| David Lockwood Ltd | Information & communication | 2022 |
| Davies Garden Care Ltd | Administrative & support | 2025 |
| Dawntreader (Poole) Limited | Transport & logistics | 2012 |
| Dawu Consultancy Limited | Information & communication | 2022 |
| Day Holdings Ltd | Professional & scientific | 2024 |
| Daylec Electrical Solutions Ltd | Construction | 2024 |
| Daylight Industries Ltd | Information & communication | 2021 |
| Days Cleaning Services Limited | Administrative & support | 2026 |
| Days Transport/Services Ltd | Transport & logistics | 2019 |
| Dazzvideos Limited | Information & communication | 2019 |
| DB Consulting (Bournemouth) Limited | Professional & scientific | 2017 |
| DBC Engineering Limited | Professional & scientific | 2019 |
| Dblk Limited | Information & communication | 2022 |
| DBM Property Management Limited | Real estate | 2020 |
| Dbqc Ltd | Administrative & support | 2013 |
| DC Electrical Design Ltd | Professional & scientific | 2025 |
| Dcht Consulting Limited | Information & communication | 2024 |
| Dctechuk Ltd | Information & communication | 2021 |
| DDI Projects Limited | Construction | 2012 |
| DE Bono Property Management Ltd | Real estate | 2024 |
| De-Jai Tech Ltd | Information & communication | 2015 |
| Dead Brilliant Ltd | Information & communication | 2023 |
| Dealers Club Ltd | Education | 2023 |
| Dealers League Ltd | Information & communication | 2018 |
| Dean & SON Carpentry Ltd | Manufacturing | 2024 |
| Dean and Teague Properties Ltd | Real estate | 2026 |
| Dean W Marsh Ltd | Professional & scientific | 2012 |
| DEB Actuarial Ltd | Professional & scientific | 2025 |
| Debbi.Io Limited | Information & communication | 2024 |
| Debbie Does Ideas & Art Direction Limited | Professional & scientific | 2007 |
| Deborah Anne Ltd | Professional & scientific | 2017 |
| Decibel International Holdings Ltd | Financial services | 2026 |
| Decoding Layers Limited | Information & communication | 2025 |
| Decon Lead Ltd | Information & communication | 2022 |
| Deep Blue Software Solutions Ltd | Information & communication | 2014 |
| Deepika Limited | Information & communication | 2016 |
| Defence Optical Limited | Professional & scientific | 2004 |
| Delimited Consulting Ltd | Information & communication | 2018 |
| Deliverygood Ltd | Construction | 2019 |
| Delkeith Court Management Limited | Households | 1973 |
| Dell Services Ltd | Households | 2024 |
| Delpa Ltd | Information & communication | 2021 |
| Delphi Consultancy Limited | Professional & scientific | 2024 |
| Delphyc Limited | Professional & scientific | 2024 |
| Delta 19 Limited | Information & communication | 2019 |
| Delta Datum Limited | Information & communication | 2022 |
| Delta Electrical and Solar PV Services Ltd | Construction | 2023 |
| Delta Rubber Holdings Limited | Financial services | 2019 |
| Delta Rubber Limited | Manufacturing | 2006 |
| Deluxe Days Event Co Ltd | Hospitality | 2024 |
| Dena Michelli Executive Development Limited | Professional & scientific | 2012 |
| Densham Technology Ltd | Information & communication | 2018 |
| Dental Business Associates Limited | Professional & scientific | 2024 |
| Denticure Limited | Health & social care | 1990 |
| Deora Limited | Professional & scientific | 2024 |
| Deploy Care Ltd | Health & social care | 2020 |
| Deptford Risk Systems Limited | Information & communication | 2026 |
| Derma Bathe Limited | Manufacturing | 2016 |
| Desaign Studios Limited | Administrative & support | 2023 |
| Design Make Send Ltd | Manufacturing | 2019 |
| Design Management Limited | Professional & scientific | 2018 |
| DESIGN3D Ltd | Manufacturing | 2020 |
| Desimfo Ltd | Professional & scientific | 2014 |
| Developmyplan Limited | Extraterritorial | 2013 |
| Devops 42 Limited | Information & communication | 2025 |
| Devops R US Ltd | Professional & scientific | 2019 |
| Devork Ltd | Information & communication | 2011 |
| Dewtec Ltd | Information & communication | 2016 |
| Dexorera Limited | Information & communication | 2008 |
| DG Infinity Properties Limited | Real estate | 2026 |
| DGK Engineering Solutions Limited | Manufacturing | 2025 |
| DHA Repair Ltd | Other services | 2025 |
| DHV Engineering Limited | Professional & scientific | 2024 |
| Diadem Operations Ltd | Information & communication | 2024 |
| Diamond Construction (UK) Limited | Construction | 2009 |
| Diamond CUT Refinishing Holdings Limited | Financial services | 2018 |
| Diane Wingate Ltd | Health & social care | 2018 |
| DID Teach Limited | Administrative & support | 2024 |
| DIE and Tool 1974 Co Ltd. | Public administration | 2018 |
| Diffusion Properties Limited | Real estate | 2016 |
| Digifreelancer Limited | Professional & scientific | 2024 |
| Digilinc Ltd | Information & communication | 2019 |
| Digimed Solutions Limited | Information & communication | 2024 |
| Digistratex Limited | Information & communication | 2025 |
| Digital AI Solutions Limited | Information & communication | 2024 |
| Digital Care Consulting Limited | Information & communication | 2023 |
| Digital Configurator Limited | Professional & scientific | 2025 |
| Digital Energy Revolution Ltd | Energy | 2023 |
| Digital Fauna Limited | Information & communication | 2002 |
| Digital Llama Ltd | Information & communication | 2023 |
| Digital Meridian Limited | Information & communication | 2023 |
| Digital Transformation Advisory Limited | Information & communication | 2019 |
| Digital Wing Limited | Information & communication | 2018 |
| Digitalion Limited | Wholesale & retail | 2020 |
| Dine Hampshire Ltd | Hospitality | 2025 |
| Dinnerwithshaun Ltd | Agriculture & fishing | 2023 |
| Dipono Ltd | Financial services | 2024 |
| Direct Design Consulting Ltd | Other services | 2018 |
| Direct Skips UK Limited | Water & waste | 2025 |
| Directions Coaching Ltd | Education | 2016 |