| D a Pooley Ltd. | Construction | 2014 |
| D a Rogers Ltd | Transport & logistics | 2019 |
| D and I Carpentry Limited | Manufacturing | 2024 |
| D and J Jackson Cars Ltd | Transport & logistics | 2023 |
| D B Vehicle Repairs Limited | Wholesale & retail | 2023 |
| D C Groves & SON Ltd | Transport & logistics | 2024 |
| D Cavanagh Electrical Services Ltd | Construction | 2016 |
| D Clayden Services Limited | Information & communication | 2015 |
| D J Motors Ashford Ltd | Wholesale & retail | 2023 |
| D Jones Surfacing Limited | Construction | 2004 |
| D K Barber Limited | Professional & scientific | 2015 |
| D K Gray Solutions Ltd | Construction | 2026 |
| D K Risk Solutions UK Limited | Professional & scientific | 2005 |
| D Maclean Consultancy Ltd | Professional & scientific | 2022 |
| D N B Building Contractor Ltd | Construction | 2024 |
| D P Gunter Ltd | Construction | 2020 |
| D Pope Ltd | Construction | 2006 |
| D R Major Limited | Arts & recreation | 2015 |
| D R T Vehicle Services and Diagnostics Ltd | Wholesale & retail | 2019 |
| D T Cleaning & Maintenance Services Ltd | Administrative & support | 2026 |
| D Wood Building & Carpentry Ltd | Construction | 2018 |
| D&C Gleam Ltd | Health & social care | 2023 |
| D&F Swim School Ltd | Arts & recreation | 2025 |
| D&K Taylor Limited | Transport & logistics | 2023 |
| D&L Gill Limited | Real estate | 2022 |
| D&S BM Ltd | Real estate | 2026 |
| D&Z Developments Limited | Real estate | 2018 |
| D. Charles & Co Limited | Real estate | 1977 |
| D. P. Leasing Limited | Administrative & support | 2017 |
| D.A.D. (U.K.) Limited | Manufacturing | 1996 |
| D.Bowman Ltd | Other services | 2018 |
| D.C.M Brickwork & Building Services Limited | Construction | 2020 |
| D.D. Williamson (U.K.) Limited | Wholesale & retail | 2003 |
| D.G.Mortimer & Co.Limited | Manufacturing | 1957 |
| D.S Bespoke Limited | Construction | 2019 |
| D.White Carpentry Ltd | Construction | 2021 |
| D2D Properties Ltd. | Construction | 2015 |
| D2M Plumbing & Heating Ltd | Construction | 2021 |
| DA Base Community Interest Company | Other services | 2018 |
| DA Base Education Ltd | Other services | 2024 |
| Daata Ganj Baksh Investments Limited | Hospitality | 2012 |
| Dabhana Limited | Professional & scientific | 2026 |
| Dabhana Tech Limited | Information & communication | 2026 |
| Dabosco Ltd | Real estate | 2020 |
| Dabware Consulting Limited | Information & communication | 2018 |
| Dachsound Limited | Information & communication | 2023 |
| Daci Limited | Construction | 2021 |
| Daffey's Grab Service Ltd | Construction | 2020 |
| Daffodil Housing Ltd | Health & social care | 2015 |
| Dagdas Graphics & Consultancy Ltd | Professional & scientific | 2021 |
| Dagdas Catering Limited | Hospitality | 2026 |
| Daily Ashford Market Ltd | Wholesale & retail | 2025 |
| Daily Medics Ltd | Health & social care | 2020 |
| Daisy Mercedes Ltd | Arts & recreation | 2023 |
| Dakissma Property Sourcing Ltd | Real estate | 2025 |
| Dakota Blue Consulting Ltd | Professional & scientific | 2014 |
| Dale Robinson Carpets Ltd | Wholesale & retail | 2025 |
| Dalewalk Garages Limited | Real estate | 2013 |
| Dalewalk Limited | Real estate | 2002 |
| Dalkeith Laboratories Limited | Manufacturing | 1999 |
| Dalmacia Hotels Limited | Hospitality | 2013 |
| Dalton’S Recovery Ltd | Wholesale & retail | 2019 |
| Daly Accounting Limited | Professional & scientific | 2020 |
| Damoli Limited | Administrative & support | 2017 |
| DAN Electrics Limited | Construction | 2022 |
| Dana Aviation Ltd | Manufacturing | 2016 |
| Danic Drive Ltd | Transport & logistics | 2018 |
| Daniel M Foley Developments Ltd Limited | Construction | 2019 |
| Daniolo Ltd | Hospitality | 2015 |
| Danmark Building Services Limited | Construction | 1998 |
| Danodesign Ltd | Information & communication | 2014 |
| Danowara Ltd | Professional & scientific | 2026 |
| Dansam (Kent) Limited | Real estate | 2011 |
| Danson Ventures Limited | Professional & scientific | 2018 |
| Dantol Resource Limited | Health & social care | 2022 |
| DAR Enterprise Limited | Extraterritorial | 2012 |
| Darborah Holdings Limited | Extraterritorial | 2019 |
| Dari Capital Limited | Information & communication | 2020 |
| Darrell Beaumont Construction Ltd | Construction | 2025 |
| Darren COX Film Transport Ltd | Transport & logistics | 2014 |
| Darren Watkins Brickwork Ltd | Construction | 2017 |
| Darshan Properties Limited | Real estate | 2026 |
| Darwish Consultancy Group Limited | Administrative & support | 2014 |
| Daryl & James Ltd | Information & communication | 2022 |
| Dashfield Plumbing and Heating Ltd | Wholesale & retail | 2021 |
| Dass Hospitality Limited | Hospitality | 2024 |
| Data & Consulting Services Ltd | Information & communication | 2023 |
| Data Compass Ltd | Information & communication | 2025 |
| Data Reprographics Limited | Manufacturing | 1986 |
| Databoreal Ltd | Information & communication | 2024 |
| Datacab Ltd | Information & communication | 2026 |
| Dataprojex International Ltd | Construction | 2009 |
| Dataprojex Ltd | Construction | 2007 |
| Dataset Limited | Administrative & support | 2001 |
| Dath Groundwork’S and Paving Ltd | Construction | 2021 |
| Dathan Holdings Limited | Financial services | 2023 |
| Dathan Properties & Lettings Limited | Real estate | 2024 |
| Datr Technologies Limited | Information & communication | 2024 |
| Datum Carpentry Limited | Construction | 2014 |
| Daumier PVC Ltd | Manufacturing | 2025 |