| DCH Brickwork Ltd | Construction | 2021 |
| Dci-Fp Ltd | Financial services | 2023 |
| DCS Benefits Ltd | Professional & scientific | 2023 |
| DCU Plumbing Services Ltd | Construction | 2024 |
| DCV Engineering Limited | Administrative & support | 2004 |
| Dcvl Ltd | Extraterritorial | 2023 |
| DD Contractors Limited | Construction | 2014 |
| DD RENEW1 Limited | Real estate | 2023 |
| DD Supplyz Services Ltd | Transport & logistics | 2020 |
| Dddco Ltd | Health & social care | 2022 |
| DDK Dental Ltd | Health & social care | 2026 |
| DDM Interiors Limited | Construction | 2025 |
| DDM Limited | Information & communication | 2018 |
| DDN Groundworks Ltd | Extraterritorial | 2023 |
| DDN Plantworks Ltd | Extraterritorial | 2023 |
| Ddrenew Limited | Construction | 2023 |
| DDS IT Services Ltd | Information & communication | 2024 |
| DE Costa Limited | Construction | 2008 |
| DE Eiscreme Projekt Ltd | Manufacturing | 2024 |
| DE Fazio Holdings Limited | Financial services | 2024 |
| DE Heer Capital Partners Ltd | Professional & scientific | 2025 |
| DE Jongh Digital Consulting Ltd | Information & communication | 2026 |
| DE Jongh Digital Holdings Limited | Financial services | 2026 |
| DE Lange Consultancy Ltd | Professional & scientific | 2011 |
| DE Millies Ltd | Wholesale & retail | 2010 |
| DE Mior Ltd | Wholesale & retail | 2023 |
| DE Plates Ltd | Hospitality | 2026 |
| DE Queiros Consultancy Limited | Other services | 2017 |
| DE Run LI Ltd. | Wholesale & retail | 2025 |
| DE Victors Ltd | Professional & scientific | 2015 |
| De-Lighthouse Limited | Real estate | 2020 |
| De-Willis Consult Ltd. | Administrative & support | 2013 |
| Dead Poets Live Limited | Arts & recreation | 2017 |
| Deae Limited | Health & social care | 2022 |
| Deal Electrical Contracting Limited | Construction | 2017 |
| Dealcairn Limited | Wholesale & retail | 2000 |
| Dealer Gate Ltd | Information & communication | 2025 |
| Dealer Services UK Limited | Wholesale & retail | 2005 |
| Dealerz Limited | Wholesale & retail | 2018 |
| Deals in Wheels Limited | Wholesale & retail | 2014 |
| Deals on Motors Ltd | Wholesale & retail | 2025 |
| Deals on Wheels MK Ltd | Wholesale & retail | 2025 |
| DEALS4EVER Limited | Wholesale & retail | 2013 |
| Deanshanger Dog Walking Field Ltd | Other services | 2020 |
| Deanshanger Playing Fields Association Limited | Arts & recreation | 2015 |
| Deanshanger Sports Club Limited | Hospitality | 2016 |
| Deanshanger Vehicle Services Ltd | Wholesale & retail | 2019 |
| Debbie's Curtains and Blinds Ltd | Manufacturing | 2026 |
| Debello Law Limited | Professional & scientific | 2010 |
| Debma Luxury Homes Limited | Hospitality | 2022 |
| Debora Tentis Ltd | Wholesale & retail | 2023 |
| Deborah Bowser Management Limited | Financial services | 2015 |
| Debouge Tech Ltd | Information & communication | 2018 |
| Debs & D Properties Ltd | Real estate | 2025 |
| Debs Consultancy Ltd | Professional & scientific | 2018 |
| Debt Recoveries Limited | Administrative & support | 2014 |
| December Systems Limited | Information & communication | 2007 |
| Decent Thread Ltd | Wholesale & retail | 2026 |
| Decimal Consulting Limited | Information & communication | 2017 |
| Decimal Solutions Limited | Professional & scientific | 2013 |
| Decisive Accounting Ltd | Professional & scientific | 2023 |
| Decisive Partners Ltd | Professional & scientific | 2015 |
| Decomancer UK Limited | Manufacturing | 2023 |
| Decorator Accountants Limited | Professional & scientific | 2017 |
| Decorus Care Group Ltd. | Health & social care | 2019 |
| Decorus Furniture Group Limited | Wholesale & retail | 2018 |
| DED Repair Ltd | Wholesale & retail | 2017 |
| DEE and DJ Consulting Ltd | Professional & scientific | 2015 |
| DEE Livin Ltd | Construction | 2021 |
| DEE Property Management Limited | Administrative & support | 2018 |
| DEE Property Solutions Limited | Professional & scientific | 2018 |
| DEE TEE Properties Ltd | Real estate | 2024 |
| Dee&G Limited | Administrative & support | 2025 |
| Deedee Recruitment Ltd | Transport & logistics | 2025 |
| Deeley Fabrications MK Limited | Manufacturing | 2012 |
| Deema Support Services Limited | Health & social care | 2015 |
| Deep and Steam Cleaning Services Limited | Administrative & support | 2025 |
| Deep Blue Day Limited | Financial services | 2014 |
| Deep Body Health Ltd | Arts & recreation | 2016 |
| Deep Consultants Limited | Professional & scientific | 2009 |
| Deep Sky Media Ltd | Information & communication | 2011 |
| Deepam Language Services Limited | Professional & scientific | 2021 |
| Deepsolve Consulting Ltd | Information & communication | 2024 |
| Deepthink AI Services Ltd | Information & communication | 2025 |
| Deeta Ltd | Construction | 2022 |
| Deevine Clinical Services Limited | Health & social care | 2012 |
| Defaith Care Ltd | Health & social care | 2021 |
| Defender.One Ltd | Information & communication | 2025 |
| Defensityone Limited | Administrative & support | 2013 |
| Define Brows Limited | Other services | 2020 |
| Deft Business Solutions Limited | Information & communication | 2010 |
| Deft Tailoring Limited | Wholesale & retail | 2009 |
| DEJ & Co Services Limited | Administrative & support | 2026 |
| Dejco Limited | Transport & logistics | 2023 |
| Dejfrim Limited | Health & social care | 2021 |
| Dekh Dekh Limited | Information & communication | 2012 |
| Dekko Projects Ltd | Information & communication | 2006 |
| Delade Group Limited | Hospitality | 2025 |
| Delaney Hydraulic Concrete Skips Ltd | Professional & scientific | 2025 |
| Delanosmith Limited | Health & social care | 2012 |