| Dalness Consulting Limited | Professional & scientific | 2015 |
| Dalness Estates (Charlotte Street) Ltd | Real estate | 2017 |
| Dalness Estates Limited | Real estate | 2014 |
| Dalness Holdings Ltd | Financial services | 2022 |
| Dalness Limited | Real estate | 2014 |
| Damer House Limited | Real estate | 2016 |
| Damson Services Ltd | Administrative & support | 2026 |
| Dance Dynamics Limited | Education | 2026 |
| Dance Yourself Dizzy Limited | Arts & recreation | 2011 |
| Dancing Otter Productions Ltd | Information & communication | 2024 |
| Dando Trading Ltd | Financial services | 2025 |
| Danebury Vineyards Limited | Manufacturing | 1993 |
| Daneswood Holdings Limited | Financial services | 2022 |
| Daneswood Properties Limited | Real estate | 1939 |
| Daniel J Biggle Limited | Professional & scientific | 2012 |
| Darbel Limited | Information & communication | 2024 |
| Darcys Garage Limited | Extraterritorial | 2012 |
| Dare to Dream Prints Ltd | Manufacturing | 2022 |
| Dart Freelance Writing Services Limited | Professional & scientific | 2023 |
| Dartisan Technology Ltd | Information & communication | 2025 |
| DAS New Limited | Financial services | 2023 |
| Data Discovery Solutions EBT Limited | Professional & scientific | 2019 |
| Data Discovery Solutions Ltd | Information & communication | 2008 |
| Datacourse Limited | Information & communication | 2000 |
| Dave Tullett Consulting Ltd | Professional & scientific | 2016 |
| Daveco Limited | Hospitality | 2024 |
| David Finch + Partners Ltd | Administrative & support | 2018 |
| David HOU Limited | Health & social care | 2014 |
| David Store Navigational Management Limited | Administrative & support | 2017 |
| Davies Keen Property Ltd | Real estate | 2024 |
| Davis Hair & Beauty Limited | Other services | 2002 |
| Davys Court Management Limited | Households | 1990 |
| Dawnriver Property Management Limited | Construction | 1983 |
| DB Risk Engineering Limited | Financial services | 2015 |
| DBI UK Services Ltd | Construction | 2017 |
| DC Creative Consulting Ltd | Professional & scientific | 2019 |
| DC Data Communications Limited | Information & communication | 2014 |
| DCA Wheels Limited | Wholesale & retail | 2025 |
| DCS Farming Limited | Professional & scientific | 2016 |
| DCU Ltd | Construction | 2017 |
| DE Wolff Solutions Ltd | Construction | 2021 |
| Deakin Howell Ltd | Construction | 2026 |
| Dean Lane (Winchester) Limited | Construction | 2018 |
| Deanegate Homes Ltd | Construction | 2017 |
| Death OR Glory Design Limited | Professional & scientific | 2013 |
| Debbie Ingham Associates Limited | Professional & scientific | 2015 |
| Decarboneaser Limited | Education | 2025 |
| Decision Data Ltd | Information & communication | 2023 |
| Decorating Services | | 1995 |
| Deep Blue Learning Ltd | Professional & scientific | 2025 |
| Deepchange Project Ltd | Professional & scientific | 2017 |
| Deeper Intuition Limited | Financial services | 2020 |
| Deepview Robotics Ltd | Professional & scientific | 2026 |
| Deepwater Marine Services Ltd | Construction | 2025 |
| Defined Management Limited | Real estate | 2017 |
| Dehn and Maibaum Limited | Administrative & support | 2003 |
| Delgado Tennis Schools Limited | Education | 2022 |
| Dell House Development Ltd | Construction | 2025 |
| Delos Ltd. | Wholesale & retail | 1977 |
| Demontre Limited | Real estate | 2022 |
| Denham Court (Winchester) Management Company Limited | Households | 1982 |
| Denise Nathan Consultancy Limited | Professional & scientific | 2003 |
| Denley King International Limited | Construction | 2003 |
| Dental Arch Nurse Training Limited | Education | 2013 |
| Denton Tyre Centre Limited | Extraterritorial | 1998 |
| Depth Engineering Solutions Ltd | Professional & scientific | 2023 |
| Derwent Hillside Limited | Real estate | 2018 |
| Desertbreeze Limited | Other services | 2020 |
| Design & Thrive Ltd | Other services | 2017 |
| Design 16 Limited | Professional & scientific | 2011 |
| Design Collective Studio Ltd | Professional & scientific | 2021 |
| Design Engine Architects Limited | Professional & scientific | 2001 |
| Design Engine EOT Limited | Administrative & support | 2022 |
| Design House International Limited | Manufacturing | 2003 |
| Design POD (Winchester) Ltd | Manufacturing | 2020 |
| Design Then Build Ltd | Construction | 2018 |
| Designed by Alice Ltd | Extraterritorial | 2022 |
| Designs for Lighting 2020 Limited | Professional & scientific | 2018 |
| Designs for Lighting Ltd | Professional & scientific | 2000 |
| Desire Dream Vision Estates Limited | Real estate | 2023 |
| Desire Dream Vision Limited | Administrative & support | 2017 |
| Desire Dream Vision Productions Limited | Administrative & support | 2016 |
| Destination Solutions Limited | Administrative & support | 2010 |
| DET3 Security Services Ltd | Administrative & support | 2020 |
| Deventer Limited | Manufacturing | 1985 |
| Dever Fencing Ltd | Construction | 2014 |
| Dever Springs Limited | Agriculture & fishing | 1968 |
| Dever Valley Produce Limited | Extraterritorial | 2010 |
| Devstorm Ltd | Information & communication | 2022 |
| Dewgosling Ltd | Professional & scientific | 2017 |
| DF Apex Limited | Wholesale & retail | 2024 |
| DFE Partners Limited | Financial services | 2008 |
| Dfl-Uk Ltd | Professional & scientific | 2021 |
| DG 251 Limited | Wholesale & retail | 2009 |
| DG Calculators Limited | Information & communication | 2026 |
| DG Security Consultancy Ltd | Administrative & support | 2018 |
| DGL Properties Ltd | Real estate | 2019 |
| Diamond Business Consulting Limited | Construction | 2008 |
| Diamond Education Partners Ltd | Education | 2011 |
| Diamond Property Holdings Limited | Construction | 1989 |