| D-Moda Limited | Manufacturing | 2005 |
| D.& C. Contract Cars Limited | Transport & logistics | 2023 |
| D.A.K. Properties Limited | Real estate | 1986 |
| D.H. Carpentry (South West) Ltd | Manufacturing | 2018 |
| D.I. (Falmouth) Ltd | Hospitality | 2023 |
| D.S.E. Ltd. | Real estate | 1997 |
| D.W Health & Fitness Limited | Health & social care | 2024 |
| D16PP LLP | | 2025 |
| D2D Devotion Ltd | Transport & logistics | 2025 |
| D9 Limited | Wholesale & retail | 2018 |
| DA Silva Dwellings Ltd | Real estate | 2022 |
| Da'Paige Management Services Ltd | Administrative & support | 2022 |
| Daai Systems Limited | Professional & scientific | 2025 |
| Daav Properties Limited | Real estate | 2020 |
| DAB Bricklaying & General Building Ltd | Construction | 2024 |
| Dada Strategic Consulting Limited | Professional & scientific | 2014 |
| Dadmore Dairy Limited | Agriculture & fishing | 2022 |
| DAF Accounting & Consulting Ltd | Professional & scientific | 2018 |
| Dagwood Limited | Real estate | 2022 |
| Dahhan Barbers Limited | Other services | 2020 |
| Dahhans Coffee Shop Limited | Wholesale & retail | 2021 |
| Daintree SPV I Limited | Real estate | 2016 |
| Daintree SPV II Limited | Real estate | 2016 |
| Daisy and Co. Dog Walking Ltd | Other services | 2025 |
| Daisy Johansen Limited | Hospitality | 2025 |
| Dajec Limited | Extraterritorial | 2014 |
| Dakin Property Group Ltd | Real estate | 2025 |
| Dalet Properties Ltd | Real estate | 2024 |
| Dalgleish Contract Services Ltd | Construction | 2019 |
| Dalmore Consultancy Services Limited | Professional & scientific | 2015 |
| Dalter UK Limited | Wholesale & retail | 2011 |
| Dalwood Poultry Ltd | Agriculture & fishing | 2019 |
| Damijade Ltd | Administrative & support | 2025 |
| Damm Investments Limited | Real estate | 2023 |
| DAN Babei Decorators Limited | Construction | 2009 |
| DAN Cook Heating Limited | Construction | 2017 |
| DAN Hall Fitness Ltd | Public administration | 2021 |
| DAN SCI Ltd | Arts & recreation | 2013 |
| Dancing Badger Limited | Information & communication | 2011 |
| Daniel Molloy Ltd | Information & communication | 2023 |
| Daniels Medicolegal Services Ltd | Health & social care | 2019 |
| Danis Investments Ltd | Real estate | 2022 |
| Daniyel Acquisitions Limited | Financial services | 2025 |
| Dannabel Limited | Wholesale & retail | 2024 |
| Danube Consultants Limited | Real estate | 2016 |
| Danyrus Trans Ltd | Transport & logistics | 2021 |
| Darby Solutions Group Limited | Professional & scientific | 2026 |
| Darcom Limited | Construction | 2014 |
| Daris (SW) Ltd | Hospitality | 2020 |
| Dark and Grim Ltd | Wholesale & retail | 2016 |
| Dark Matter Trading Limited | Wholesale & retail | 2018 |
| Darkco Ltd | Hospitality | 2025 |
| Darke Investments Limited | Real estate | 2019 |
| Darklake Developments Limited | Construction | 2010 |
| Darkocean's Prop Shop Limited | Manufacturing | 2015 |
| Darley Road Limited | Financial services | 2019 |
| Darlgo Limited | Health & social care | 2024 |
| Darrenold Electrical Ltd | Energy | 2017 |
| Darryl-Robert Aesthetics Ltd | Health & social care | 2021 |
| Dart & Co. Limited | Construction | 2013 |
| Dart & Francis Developments Limited | Professional & scientific | 1989 |
| Dart Education Ltd | Education | 2013 |
| Dart Marine Services Ltd | Manufacturing | 2024 |
| Dart Media Limited | Information & communication | 2016 |
| Dart Properties Limited | Extraterritorial | 2001 |
| Dartex Consulting Services Limited | Administrative & support | 2013 |
| Dartmoor Thatched Cottages Ltd | Hospitality | 2018 |
| Dartmoor Tree Surgeons Ltd | Agriculture & fishing | 2003 |
| Dartmouth Vineyard Ltd | Agriculture & fishing | 2026 |
| Darts Farm Limited | Agriculture & fishing | 2001 |
| Dartsel Limited | Information & communication | 2022 |
| Darwin's Bar Ltd | Hospitality | 2024 |
| Darwood Solutions Ltd | Professional & scientific | 2026 |
| Dashboard Limited | Extraterritorial | 2022 |
| Dashells Holdings Limited | Agriculture & fishing | 2022 |
| Dashler Ltd | Professional & scientific | 2011 |
| Dass Limited | Wholesale & retail | 2020 |
| Data Curating Limited | Information & communication | 2026 |
| Datacapture Limited | Information & communication | 2006 |
| Dataportl Ltd | Information & communication | 2025 |
| Davalex Ltd | Transport & logistics | 2018 |
| Dave & BEL Home Improvements Ltd | Construction | 2024 |
| Davenport Carpentry Ltd | Construction | 2016 |
| Davey Counselling and Psychotherapy Limited | Other services | 2013 |
| David and Charles Ltd | Information & communication | 2019 |
| David Attenburrow Aviation Ltd | Professional & scientific | 2025 |
| David Boyle Limited | Administrative & support | 2014 |
| David Coates Wealth Management Limited | Financial services | 2015 |
| David Field Wealth Management Limited | Financial services | 2009 |
| David FOX Ltd | Education | 2023 |
| David Golightly Consulting Engineers Limited | Construction | 2008 |
| David H Owen Limited | Professional & scientific | 2022 |
| David Hares Landscape Architecture Limited | Agriculture & fishing | 2014 |
| David Kirk Limited | Other services | 2014 |
| David Mandel and Associates Limited | Information & communication | 2019 |
| David Pullum Photography Ltd | Professional & scientific | 2015 |
| David Silver (UK) Limited | Health & social care | 2011 |
| David Weatherly Education Limited | Education | 2013 |
| David Wright Limited | Mining & quarrying | 2024 |
| Davies Engineers Ltd | Professional & scientific | 2026 |