| Dalhan Ltd | Financial services | 2025 |
| Dalreagh Private Nursing Home Limited | Health & social care | 1971 |
| Dalvie Storage Systems Limited | Construction | 2000 |
| Daman Transport Ltd | Transport & logistics | 2015 |
| Dambela &SON Motors Limited | Wholesale & retail | 2017 |
| Damdia Limited | Wholesale & retail | 2008 |
| Dameon Keith Ford Ltd | Real estate | 2024 |
| Damis Construct Ltd | Construction | 2021 |
| Dampol Trans Ltd | Transport & logistics | 2025 |
| DAN Bird Property & Electrical Services Ltd | Construction | 2026 |
| DAN Bull Limited | Information & communication | 2013 |
| DAN Engineering Limited | Construction | 2013 |
| DAN Houldsworth Consulting Ltd | Information & communication | 2007 |
| DAN Watts Construction Limited | Other services | 2017 |
| Danceforce Ltd | Arts & recreation | 2020 |
| Danduwall Properties Limited | Real estate | 2023 |
| Danescourt Manor (Management Company) Limited | Real estate | 2016 |
| Dangerous Sheep Events Ltd | Hospitality | 2019 |
| Dani's Food Ltd | Wholesale & retail | 2022 |
| Danicon Limited | Construction | 2024 |
| Daniel 2024 Limited | Transport & logistics | 2025 |
| Daniel James Property Group Limited | Construction | 2018 |
| Daniel Mcclane Ltd | Professional & scientific | 2018 |
| Daniel Smith Carpentry Ltd | Manufacturing | 2021 |
| Daniela Nails , Hair & Beauty Ltd | Other services | 2023 |
| Danik Insulations Ltd | Construction | 2024 |
| Danints Ltd | Information & communication | 2025 |
| Dani’S Barber and Grooming Ltd | Other services | 2026 |
| Danni Global Limited | Wholesale & retail | 2024 |
| Danny Driu Transport Ltd | Transport & logistics | 2018 |
| Danny's Barber Codsall Ltd | Other services | 2023 |
| Danny's Butchers Ltd | Wholesale & retail | 2014 |
| Dansclearouts Ltd | Transport & logistics | 2025 |
| Dantium Technologies Limited | Construction | 2015 |
| DAO Xiang Limited | Hospitality | 2026 |
| Dapper DAN Formal Suit Hire for MEN and Boys Limited | Administrative & support | 2001 |
| Dapper Dogs Limited | Agriculture & fishing | 2007 |
| DAR AL Rawda Estates Ltd | Real estate | 2026 |
| Darbat Limited | Construction | 2026 |
| Darbys of Ironbridge Limited | Hospitality | 2009 |
| DARE2DREAM Network CIC | Information & communication | 2025 |
| Daresbury Construction Ltd | Construction | 2023 |
| Daresbury Property Group Ltd | Real estate | 2019 |
| Darius Transport Solutions Ltd | Transport & logistics | 2025 |
| Darkside Floyd Show Limited | Arts & recreation | 2015 |
| Darlaston ALL in One Express Ltd | Wholesale & retail | 2021 |
| Darlaston Drink Shop Limited | Wholesale & retail | 2019 |
| Darlaston Local Ltd | Wholesale & retail | 2022 |
| Darlington ST COM Limited | Real estate | 2025 |
| Darlington ST RES Limited | Real estate | 2025 |
| Darlo Auto Repairs Ltd | Wholesale & retail | 2025 |
| Daro Engineering (Stafford) Limited | Manufacturing | 1990 |
| Darren Smith Carpentry Ltd | Construction | 2017 |
| Darshan & Amar Investments Limited | Real estate | 2013 |
| Darshan Investments Ltd | Real estate | 2023 |
| Dartmouth Lyons Limited | Hospitality | 2018 |
| Darts Direct Ltd | Wholesale & retail | 2025 |
| Darvill Engineering Company Limited | Manufacturing | 1965 |
| Darwioll Ltd | Transport & logistics | 2017 |
| DAS Properties and Investments Ltd | Real estate | 2025 |
| Dascare Home Ltd | Health & social care | 2022 |
| Dasedave UK Limited | Health & social care | 2012 |
| Dasem Ltd | Administrative & support | 2025 |
| Dashmesh Investments Ltd | Real estate | 2025 |
| Dasiq Ltd | Wholesale & retail | 2026 |
| Dass Brother's Limited | Wholesale & retail | 2025 |
| DAT Control Ltd | Manufacturing | 2018 |
| Data M (UK) Sheet Metal Solutions Ltd | Professional & scientific | 2009 |
| Data Palette Limited | Information & communication | 2022 |
| Data-Experts Limited | Manufacturing | 1993 |
| Database Sage IT Services Limited | Information & communication | 2026 |
| Datahub Limited | Information & communication | 1978 |
| Dataops IT Ltd | Information & communication | 2011 |
| Datla Logistics Ltd | Transport & logistics | 2026 |
| Dato 247 Limited | Health & social care | 2024 |
| Daugriff Limited | Construction | 2018 |
| Davboadu Plastic Limited | Manufacturing | 2014 |
| Davda Global Services Limited | Information & communication | 2025 |
| Dave Heffernan Ltd | Professional & scientific | 2018 |
| Dave Pugh Consulting Ltd | Information & communication | 2019 |
| Davgun Properties Ltd | Real estate | 2023 |
| David Alexandru Ltd | Transport & logistics | 2015 |
| David Austin Holdings Ltd | Financial services | 2024 |
| David Austin Investments Ltd | Financial services | 2024 |
| David Austin Roses (Holdings) Limited | Financial services | 2018 |
| David Austin Roses Limited | Wholesale & retail | 1992 |
| David Banks Carpentry Ltd | Construction | 2021 |
| David Cheadle Limited | Wholesale & retail | 1994 |
| David Corfield Limited | Arts & recreation | 2014 |
| David Peters Digital Limited | Professional & scientific | 2000 |
| Davide Brand Italy Ltd | Wholesale & retail | 2025 |
| Davido Motors Limited | Wholesale & retail | 2024 |
| Davies Barrett Developments Limited | Construction | 2007 |
| Davies Development Partnership Ltd | Real estate | 2021 |
| Davina Perrin Ltd | Arts & recreation | 2025 |
| Davis & Deeley Limited | Construction | 2002 |
| Davnik Trans Ltd | Transport & logistics | 2020 |
| Davvoz Limited | Health & social care | 2025 |
| Dav’S Property Solutions Ltd | Households | 2025 |
| DAW White Murrall Limited | Professional & scientific | 2026 |