| D Turner Builders Ltd | Construction | 2002 |
| D&A Architectural and Structural Designs Ltd | Professional & scientific | 2014 |
| D&A Engineering Ltd | Professional & scientific | 2008 |
| D&H Brothers Ltd | Wholesale & retail | 2012 |
| D&M Mould Specialists Limited | Manufacturing | 2005 |
| D.C. Estates Limited | Wholesale & retail | 1984 |
| D.M.S. Systems Limited | Manufacturing | 1988 |
| D5ICP Ltd | Information & communication | 2023 |
| Daima Limited | Information & communication | 2023 |
| Daisy Chain Care Team Ltd | Public administration | 2017 |
| Daisy Moon Coffee Co Ltd | Hospitality | 2026 |
| Dalcom Services Limited | Information & communication | 2018 |
| Daliani Boutique Limited | Wholesale & retail | 2021 |
| Dalilah Limited | Information & communication | 2021 |
| Dallington Energy Ltd | Professional & scientific | 2022 |
| Dalmech Engineering Limited | Manufacturing | 2011 |
| Damask Green Limited | Real estate | 2011 |
| DAN Collier AV Services Limited | Construction | 2020 |
| Dando Contracting International Ltd | Manufacturing | 2021 |
| Danescroft Consultants Limited | Administrative & support | 2017 |
| Danfood Slicing Limited | Wholesale & retail | 2024 |
| Danfood Technology Limited | Wholesale & retail | 1992 |
| Daniel Green Residential Ltd | Real estate | 2026 |
| Daniel Hastings Limited | Hospitality | 2014 |
| Daniel Hutchinson Limited | Administrative & support | 2008 |
| Daniel Mcauliffe Limited | Construction | 2025 |
| Danielle Galvan (Properties) Ltd | Real estate | 2009 |
| Daniels Domestic Appliance Repairs Ltd | Manufacturing | 2022 |
| Danny Bailey Property Ltd | Real estate | 2023 |
| Danny Diamonds Ltd | Wholesale & retail | 2020 |
| Dante Electrical Limited | Construction | 2005 |
| Dante Property Ltd. | Real estate | 2020 |
| Dantzig & Parker Ventures Ltd | Real estate | 2024 |
| Darby Property Portfolio Limited | Real estate | 2019 |
| Dare Design Studio Ltd | Professional & scientific | 2025 |
| Darkest Star Limited | Professional & scientific | 2007 |
| Darkfire Risk Management Ltd | Financial services | 2025 |
| Darkside Customs Limited | Professional & scientific | 2024 |
| Darren Niles Limited | Information & communication | 2007 |
| Dart Accountancy Ltd. | Professional & scientific | 1997 |
| Darwin Consult Ltd | Professional & scientific | 2020 |
| Datafenix Ltd | Information & communication | 2024 |
| Daughter 3 Limited | Other services | 2024 |
| Dav-It Property Management Ltd | Real estate | 2024 |
| David Barnes Consulting Ltd | Administrative & support | 2010 |
| David Carter Consulting Limited | Information & communication | 2017 |
| David Hillier Consulting Ltd | Information & communication | 2025 |
| David T. Chellew Limited | Real estate | 1964 |
| Davies Beech Property Services Ltd | Professional & scientific | 2014 |
| Davkan Solutions Limited | Extraterritorial | 1999 |
| Dawn.N.Peters Consulting Limited | Administrative & support | 2025 |
| Day 2 Day Bookkeeping Ltd | Professional & scientific | 2022 |
| Day Surgery UK Group Ltd | Financial services | 2026 |
| DBC Industrial Ltd | Manufacturing | 2024 |
| Dcdrops Ltd | Wholesale & retail | 2025 |
| DCL Plumbing and Heating Limited | Construction | 2021 |
| Dcto Consulting Limited | Professional & scientific | 2017 |
| DDS Water Solutions Ltd | Construction | 2016 |
| Dead Good Media Ltd | Manufacturing | 2012 |
| Deans Aerial Photography Ltd | Professional & scientific | 2022 |
| Dears Vehicle Recovery & Transport Limited | Transport & logistics | 2021 |
| Deberiat Ltd | Information & communication | 2011 |
| DEC Marketing Company Limited | Administrative & support | 2007 |
| Decentra Limited | Other services | 2012 |
| Decmar Limited | Information & communication | 1982 |
| Deconcidal Ltd | Professional & scientific | 2011 |
| Deekroo Ventures Ltd | Real estate | 2021 |
| Dekoh Limited | Construction | 2020 |
| DEL Puerto Limited | Health & social care | 2018 |
| Delany Stag Ltd | Professional & scientific | 2013 |
| Delecta Fruit Limited | Wholesale & retail | 2008 |
| Delia Lunnon Limited | Professional & scientific | 2013 |
| Deltic Ltd | Professional & scientific | 2025 |
| Demaine Land (Clifton) Ltd | Construction | 2025 |
| Demaine Land (Herts) Ltd | Construction | 2021 |
| Demontfort Elements Limited | Energy | 2008 |
| Dempsey Ductwork Limited | Construction | 2015 |
| Demystify Professional Services Ltd | Information & communication | 2018 |
| Denizen Partners Ltd | Administrative & support | 2023 |
| Denmead Investments Limited | Construction | 1963 |
| Deonhart Limited | Agriculture & fishing | 1975 |
| Derek Allen (Farming) Limited | Agriculture & fishing | 1977 |
| Derivatives People Limited | Professional & scientific | 2000 |
| Dermadae Ltd | Wholesale & retail | 2026 |
| Descarte/Base Limited | Other services | 1999 |
| Design 2001 Limited | Manufacturing | 1989 |
| Designedbydavid Limited | Professional & scientific | 2007 |
| Designent Limited | Wholesale & retail | 2020 |
| Deux Rois 614 Ltd | Wholesale & retail | 2020 |
| Developing Building Services Ltd | Construction | 2011 |
| Developmore Ltd | Real estate | 2016 |
| Devit & SON Limited | Real estate | 2019 |
| Devit & Sons 2 Ltd | Real estate | 2026 |
| Dewdrop Health and Wellbeing Limited | Health & social care | 2019 |
| DG Surveying Limited | Professional & scientific | 2017 |
| DG Wines Ltd | Wholesale & retail | 2023 |
| DGP Actuarial Ltd | Financial services | 2023 |
| Dgqc Music Ltd | Information & communication | 2025 |
| Dhaka Curry Ltd | Hospitality | 2022 |
| Diazo Architects Ltd | Professional & scientific | 2016 |