| Daniel Hill Holdings Limited | Real estate | 2017 |
| Daniel Hill Investments Limited | Real estate | 2021 |
| Daniel Olaru Limited | Transport & logistics | 2015 |
| Danielle Toni LEE Ltd | Other services | 2026 |
| Danny Whitehead Roofing Limited | Construction | 2012 |
| Dannyz Pizza Ltd | Hospitality | 2019 |
| Danny’S Pizza & Grill Ltd | Hospitality | 2018 |
| Dardex Enterprises Limited | Administrative & support | 2023 |
| Darious Limited | Health & social care | 2025 |
| Dashsons Limited | Financial services | 2021 |
| Data Installations Limited | Construction | 2001 |
| Databasejase Limited | Information & communication | 2014 |
| Datablaze Ltd | Information & communication | 2024 |
| Datamapwave Limited | Information & communication | 2026 |
| Daveparker.Coach Ltd | Education | 2022 |
| Dave’S Special Sauce Ltd | Wholesale & retail | 2025 |
| David Bletsoe-Brown Limited | Transport & logistics | 1996 |
| David Byrne Driver Hire Limited | Transport & logistics | 2008 |
| David GEE Wills and Probate Ltd | Other services | 2021 |
| David Osgathorp.Com Ltd | Other services | 2012 |
| David Thomson Limited | Education | 2017 |
| Davies & Johnston Ltd | Real estate | 2017 |
| Davilar Ltd | Real estate | 2025 |
| Dawgz Construction Ltd. | Construction | 2022 |
| Dawson Builders Limited | Construction | 2008 |
| Days Homes LLP | | 2020 |
| DB Consultancy International Ltd | Real estate | 2020 |
| DB Equipment Hire Limited | Administrative & support | 2014 |
| DB Exports Textile Merchants Ltd | Transport & logistics | 2017 |
| DB Pool and Spa Services Limited | Administrative & support | 2024 |
| DB Textile Collections Ltd | Administrative & support | 2010 |
| DBE Management Limited | Transport & logistics | 2007 |
| DBX Scope Limited | Information & communication | 2025 |
| DC Mortgage Services Limited | Financial services | 2017 |
| DC Plumbing Services Ltd | Construction | 2020 |
| DC Utilities Ltd | Administrative & support | 2022 |
| Dcampden Consulting Limited | Professional & scientific | 2025 |
| DCB Logistics Limited | Transport & logistics | 2019 |
| Dcuk Plumbing and Drainage Limited | Construction | 2023 |
| DD Group Logistics Limited | Transport & logistics | 2026 |
| DDF Kettering Properties Ltd | Real estate | 2025 |
| DDW Developments (Northants) Ltd | Construction | 2019 |
| DE Wulf Developments (DWD) Ltd | Construction | 2021 |
| Dean Hayes Logistics Ltd | Transport & logistics | 2019 |
| Dean Jelley Air Conditioning Services Ltd | Construction | 2023 |
| Dean Underwood Plumbing & Heating Limited | Construction | 2006 |
| Debut Doors Limited | Manufacturing | 2003 |
| Decades in Kettering Ltd | Hospitality | 2019 |
| Deceased Online Limited | Information & communication | 2007 |
| Decipher Ltd | Professional & scientific | 2018 |
| Decontamination Respiratory Services Limited | Water & waste | 2003 |
| Dedicated Employment Services Limited | Administrative & support | 2004 |
| Deekev Technologies Ltd | Information & communication | 2021 |
| Deeside Cereals I DB Pension Ltd | Financial services | 1994 |
| Deeside Cereals I Ltd | Manufacturing | 1976 |
| Defensure Ltd | Administrative & support | 2017 |
| Define Hair and Beauty Ltd | Other services | 2022 |
| Define Services Ltd | Education | 2015 |
| Degu Office Services Limited | Administrative & support | 2021 |
| Deimkesta Limited | Transport & logistics | 2018 |
| Dejoos Investment Ltd | Real estate | 2026 |
| Delcris Transport Ltd | Transport & logistics | 2018 |
| Deltos Consulting UK Ltd | Information & communication | 2013 |
| Deluxe Driving Academy Ltd | Education | 2023 |
| Demeter Food Ltd | Hospitality | 2023 |
| Demuris Limited | Professional & scientific | 2007 |
| Denison Developments Limited | Construction | 2017 |
| Denny's Pizza and Grill Ltd | Hospitality | 2021 |
| Dental Systems Ltd | Wholesale & retail | 2021 |
| Dept. of Doing Limited | Administrative & support | 2014 |
| Dept. of Recruitment Limited | Administrative & support | 2016 |
| Derek Jones Bodywork (2005) Limited | Professional & scientific | 2005 |
| Derngate Advisory Services Ltd | Professional & scientific | 2011 |
| Derngate House Limited | Other services | 1995 |
| DES Minimarket Limited | Wholesale & retail | 2026 |
| Desborough Barber Ltd | Other services | 2021 |
| Desborough Development BA Limited | Construction | 2018 |
| Desborough Pizza Ltd | Hospitality | 2024 |
| Desford Renewable Energy Limited | Energy | 2010 |
| Design Print Management Limited | Manufacturing | 2010 |
| Design Reality Holdings Limited | Financial services | 2021 |
| Design Reality Limited | Professional & scientific | 2002 |
| Designed for Life Consultancy Ltd | Professional & scientific | 2025 |
| Designer Bytes Ltd | Administrative & support | 2015 |
| Designs for Education Limited | Professional & scientific | 2006 |
| Desired Designs NJ Morgan Ltd | Professional & scientific | 2014 |
| Destino Holdings Ltd | Real estate | 2018 |
| Detail Matters Limited | Professional & scientific | 2014 |
| Dethtech Holdings Ltd | Financial services | 2026 |
| Detype Limited | Professional & scientific | 2012 |
| Devereux House Limited | Professional & scientific | 2016 |
| Devil Transport Limited | Construction | 2015 |
| Devis Delights Ltd | Hospitality | 2024 |
| Dewanty Limited | Construction | 2025 |
| DFK Project Management Limited | Construction | 2024 |
| DG Designs 22 Ltd | Professional & scientific | 2025 |
| DG Timber Solutions Ltd | Manufacturing | 2011 |
| Dgpconsulting Limited | Professional & scientific | 2024 |
| Dhaliwal Estates Ltd | Real estate | 2012 |
| Dhillon Quest Ltd | Professional & scientific | 2024 |