| Daniels & Daniels Limited | Real estate | 2003 |
| Danisell Ltd | Wholesale & retail | 2022 |
| Danish Medical Services Limited | Health & social care | 2023 |
| Danmoxy Ltd | Information & communication | 2026 |
| Dann Environmental Services Limited | Other services | 2008 |
| Dann Screening & Crushing Limited | Other services | 2011 |
| Danny & Co Cleaning Service Limited | Administrative & support | 2020 |
| Danny Matts Holdings Ltd | Financial services | 2023 |
| Danny Spillane Golf Retail Limited | Arts & recreation | 2003 |
| Danny Trading Ltd | Manufacturing | 2021 |
| Dannystore Ltd | Wholesale & retail | 2021 |
| Danrit Ltd | Administrative & support | 2025 |
| Dans Foods Ltd | Hospitality | 2020 |
| Dant Employee Solutions Ltd | Construction | 2024 |
| Dant Employment Ltd | Professional & scientific | 2024 |
| Danvit Trans Ltd | Transport & logistics | 2021 |
| Dany Logystics Limited | Transport & logistics | 2017 |
| Danyal Shisha Ltd | Hospitality | 2021 |
| Danyalafzal Ltd | Information & communication | 2022 |
| Dan’S Car Detailing Limited | Wholesale & retail | 2026 |
| DAO Care Group Limited | Health & social care | 2026 |
| Dapperessentials Limited | Wholesale & retail | 2024 |
| DAR Studio Eleven Ltd | Construction | 2025 |
| Dara Direct Ltd | Wholesale & retail | 2022 |
| Dara Thai Spa Ltd | Other services | 2021 |
| Daraf Services Ltd | Construction | 2019 |
| Daraja Innovation Limited | Extraterritorial | 2018 |
| Darbaars Pharmacy Limited | Health & social care | 2008 |
| Darbar Arts Culture and Heritage Trust | Arts & recreation | 2007 |
| Darboe Jula Building & Maintenance Services Ltd | Construction | 2024 |
| Darcoop Foods Limited | Hospitality | 2025 |
| Dard Properties Limited | Construction | 2021 |
| Dardara Services Ltd | Transport & logistics | 2023 |
| Dardona Ltd | Transport & logistics | 2020 |
| Dare to (UK) Ltd | Other services | 2025 |
| Darfour Projet Communitaire C.I.C. | Education | 2024 |
| Dariyai Products Limited | Manufacturing | 2015 |
| Dark Knight Group Ltd | Transport & logistics | 2025 |
| Darko and Mash Limited | Arts & recreation | 2021 |
| Darler Digital Limited | Information & communication | 2021 |
| Darley Park Properties Limited | Real estate | 1976 |
| Darmight Projects Limited | Construction | 1980 |
| Darnisan Logistic Limited | Transport & logistics | 2012 |
| DARONTA97A Limited | Hospitality | 2026 |
| Darora Limited | Education | 2025 |
| Darran.Studio Limited | Professional & scientific | 2025 |
| Darren Designs Limited | Professional & scientific | 2023 |
| Darren Jarvis Ltd | Professional & scientific | 2008 |
| Darren LEE Construction Limited | Construction | 2005 |
| Darren Wyeth Limited | Construction | 2002 |
| Darsat Limited | Education | 2016 |
| Dartford Real Estates Limited | Construction | 2023 |
| Dartmouth Auto Castings Limited | Professional & scientific | 1933 |
| Dartmouth High Ltd | Wholesale & retail | 2025 |
| Dartsign Limited | Manufacturing | 1986 |
| Darul Ihsaan Ltd | Education | 2018 |
| Darul Madinah Leicester Ltd | Education | 2021 |
| Daryzone Ltd | Transport & logistics | 2019 |
| DAS Brothers Properties Ltd | Real estate | 2025 |
| DAS Homes Limited | Real estate | 2020 |
| DAS Oncocare Limited | Health & social care | 2014 |
| DAS Pension Administration Limited | Professional & scientific | 2021 |
| Dasa Limited | Real estate | 2025 |
| Dasgupta Medical Ltd | Health & social care | 2023 |
| Dash Print & Embroidery Ltd | Manufacturing | 2026 |
| Dassu Optics Ltd | Health & social care | 2023 |
| DAT Safe Plumbing & GAS Limited | Construction | 2025 |
| Data & Voice Cabling Ltd | Information & communication | 2002 |
| Data Alloy Limited | Information & communication | 2005 |
| Data CEN Solutions Ltd | Construction | 2025 |
| Data Demon Systems Limited | Information & communication | 2024 |
| Data Image Group Ltd | Manufacturing | 1998 |
| Data Image Systems Limited | Extraterritorial | 1998 |
| Data Leap Ltd | Professional & scientific | 2022 |
| Data Visualisation Solutions UK Ltd | Transport & logistics | 2024 |
| Datadrive Limited | Information & communication | 2025 |
| Dataframe Consultancy Limited | Information & communication | 2022 |
| Datahorizon Labs Limited | Information & communication | 2025 |
| Datahub Consulting Ltd | Information & communication | 2018 |
| Datalink Electronics Limited | Manufacturing | 1982 |
| Datamail Midlands Limited | Professional & scientific | 2016 |
| Datamail Resolves Limited | Financial services | 2024 |
| Datariskx Limited | Information & communication | 2025 |
| Datavaro Limited | Information & communication | 2017 |
| Datax Ltd | Wholesale & retail | 2026 |
| Dataxyz Ltd | Information & communication | 2020 |
| Datchet Pioneer Ltd | Administrative & support | 2014 |
| Datchworth Transport Ltd | Transport & logistics | 2014 |
| Date-Tag Ltd | Wholesale & retail | 2024 |
| Datia Ltd | Information & communication | 2022 |
| Datics Analytics Ltd | Information & communication | 2017 |
| Datsons Accountancy Services Limited | Professional & scientific | 2013 |
| Datsons Investments Limited | Real estate | 2021 |
| Dattani Brothers Limited | Real estate | 2023 |
| Dattani Invest Ltd | Real estate | 2020 |
| Datum Adventure Travel Limited | Education | 2025 |
| DAV Properties (Leic) Limited | Real estate | 2015 |
| Dava Property Co Ltd | Hospitality | 2026 |
| Davaar Ltd | Real estate | 2003 |
| Davda Ltd | Real estate | 2016 |