltd | Other services | 2016 |
| Desire Living Ltd | Real estate | 2022 |
| Desouza Drama Limited | Education | 2024 |
| Destination Events (Holdings) Limited | Professional & scientific | 2011 |
| Destination Events Ltd. | Arts & recreation | 1999 |
| Destiny Investment Properties Ltd | Extraterritorial | 2024 |
| Devarga Limited | Professional & scientific | 2000 |
| Development Resources Limited | Information & communication | 2017 |
| Dewmead Limited | Construction | 1994 |
| DGA Mortgages Ltd | Financial services | 2019 |
| Dhcm Consulting Limited | Information & communication | 2025 |
| Dhiraj Limited | Wholesale & retail | 2019 |
| DHM Brickwork Ltd | Construction | 2023 |
| Diet Health Limited | Other services | 2017 |
| Diginomica Holdings Limited | Information & communication | 2021 |
| Diginomica Limited | Information & communication | 2013 |
| Diginou Consultancy Ltd | Professional & scientific | 2023 |
| Digital Alliance Ltd | Information & communication | 2022 |
| Digital Shelter Ltd | Information & communication | 2021 |
| Digits & Bytes Associates London Ltd | Information & communication | 2014 |
| Digits and Bytes Associates Teesside Ltd | Professional & scientific | 2020 |
| Digits and Bytes Education Foundation | Education | 2020 |
| Dignitree Ltd | Wholesale & retail | 2024 |
| Dimashqi Ltd | Wholesale & retail | 2020 |
| Dimension Interprise Limited | Other services | 2026 |
| Dimi’S Decorating Ltd | Construction | 2024 |
| Dinal Medical Limited | Health & social care | 2026 |
| Dinkerrai Management Ltd | Real estate | 2023 |
| Dinorben Management Limited | Households | 1967 |
| Dion-Ja Ltd | Wholesale & retail | 2025 |