| D.J. Thomas & Co. Limited | Professional & scientific | 2005 |
| D.K.C. Developments Limited | Construction | 2022 |
| D.R.S. Management & Financial Ltd. | Professional & scientific | 1998 |
| D2A Ltd | Real estate | 2021 |
| Dads Tyres Limited | Extraterritorial | 2007 |
| Daffoo Property Investment Ltd | Real estate | 2025 |
| Dagt Consulting Limited | Professional & scientific | 2019 |
| Dagt SPV1 Limited | Professional & scientific | 2019 |
| Daikoku Ramen Gloucester Ltd | Hospitality | 2024 |
| Daily Grind Cafe & Bar Ltd | Hospitality | 2025 |
| Daisy Grace Ltd | Real estate | 2024 |
| Dajon Interiors Limited | Construction | 1998 |
| Dajon Limited | Extraterritorial | 2006 |
| Dalex UK Limited | | 2008 |
| Dalglish Bidco Limited | Financial services | 2018 |
| Dalziel Properties Ltd | Real estate | 2025 |
| Damai Studios Limited | Professional & scientific | 2026 |
| Damascusoak Ltd | Wholesale & retail | 2026 |
| DAN Adams Electrical Limited | Construction | 2016 |
| DAN Waring Ltd | Construction | 2016 |
| DAN Young Agricultural Buildings & Construction Limited | Construction | 2014 |
| Danamy Consulting Ltd | Information & communication | 2024 |
| Danew Construction Ltd | Construction | 2026 |
| Dangala Home Care Limited | Health & social care | 2012 |
| Danhouse Security Limited | Other services | 1993 |
| Daniel Folley Digital Ltd | Professional & scientific | 2022 |
| Daniel Jones Properties Ltd | Real estate | 2025 |
| Daniel Shearman Construction Limited | Construction | 2023 |
| Danielfitter Ltd | Manufacturing | 2025 |
| Daniellcottages Ltd | Real estate | 2022 |
| Danipaws Pet Services Ltd | Other services | 2024 |
| Dannelse Ltd | Education | 2024 |
| Danrae Properties Ltd | Real estate | 2026 |
| Dansdom Properties Ltd | Real estate | 2022 |
| Danube UK Limited | Wholesale & retail | 2008 |
| Dapper Enterainment Ltd | Wholesale & retail | 2022 |
| Dara Connect Limited | Information & communication | 2015 |
| Dare Coaching Ltd | Professional & scientific | 2017 |
| Darius & Maya Trans Ltd | Administrative & support | 2016 |
| Dark Barn Management Company Limited | Households | 2016 |
| Dark Horse Agency Holdings Limited | Financial services | 2024 |
| Dark Horse Agency Limited | Professional & scientific | 1991 |
| Dark Horse Holdings Limited | Professional & scientific | 1998 |
| Dark Hours Media Ltd | Information & communication | 2024 |
| Dark Poets Club Limited | Arts & recreation | 2026 |
| Darkwoods Consulting Ltd | Professional & scientific | 2013 |
| Darren Hendry Bricklaying & Construction Ltd | Construction | 2021 |
| Dartech IT Solutions Ltd | Information & communication | 2018 |
| Darul Qasim | Education | 1998 |
| Daryl Stroud Engineering Consultancy Limited | Professional & scientific | 2024 |
| Data Alive Ltd | Professional & scientific | 2002 |
| Data Centrum Ltd | Information & communication | 2009 |
| Data Cube Consultants Ltd. | Information & communication | 2010 |
| Data Retention Systems Ltd | Information & communication | 2010 |
| Data Validate Ltd | Information & communication | 2025 |
| Data VALIDATE8 Ltd | Information & communication | 2025 |
| Datadial Limited | Information & communication | 1998 |
| Datasoul Ltd | Information & communication | 2016 |
| Datgold Limited | Professional & scientific | 2023 |
| Daveys Building & Maintenance Ltd | Construction | 2026 |
| David Johnson Financial Planning Ltd. | Financial services | 2012 |
| David Maxwell Hairdressing (Argyle) Ltd | Other services | 2014 |
| David Price Building Contractors Ltd | Construction | 2019 |
| David Redvers Bloodstock Ltd | Agriculture & fishing | 2007 |
| David Rees Holistic Learning Ltd | Education | 2023 |
| Davies & Sollazzi Ltd | Health & social care | 2021 |
| Davies and Partners Solicitors Limited | Professional & scientific | 2016 |
| Davison Dwellings Ltd | Real estate | 2020 |
| Davites Export Ltd | Wholesale & retail | 2016 |
| Dawn Edwin Properties Ltd | Real estate | 2026 |
| Dawson Tyre Services Limited | Administrative & support | 2002 |
| Daxion Technologies Ltd | Information & communication | 2026 |
| Day's Holdings Limited | Professional & scientific | 2005 |
| Dayicare Ltd | Administrative & support | 2021 |
| Daytona Management Company Limited | Real estate | 1981 |
| Dazzlehurst Civil Engineering Company Limited | Transport & logistics | 1982 |
| Dazzling Details Ltd | Wholesale & retail | 2024 |
| DB Bidco Limited | Financial services | 2025 |
| DB Cars (Wakefield) Ltd | Wholesale & retail | 2013 |
| DB Futures Ltd | Professional & scientific | 2022 |
| DBC Bespoke Solutions Ltd | Construction | 2020 |
| DBD Devbhoomi Limited | Hospitality | 2026 |
| DBF Electrical (Cheltenham) Limited | Construction | 2010 |
| DBS Groundworkers Limited | Construction | 2016 |
| DC CDM Limited | Construction | 2017 |
| DC Malcolm Services Ltd | Information & communication | 2022 |
| Dc-Pro Limited | Information & communication | 2020 |
| DDA Logistics Ltd | Transport & logistics | 2020 |
| Ddecks Limited | Wholesale & retail | 2018 |
| DDO Limited | Professional & scientific | 2008 |
| DE Bohunn Ltd | Health & social care | 2025 |
| Deadsmooth Developments Limited | Construction | 2023 |
| Deadsmooth Plastering and Building Company Limited | Construction | 2017 |
| Deakin's Bars Limited | Hospitality | 2024 |
| Dealfuse Ltd | Financial services | 2020 |
| Dean Accountancy Services Ltd | Professional & scientific | 2019 |
| Dean Greener Ltd | Real estate | 2018 |
| Dean Jones Mental Health Ltd | Health & social care | 2024 |
| Dean Martin Contractors Limited | Construction | 2006 |
| Dean Quarry Mineral Rights Limited | Mining & quarrying | 2014 |