| D & K Carpets Limited | Other services | 2009 |
| D & L Accountancy Services Ltd | Extraterritorial | 2010 |
| D & S Scaffolding Limited | Construction | 2016 |
| D Barclay Properties Limited | Real estate | 2022 |
| D D Supplies Ltd | Wholesale & retail | 2020 |
| D Driver & SON Limited | Administrative & support | 2014 |
| D J Orrin Commissioning Services Limited | Energy | 2013 |
| D J Shepherd Limited | Other services | 2002 |
| D K Cars & Vans Ltd | Wholesale & retail | 2011 |
| D Kamel Holdings Limited | Financial services | 2015 |
| D L J Consultancy Limited | Professional & scientific | 2024 |
| D M Lindo Limited | Health & social care | 2015 |
| D R Farrow Developments Limited | Construction | 2019 |
| D R Metson & Partners LLP | | 2021 |
| D Radu Flooring Ltd | Construction | 2022 |
| D V Terry Limited | Health & social care | 2016 |
| D W Turner Limited | Construction | 2007 |
| D Willis Consultancy Limited | Professional & scientific | 2021 |
| D&Cc Ltd | Construction | 2017 |
| D&Dc Ltd | Construction | 2022 |
| D&G Henson Investments Limited | Real estate | 2023 |
| D&J Ventures Limited | Real estate | 2021 |
| D&M Beauty Studio Limited | Other services | 2025 |
| D'Eyncourt Consulting Limited | Professional & scientific | 2001 |
| D'S Access Solutions Ltd | Construction | 2018 |
| D-Tma Consulting Ltd | Information & communication | 2016 |
| D. Oliver Limited | Manufacturing | 2001 |
| D.A.W. Windows Limited | Construction | 2012 |
| D.Goodall Limited | Manufacturing | 2013 |
| D.J. Nurcombe Services Ltd | Wholesale & retail | 2008 |
| D.K.Finch Rail Ltd | Construction | 2016 |
| D.R. Bill & Sons Limited | Manufacturing | 2003 |
| D.W.Bear Plumbing and Heating Ltd | Construction | 2022 |
| D2A Property Limited | Real estate | 2021 |
| D3T Care Limited | Public administration | 2019 |
| D8TAMAX Services Ltd | Professional & scientific | 2017 |
| DA BIZ Ltd | Education | 2008 |
| DA Changeworks Limited | Professional & scientific | 2025 |
| DA Silva Consultancy Limited | Professional & scientific | 2013 |
| Da-Bels Services Limited | Administrative & support | 2019 |
| Daato Accounting Ltd | Professional & scientific | 2024 |
| Daato Bricks Limited | Real estate | 2015 |
| DAB Electrical Services Ltd | Construction | 2025 |
| Dabbous Films Ltd | Information & communication | 2018 |
| Dabby Dedolf Limited | Professional & scientific | 2019 |
| Dabec Property Limited | Real estate | 2020 |
| Dach Courier Services Ltd | Transport & logistics | 2026 |
| Dach Property Investments Ltd | Real estate | 2026 |
| Dache Merchandise Ltd | Wholesale & retail | 2021 |
| Dada Goose Estates Limited | Real estate | 2021 |
| Dadens Plumbing and Heating Limited | Construction | 2014 |
| Dafeboba Ltd | Transport & logistics | 2020 |
| Daferlin Limited | Administrative & support | 2019 |
| Daffwood (North Melbourne) Management Company Limited | Households | 1983 |
| DAG Catering Ltd | Hospitality | 2019 |
| Dagenham Business Centre Management Company Limited | Professional & scientific | 2011 |
| DAH Consultancy Limited | Transport & logistics | 2018 |
| Daily Mercies Limited | Wholesale & retail | 2020 |
| Dairy Court Management (SWF) Ltd | Households | 2008 |
| Daisy May's Farm Limited | Agriculture & fishing | 2016 |
| Daisy Studios Ltd | Arts & recreation | 2022 |
| Daisycalla Ltd | Administrative & support | 2026 |
| Dajohn Management Limited | Professional & scientific | 2021 |
| Dakota Partnerships Ltd | Professional & scientific | 2017 |
| Dakshaini Solutions Ltd | Information & communication | 2010 |
| Dale Contracts Ltd | Construction | 2019 |
| Dale Facade Ltd | Construction | 2019 |
| Dale J. West Consulting Ltd | Professional & scientific | 2019 |
| Dalgrewal Limited | Professional & scientific | 2017 |
| Dalzielsmith Media Ltd | Information & communication | 2019 |
| DAM IT Services Limited | Information & communication | 2019 |
| Damask Bouquet Ltd | Financial services | 2026 |
| Damd Ltd | Construction | 2014 |
| Damel Consultancy Ltd | Financial services | 2016 |
| Damic Services Limited | Information & communication | 2006 |
| Damito Services Limited Ltd | Information & communication | 2020 |
| Damorcare Ltd | Health & social care | 2013 |
| DAN B Invest Ltd | Real estate | 2023 |
| DAN Devine Ltd | Professional & scientific | 2024 |
| DAN Lawlor DC Services Ltd | Information & communication | 2021 |
| DAN Netting Limited | Administrative & support | 2020 |
| DAN Skeates Limited | Other services | 2015 |
| DAN Trading & Supply Ltd | Administrative & support | 2014 |
| Danai Consultancy Limited | Information & communication | 2012 |
| Danbury Bookkeeping Services Ltd | Professional & scientific | 2021 |
| Danbury Business Park Limited | Real estate | 2015 |
| Danbury BWM Limited | Financial services | 2020 |
| Danbury Decorating Contractors Limited | Wholesale & retail | 1978 |
| Danbury Dental Care Limited | Health & social care | 2008 |
| Danbury Dispensers Ltd | Wholesale & retail | 2023 |
| Danbury Dust Busters Ltd | Administrative & support | 2025 |
| Danbury Electrical Services Limited | Construction | 1977 |
| Danbury Fencing Ltd | Construction | 2013 |
| Danbury Plant Hire Limited | Administrative & support | 2013 |
| Danbury Pre-School | Education | 2005 |
| Danbury Rendering Solutions Limited | Construction | 2016 |
| Danbury Sales Company Limited | Professional & scientific | 2026 |
| Danbury SLT Limited | Health & social care | 2024 |
| Danbury SWA Ltd | Information & communication | 2022 |
| Dancing Pony Events Ltd | Wholesale & retail | 2024 |