| D Marley Roofing & Renovations Limited | Construction | 2024 |
| D P Utilities Limited | Construction | 2015 |
| D Q Surv Ltd | Professional & scientific | 2024 |
| D S W Developments Limited | Construction | 2017 |
| D Willey Brickwork Ltd | Construction | 2026 |
| D&A Hillcrest Developments Ltd | Extraterritorial | 2019 |
| D&B Fire Curtain Specialists Ltd | Construction | 2025 |
| D&C SON Ltd | Transport & logistics | 2016 |
| D&C Trans Limited | Transport & logistics | 2018 |
| D&D Telecom Ltd | Information & communication | 2024 |
| D&E Auto Repair Ltd | Wholesale & retail | 2025 |
| D&G Transport 2020 Limited | Transport & logistics | 2020 |
| D&H Commercial Repairers Ltd | Wholesale & retail | 2011 |
| D&S Projex Ltd | Construction | 2023 |
| D&S UK Holdings Ltd | Wholesale & retail | 2025 |
| D.B.D Driving Ltd | Transport & logistics | 2025 |
| D.W.S. Construction (2005) Limited | Construction | 2005 |
| DA Efficient GAS Services Limited | Construction | 2003 |
| DA Lick Takeaway Ltd | Hospitality | 2023 |
| Da&Ad Trading Ltd | Transport & logistics | 2020 |
| DAD in a Shed Limited | Wholesale & retail | 2016 |
| Dadar Food Ltd | Hospitality | 2021 |
| Dadtyres Ltd | Wholesale & retail | 2017 |
| Daily Ites Beats Ltd | Arts & recreation | 2020 |
| Daisy Maids Ltd | Administrative & support | 2026 |
| Dajon Electrical Limited | Construction | 2003 |
| Dajon Holdings Limited | Real estate | 2026 |
| Dakatu Holdings Ltd | Real estate | 2022 |
| Dalby Brickwork & Construction Limited | Construction | 2019 |
| Dalisha Mini Market Limited | Wholesale & retail | 2024 |
| Damsteel Ltd | Construction | 2022 |
| Danca Transport Ltd | Transport & logistics | 2022 |
| Daniel Haulage Ltd | Transport & logistics | 2025 |
| Daniel Logistica Limited | Administrative & support | 2018 |
| Daniel Razvan Ltd | Transport & logistics | 2019 |
| Daniel Vilcea Ltd | Transport & logistics | 2020 |
| Danjag Ltd | Construction | 2026 |
| Danko Film Ltd | Transport & logistics | 2012 |
| Danny Webb's GP Camp Ltd | Arts & recreation | 2023 |
| Dans Waffle Lounge Limited | Hospitality | 2023 |
| Daogaru Ltd | Transport & logistics | 2019 |
| Dapier Group Ltd | Real estate | 2026 |
| Darbaz Taxi Ltd | Transport & logistics | 2026 |
| Darren Edwards Carpentry Limited | Construction | 2019 |
| Darrens Family Ltd | Wholesale & retail | 2021 |
| Darstan-Trans Ltd | Transport & logistics | 2017 |
| Datageniuses AI Ltd | Information & communication | 2024 |
| Datamex Ltd. | Information & communication | 1991 |
| Datatec I. T. Services Limited | Information & communication | 2011 |
| Daves Trans Ltd | Transport & logistics | 2016 |
| David Clayton Limited | Construction | 2003 |
| David Cutter Music Limited | Information & communication | 2017 |
| David Goswell Limited | Information & communication | 2009 |
| David Hinton Training Limited | Other services | 2019 |
| David Hitchcock Holdings Ltd | Financial services | 2026 |
| Davidson Plumbing Services Limited | Construction | 2015 |
| Davis Aviation Ltd | Manufacturing | 2011 |
| Davis Enterprise Limited | Wholesale & retail | 2016 |
| Davloe Ltd | Health & social care | 2015 |
| Davsem Ltd | Construction | 2021 |
| Dawncare Limited | Health & social care | 2023 |
| Dawnstead Ltd | Real estate | 2025 |
| Dawson CAD Designs Limited | Information & communication | 2005 |
| Daxtonbury Chris Kelly Festivals Limited | Arts & recreation | 2018 |
| Day & Coles (Agricultural) Limited | Wholesale & retail | 1946 |
| Day by Day Care Home Limited | Health & social care | 2017 |
| Daylight Centre Fellowship | Health & social care | 2002 |
| DAZ Lifting Limited | Transport & logistics | 2016 |
| Dazzling Homes Ltd | Hospitality | 2018 |
| DB Stoves & Services Limited | Construction | 2026 |
| DB Website Design Ltd | Information & communication | 2012 |
| DBS Home Solutions Limited | Administrative & support | 2024 |
| DBS K9 Ltd | Administrative & support | 2023 |
| DC Business Limited | Health & social care | 2020 |
| DC Solar Systems Ltd | Construction | 2023 |
| DC Structura Limited | Construction | 2026 |
| DCA 58 Ltd | Hospitality | 2024 |
| DCB Homes Ltd | Real estate | 2018 |
| DCB Products Limited | Wholesale & retail | 2023 |
| DCX Power Solutions Limited | Construction | 2026 |
| DD Beauty Limited | Other services | 2020 |
| DD Fixing Ltd | Construction | 2022 |
| DDS Rents Ltd | Real estate | 2026 |
| DDU Logistics Limited | Transport & logistics | 2023 |
| DE Oliveira Global Services Ltd | Administrative & support | 2019 |
| DE Removals & Haulage Ltd | Water & waste | 2025 |
| De-Sabis Mega Support Ltd | Administrative & support | 2020 |
| Deacon Rope Access Ltd | Administrative & support | 2015 |
| Deagab Ltd | Transport & logistics | 2018 |
| Deal Construction (Northants) Limited | Construction | 2021 |
| Dearden Holdings Limited | Wholesale & retail | 2017 |
| Debayo Properties Limited | Construction | 2020 |
| Debdale Healthcare Ltd | Public administration | 2025 |
| Decadent Design Limited | Other services | 2009 |
| Decoy Farm Power Limited | Energy | 2014 |
| Deda Expert Ltd | Transport & logistics | 2022 |
| Dedem Ltd | Hospitality | 2024 |
| Deedra Company Ltd | Health & social care | 2021 |
| Deep Groundworks Contracting Ltd | Construction | 2025 |
| Deeyo Ltd | Wholesale & retail | 2022 |