| Dei-Han Limited | Agriculture & fishing | 1998 |
| Delhi BOY Ltd | Extraterritorial | 2009 |
| Deli Bacon Ltd | Wholesale & retail | 2002 |
| Delight Care, Support and Cleaning Services Limited | Health & social care | 2018 |
| DELIVERY24 Limited | Transport & logistics | 2019 |
| DEMA87 Ltd | Administrative & support | 2023 |
| Denington Properties Limited | Real estate | 2017 |
| Denis G Multitrade Limited | Other services | 2016 |
| Deniz Food Ltd | Hospitality | 2019 |
| Deniz Pizza Kebab Ltd | Hospitality | 2025 |
| Denning Refrigeration Limited | Manufacturing | 2009 |
| Dentition Art Limited | Health & social care | 2021 |
| Dentorama Ltd | Health & social care | 2023 |
| Denu Properties Ltd | Real estate | 2024 |
| Depam Ltd | Wholesale & retail | 2020 |
| Departure Gate Studios Ltd | Information & communication | 2026 |
| DER1 Fire & Security Ltd | Administrative & support | 2021 |
| Dercaci LUX Limited | Wholesale & retail | 2025 |
| Derngate Video Photography Ltd | Information & communication | 2010 |
| Derrick Ames Limited | Transport & logistics | 2017 |
| Descod Ltd | Information & communication | 2016 |
| Desfol Ltd | Professional & scientific | 2012 |
| Desi Street Kitchen Limited | Hospitality | 2025 |
| Design Brief Ltd | Information & communication | 2018 |
| Designed 2 Live Limited | Health & social care | 2014 |
| Desk Gear Limited | Wholesale & retail | 2011 |
| Desunkalt Interbiz Services Ltd | Professional & scientific | 2024 |
| Devan U.K. Limited | Real estate | 1999 |
| Devonshire Central Ltd | Wholesale & retail | 2025 |
| Dewarelectrical Ltd | Construction | 2023 |
| DEX1 Limited | Hospitality | 2021 |
| Dexters of Oundle Limited | Hospitality | 2015 |
| DG Accountants Limited | Professional & scientific | 2005 |
| DG Office Space Ltd | Real estate | 2015 |
| DG Trans Services Ltd | Transport & logistics | 2015 |
| Dgenus Ltd | Construction | 2025 |
| Dgks Solutions Limited | Information & communication | 2007 |
| DGR Solutions Ltd | Wholesale & retail | 2025 |
| DH Watchmodule Ltd | Wholesale & retail | 2026 |
| Dhaka Enterprise Limited | Hospitality | 2020 |
| Dharma Investments Ltd | Real estate | 2011 |
| DHD Estates Limited | Real estate | 2021 |
| DHD ESTATES(6-10) Limited | Real estate | 2024 |
| Dhwatchmods Ltd | Wholesale & retail | 2025 |
| Diagen Ltd | Transport & logistics | 2024 |
| Diamond Cleaning 1000 Ltd | Administrative & support | 2020 |
| Diamond Conservatories, Windows and Doors (Kettering) Ltd | Construction | 2010 |
| Diamond Jobs (Recruitment) Ltd | Administrative & support | 2025 |
| Diamond Lounge Ltd | Hospitality | 2024 |
| Diamond Spraying Limited | Wholesale & retail | 2007 |
| Dibm Properties Ltd | Real estate | 2024 |
| Diesel Care Services Ltd | Wholesale & retail | 2007 |
| Diesel Security K9 Ltd | Administrative & support | 2026 |
| Digfad Ltd | Other services | 2017 |
| Digital IT Solutions Ltd | Information & communication | 2010 |
| Digital Network Services Limited | Professional & scientific | 2025 |
| Digivide Limited | Information & communication | 2026 |
| Diligent IT Services Limited | Information & communication | 2024 |
| Diln Properties Ltd | Real estate | 2022 |
| Diln Systems Ltd | Information & communication | 2026 |
| Direct Driver Solutions UK Ltd | Transport & logistics | 2007 |
| Direct Local Ltd | Transport & logistics | 2022 |
| Direct Local Removals Ltd | Transport & logistics | 2024 |
| Directional Drilling Services (UK) Limited | Construction | 1994 |
| Distributed Sound & Video Limited | Wholesale & retail | 2006 |
| Divamm Ltd | Manufacturing | 2025 |
| Dive Right in Limited | Education | 2025 |
| Diverse Business Network Ltd | Administrative & support | 2022 |
| Divrich Limited | Public administration | 2026 |
| Divulgence Limited | Information & communication | 2011 |
| Diwan Supermarket Ltd | Wholesale & retail | 2024 |
| DIY Fasteners Shop Ltd | Wholesale & retail | 2023 |
| Djmqs Limited | Financial services | 2011 |
| DJP Brickworks Limited | Construction | 2013 |
| DK & Company Services Limited | Professional & scientific | 2006 |
| DK Bookkeepers Ltd | Professional & scientific | 2022 |
| DK Consultancy 1 Ltd | Professional & scientific | 2025 |
| DK Lettings (Northants) Ltd | Real estate | 2025 |
| DK Meat Ltd | Wholesale & retail | 2025 |
| DKC Electrical Services Limited | Construction | 2016 |
| DKP Property Management Limited | Real estate | 2024 |
| DLM Trans Ltd | Administrative & support | 2016 |
| DLW Property Management Limited | Construction | 2022 |
| DM Eurotrading Ltd | Transport & logistics | 2014 |
| DMC Corporate Consultants Limited | Administrative & support | 2003 |
| DMD Trans Ltd | Transport & logistics | 2023 |
| DMI Solutions Ltd | Administrative & support | 2008 |
| Dmjv Logistics Limited | Transport & logistics | 2025 |
| DMO Accountants Wellingborough Limited | Professional & scientific | 2011 |
| DMT (Northants) Limited | Construction | 2018 |
| DMT Nutrition Limited | Wholesale & retail | 2024 |
| DNP Education Limited | Public administration | 2026 |
| DNR Homes Property Ltd | Real estate | 2024 |
| DNS Excavations Ltd | Construction | 2026 |
| DNYG63 Ltd | Construction | 2026 |
| Dodo Drylining Ltd | Construction | 2025 |
| Dodson Plastering Services Limited | Construction | 2004 |
| Dogsthorpe Acquisitions Limited | Professional & scientific | 1935 |
| Doherty & Gooderham Surveying Services Ltd | Professional & scientific | 2025 |
| Dolce Mila Bakery Ltd | Wholesale & retail | 2024 |