| Devaglade Limited | Health & social care | 1992 |
| Devana Limited | Administrative & support | 2019 |
| Devany Medical Limited | Health & social care | 2018 |
| Develop Together Ltd | Extraterritorial | 2024 |
| Developher Limited | Professional & scientific | 2025 |
| Developing Experts Limited | Information & communication | 2015 |
| Developing Hughes and Associates Ltd | Other services | 2025 |
| Developing Solutions Ltd | Professional & scientific | 2013 |
| Deviate Hub Ltd | Information & communication | 2024 |
| Devjelly Ltd | Information & communication | 2016 |
| Devlin Holdings Ltd | Financial services | 2023 |
| Devlin Plummer Stained Glass Limited | Construction | 2009 |
| Devlukia Properties Limited | Real estate | 2014 |
| Devon Curtis Ltd | Real estate | 2013 |
| Devonauts Limited | Professional & scientific | 2015 |
| Devops IT Ltd. | Information & communication | 2014 |
| DEW Holdings Limited | Information & communication | 2016 |
| Dewberry Developments Limited | Real estate | 2008 |
| Dewberry Group Ltd | Real estate | 2025 |
| Dewing Grain Limited | Agriculture & fishing | 2011 |
| Dewing Properties Limited | Construction | 2015 |
| Dewing Site Services Limited | Construction | 2008 |
| Dewing Storage Limited | Manufacturing | 2019 |
| Dewmore Limited | Information & communication | 2007 |
| Dewsbury 1 LLP | | 2013 |
| Dewyatt Financial Services Ltd. | Financial services | 2017 |
| Dexola Studio Ltd | Information & communication | 2026 |
| Dexter Vision Limited | Health & social care | 2023 |
| Dexters Interiors Limited | Administrative & support | 2022 |
| DF Global Services Ltd | Professional & scientific | 2018 |
| Dfih Limited | Real estate | 2023 |
| Dfka Intermediate Limited | Professional & scientific | 2006 |
| Dfka UK Holdings Limited | Professional & scientific | 2010 |
| Dflc Electrical Ltd | Construction | 2022 |
| DFM Properties East Anglia Ltd | Real estate | 2025 |
| DFP Consulting Limited | Information & communication | 2013 |
| DFR Commerce Limited | Wholesale & retail | 2025 |
| DG Bakery Ltd | Hospitality | 2024 |
| DG Barber Property Limited | Real estate | 2012 |
| DG Events and Shows Limited | Wholesale & retail | 2025 |
| Dgbm Limited | Professional & scientific | 2013 |
| DGD Power Services Limited | Construction | 2023 |
| DGG Activities Ltd | Transport & logistics | 2020 |
| Dggw Holdings Limited | Financial services | 2024 |
| Dgphe & Barnards Renewables Ltd | Construction | 2021 |
| DH Autos Solutions Ltd | Wholesale & retail | 2018 |
| DH Brickwork & General Building Ltd | Construction | 2025 |
| DH Energy Solutions Ltd | Mining & quarrying | 2023 |
| DH Fleet Engineering Limited | Manufacturing | 2011 |
| DH Glazing Ltd | Construction | 2022 |
| DH Refurb Service Ltd | Other services | 2025 |
| Dhanjal Investments Limited | Real estate | 2013 |
| Dharda Limited | Hospitality | 2025 |
| Dharshivi Limited | Health & social care | 2003 |
| Dhchc Ltd | Health & social care | 2025 |
| Dhdr Systems Limited | Manufacturing | 2007 |
| Dhillon-Consulting Ltd | Professional & scientific | 2015 |
| Dhimani Botanicals Ltd | Wholesale & retail | 2026 |
| Dhliwayobubz Ltd | Health & social care | 2016 |
| Dhruv Tech Limited | Professional & scientific | 2019 |
| DHS Landscaping Limited | Administrative & support | 2013 |
| DHS Plumbing & Heating Ltd | Construction | 2023 |
| Dhviuk Ltd | Professional & scientific | 2019 |
| DI Battista Ltd | Health & social care | 2024 |
| Diades Engineering Ltd | Professional & scientific | 2015 |
| Dial House RTM Company Limited | Households | 2021 |
| Dialogue Content Marketing Limited | Information & communication | 2021 |
| Dialogue Media Group Limited | Financial services | 2025 |
| Diamatrix Ltd | Manufacturing | 2023 |
| Diamond Aerospace Training Ltd | Transport & logistics | 2010 |
| Diamond Blocks Ltd | Manufacturing | 2015 |
| Diamond Cleaning Ltd | Administrative & support | 2023 |
| Diamond Controls Limited | Manufacturing | 2000 |
| Diamond Cuts Barbers Limited | Administrative & support | 2011 |
| Diamond Fabrications and Pipework Limited | Manufacturing | 2021 |
| Diamond Group UK Ventures Ltd | Information & communication | 2025 |
| Diamond Heating Limited | Construction | 2004 |
| Diamond Land & Property Limited | Real estate | 2010 |
| Diamond Lawn LLP | | 2019 |
| Diamond Pro Films Ltd | Wholesale & retail | 2026 |
| Diamond Services (EA) Ltd | Manufacturing | 2008 |
| Diamond Shine Professional Cleaning Group Ltd | Administrative & support | 2021 |
| Diamond Ship Management (UK) Limited | Information & communication | 2013 |
| Diamond Technology Solutions Limited | Information & communication | 2002 |
| Diamondfitness Ltd | Arts & recreation | 2024 |
| Dianarose Care Limited | Health & social care | 2021 |
| Diatron Assembly Systems Limited | Manufacturing | 1990 |
| Dick Seaman Farms Limited | Agriculture & fishing | 1981 |
| Dick the Barber Limited | Real estate | 2004 |
| Dickerson&Summers Ltd | Wholesale & retail | 2026 |
| Dickinson in England Limited | Education | 2019 |
| Dickinson Property Group Norfolk Ltd | Construction | 2025 |
| Dicko's Services Ltd | Other services | 2019 |
| Dicks Restaurant Limited | Hospitality | 2023 |
| Dicle Limited | Other services | 2025 |
| Dictating Solutions (N.W.) Ltd | Administrative & support | 2008 |
| Dida Car Wash (Winchester) Limited | Administrative & support | 2017 |
| Didi's Cleaning Services Limited | Administrative & support | 2024 |
| Didyma ( Norwich ) Ltd | Hospitality | 2026 |
| DIE Technology Limited | Extraterritorial | 1983 |