| D. Milnes Ltd | Manufacturing | 2016 |
| D. Rose Plumbing & Heating Contractors Limited | Construction | 2001 |
| D.A Transport & Haulage Ltd | Transport & logistics | 2025 |
| D.A. Cooper & Sons Limited | Manufacturing | 1996 |
| D.C Solutions Limited | Information & communication | 2013 |
| D.E.S Scaffolding Solutions Ltd | Construction | 2022 |
| D.O.R.Services Limited | Transport & logistics | 2025 |
| D2 NVQ Assessments Ltd | Education | 2025 |
| DA Storage Services Ltd | Transport & logistics | 2016 |
| DA Trading Ltd | Wholesale & retail | 2025 |
| Daani Limited | Health & social care | 2024 |
| Daanyaal Balti House Limited | Hospitality | 2026 |
| DAB 247 Mechanical & Electrical Ltd | Construction | 2020 |
| Dabdrob Ltd | Real estate | 2017 |
| DAC Autocare Ltd | Wholesale & retail | 2025 |
| DAC Autoserv Ltd | Wholesale & retail | 2023 |
| Dace Print Limited | Manufacturing | 2010 |
| Dachvac Ltd | Construction | 2020 |
| Dachvac Properties Ltd | Real estate | 2024 |
| Dads Matter UK | Education | 2015 |
| Daidokoro Ltd | Information & communication | 2019 |
| Daily Essentials 1 Ltd | Wholesale & retail | 2025 |
| Dain Developments Ltd | Real estate | 2016 |
| Daisy Book Keeping Limited | Professional & scientific | 2017 |
| Daisy Delight Ltd | Wholesale & retail | 2025 |
| Daisy Watt Art Limited | Wholesale & retail | 2020 |
| Daisychain Contracts Limited | Hospitality | 2004 |
| Dajo Enterprises Ltd | Wholesale & retail | 2024 |
| Dalby UK Online Limited | Education | 2025 |
| Dald Ltd | Real estate | 2021 |
| Dale Ennis Limited | Wholesale & retail | 2012 |
| Dale Hill Food & Wine Limited | Wholesale & retail | 2019 |
| Dalton Care Contract Limited Partnership | | 2010 |
| DAM Haulage Ltd | Transport & logistics | 2023 |
| Damandjo Ltd | Hospitality | 2026 |
| Damask Holdings Ltd | Professional & scientific | 2019 |
| Damian HGV Ltd | Transport & logistics | 2023 |
| Damp Management Solutions Limited | Construction | 2018 |
| Dampertech Limited | Wholesale & retail | 2003 |
| DAN Air Conditioning (S.Y.) Ltd | Administrative & support | 2007 |
| DAN Archer Carpets Ltd | Wholesale & retail | 2015 |
| DAN Bacon Construction Ltd | Construction | 2025 |
| DAN Edge Coaching Ltd | Other services | 2021 |
| Dan's Cleaning Services Ltd | Administrative & support | 2023 |
| Dan's Motors Ltd | Wholesale & retail | 2020 |
| Danbari Ltd | Wholesale & retail | 2019 |
| Dance Your Way Events Ltd | Arts & recreation | 2026 |
| Dani&Lavi Ltd | Transport & logistics | 2023 |
| Daniel Jones Design Ltd | Professional & scientific | 2024 |
| Daniel Wood Designs Ltd | Other services | 2022 |
| Danieli Davy Distington Limited | Professional & scientific | 2011 |
| Danieli Lynxs Limited | Professional & scientific | 2007 |
| Danieli Lynxs Services Limited | Manufacturing | 1997 |
| Danieli Lynxs Shredder Services Limited | Professional & scientific | 2002 |
| Danieli UK Holding Limited | Professional & scientific | 1994 |
| Danielle Muntyan Design Limited | Arts & recreation | 2021 |
| Danni Bosworth Education Limited | Extraterritorial | 2021 |
| Danni Bosworth Ltd | Arts & recreation | 2020 |
| Danny GAS Ltd | Extraterritorial | 2022 |
| Danny LEE Plumbing and Heating Limited | Construction | 2020 |
| DAR School Limited | Education | 2019 |
| Darby Joinery and Building Ltd | Construction | 2026 |
| Darcom Solutions Limited | Health & social care | 2024 |
| Dare Projects Ltd | Construction | 2025 |
| Dare to BE Social Ltd | Professional & scientific | 2024 |
| Darford Ltd | Construction | 2022 |
| Darjan E-Commerce Ltd | Wholesale & retail | 2021 |
| Darren Edhouse Consulting Limited | Professional & scientific | 2014 |
| Darren Morton (Fire Proofing) Ltd | Construction | 2014 |
| Dart Passive Fire Protection Ltd | Construction | 2022 |
| Darul Madinah Rotherham Limited | Education | 2018 |
| Darwin Investment Holdings Limited | Financial services | 2024 |
| DAS Auto SY Ltd | Wholesale & retail | 2021 |
| DAS Property & Garden Maintenance Ltd | Construction | 2023 |
| Dasdep Ltd | Administrative & support | 2016 |
| Dash Executive Ltd | Transport & logistics | 2026 |
| Daskz Leather Ltd | Wholesale & retail | 2013 |
| Data Driven Intelligence Ltd | Information & communication | 2024 |
| Data Flow Ltd | Administrative & support | 2025 |
| Data Rock Limited | Information & communication | 2011 |
| Datacooling UK Limited | Construction | 2025 |
| Dataking Limited | Information & communication | 2010 |
| Date.Group Ltd | Extraterritorial | 2023 |
| Daunia Architecture Ltd. | Professional & scientific | 2023 |
| Dave Smith Potatoes Limited | Wholesale & retail | 2016 |
| Daver Steels (Bar and Cable Systems) Limited | Manufacturing | 2016 |
| Daves Thai Transport Limited | Transport & logistics | 2025 |
| David Coldwell Boxing Services Limited | Arts & recreation | 2015 |
| David Field Electrical Ltd | Construction | 2019 |
| David Green Food Consultancy Limited | Hospitality | 2013 |
| David Hallam Limited | Construction | 2007 |
| David Hallam Maintenance Limited | Manufacturing | 2014 |
| David James Enterprises Limited | Wholesale & retail | 2004 |
| David Mcnally Ltd. | Information & communication | 2012 |
| David Short Photography Ltd | Professional & scientific | 2000 |
| David Towler Ltd | Professional & scientific | 2011 |
| David Village Lighting Ltd | Wholesale & retail | 1999 |
| David Wake Limited | Construction | 2017 |
| Davies Electrical Solutions Ltd | Construction | 2011 |
| Davrus Technology Limited | Information & communication | 1997 |