| D O'Brien Electrical Limited | Manufacturing | 2008 |
| D Oxley Plastering Services Ltd | Construction | 2017 |
| D P Saxton Installations Ltd | Professional & scientific | 2025 |
| D P Services Machine Removals Limited | Transport & logistics | 2004 |
| D Parkin Accounting Ltd | Professional & scientific | 2025 |
| D Pashley Holdings Limited | Financial services | 2025 |
| D Pashley Limited | Manufacturing | 2017 |
| D Performance Limited | Transport & logistics | 2017 |
| D Printing Services Limited | Manufacturing | 2012 |
| D R M Associates Limited | Administrative & support | 1993 |
| D S Coachworks Ltd | Wholesale & retail | 2020 |
| D S Financial Limited | Financial services | 2004 |
| D S Singh Ltd | Health & social care | 2011 |
| D S Taekwondo Ltd | Other services | 2018 |
| D Sinc Limited | Professional & scientific | 2018 |
| D Smith & Daughters Limited | Hospitality | 2025 |
| D T L Limited | Extraterritorial | 1997 |
| D T Wiring Ltd | Construction | 2019 |
| D Thompson Consultancy Ltd | Information & communication | 2018 |
| D Whitehead Electrical Ltd | Construction | 2024 |
| D Whitehead Properties Ltd | Real estate | 2024 |
| D Z Food Store Limited | Hospitality | 2024 |
| D&A Auto Centre Ltd | Wholesale & retail | 2023 |
| D&A Services International Ltd | Professional & scientific | 2023 |
| D&A Trade Ltd | Wholesale & retail | 2024 |
| D&C Global Foods Ltd Ltd | Hospitality | 2026 |
| D&D Carriage Ltd | Transport & logistics | 2023 |
| D&D Engineering Solutions Ltd | Professional & scientific | 2014 |
| D&D Hospitality Solutions Ltd | Hospitality | 2024 |
| D&D Kitchens & Bedrooms Ltd | Construction | 2004 |
| D&Dc Properties Limited | Real estate | 2026 |
| D&J Drink and Dine Ltd | Hospitality | 2025 |
| D&J Property Developments Limited | Construction | 2013 |
| D&O Ward Ltd | Information & communication | 2017 |
| D&P Land Owners Limited | Real estate | 2020 |
| D&P's Hospitality Limited | Other services | 2024 |
| D&R Enterprises Limited | Extraterritorial | 2019 |
| D&R Express Transport Ltd | Transport & logistics | 2023 |
| D&S Property Group Limited | Real estate | 2023 |
| D&T Network Limited | Health & social care | 2025 |
| D&X Food Hub Ltd | Hospitality | 2023 |
| D&X Properties Investment Ltd | Real estate | 2024 |
| D&X Properties Ltd | Financial services | 2017 |
| D&X Properties Management Limited | Real estate | 2018 |
| D&X Property Investment Limited | Real estate | 2021 |
| D&X Property Ltd | Construction | 2017 |
| D&X Property Service Ltd | Financial services | 2021 |
| D&X Universal Ltd | Real estate | 2020 |
| D'Ahni's Ltd | Wholesale & retail | 2025 |
| D'Azur Law Limited | Professional & scientific | 2023 |
| D'Cent Limited | Wholesale & retail | 2013 |
| D'Cruz Freelance Limited | Information & communication | 2024 |
| D'Elegance Travel Limited | Information & communication | 1992 |
| D'Sauce Ltd | Manufacturing | 2026 |
| D-Domain Ltd | Professional & scientific | 2023 |
| D-Line Hospitality Limited | Hospitality | 2022 |
| D-Map Properties Ltd | Real estate | 2023 |
| D. Essex Freight (Forwarding) Limited | Transport & logistics | 1978 |
| D. Keighley Project Management Limited | Professional & scientific | 2017 |
| D. L. Crighton (Engineering Commodities) Limited | Transport & logistics | 1988 |
| D. Sanderson Electrical Services Limited | Construction | 2012 |
| D.A.C.Steels Limited | Wholesale & retail | 1987 |
| D.A.R Properties Limited | Real estate | 2018 |
| D.C. Glover Limited | Arts & recreation | 2013 |
| D.E.S. Systems Limited | Construction | 2022 |
| D.Essex Freight (Sheffield) Limited | Transport & logistics | 1981 |
| D.G Decorators (Yorkshire) Limited | Construction | 2012 |
| D.H Electrical Engineering Services Ltd | Energy | 2015 |
| D.Hammond Engineering Services Ltd | Construction | 2022 |
| D.I.L. Engineering Services Limited | Professional & scientific | 2011 |
| D.J. Mackay & Co. Limited | Professional & scientific | 1992 |
| D.L. Storage Handling Limited | Construction | 1975 |
| D.M.& S. Consultants Limited | Professional & scientific | 2007 |
| D.M.T Fire & Security Ltd | Administrative & support | 2024 |
| D.P. Doors and Shutters Limited | Manufacturing | 1997 |
| D.P. Electrical Solutions Limited | Construction | 2011 |
| D.R. Transportation Services Ltd | Transport & logistics | 2025 |
| D.R.B Consultancy Ltd | Financial services | 2020 |
| D.Roe Enterprises Limited | Wholesale & retail | 2025 |
| D.S.I. Data Systems International Limited | Information & communication | 1978 |
| D.V. Ellis Limited | Construction | 1993 |
| D2 Cleaning Services Ltd | Administrative & support | 2024 |
| D2 Industrial Ltd | Extraterritorial | 2009 |
| D2 Property Group Limited | Real estate | 2024 |
| D2D Cycling Ltd | Wholesale & retail | 2015 |
| D2E Services Limited | Wholesale & retail | 2015 |
| D50 (Holdings) Limited | Professional & scientific | 2025 |
| DA Pluk Limited | Hospitality | 2020 |
| DA Vinci's Pizza Ltd | Hospitality | 2026 |
| DAA Comms Ltd | Information & communication | 2023 |
| Daa'D Engineering Services Ltd | Construction | 2020 |
| Daakshi Limited | Wholesale & retail | 2025 |
| Daalicious Ltd | Hospitality | 2025 |
| Daalmas Limited | Professional & scientific | 2007 |
| Daax Property Ltd | Real estate | 2023 |
| Dabar Fire Prevention Limited | Public administration | 2000 |
| Dacsource Limited | Professional & scientific | 2025 |
| Daddy's Bread Ltd | Wholesale & retail | 2019 |
| Daemonic Limited | Information & communication | 2026 |
| DAF Building & Joinery Limited | Construction | 2022 |