| Dorset Bay LP | | 2015 |
| Dorset Union Ltd | Professional & scientific | 2014 |
| Dorset Waterways LP | | 2013 |
| Dorshield LP | | 2004 |
| Dorval Lighting Limited | Manufacturing | 1977 |
| Dorward James International LLP | | 2024 |
| Dosirock Ltd | Hospitality | 2023 |
| Doski Takeaway Ltd | Hospitality | 2025 |
| Dosteon Consult LP | | 2016 |
| DOT by DOT Care Ltd | Transport & logistics | 2020 |
| DOT Dash Holdings Ltd | Real estate | 2023 |
| DOT Direct Holdings LP | | 2018 |
| DOT Direct LP | | 2015 |
| DOT Surveying Corporate Trustee Limited | Financial services | 2023 |
| DOT Trans LP | | 2015 |
| Dot&Rhu Associates Limited | Information & communication | 2025 |
| Dotch Limited | Information & communication | 2024 |
| Dotcoach C.I.C. | Professional & scientific | 2015 |
| Dotha LP | | 2004 |
| Dots and Loops Limited | Information & communication | 2018 |
| Dottski Winter Holidays Ltd | Administrative & support | 2025 |
| Double Bits Ltd | Information & communication | 2026 |
| Double Eight Consulting Limited | Professional & scientific | 2021 |
| Double Lion Limited | Wholesale & retail | 2016 |
| Double Lotus Ltd | Administrative & support | 2017 |
| Double MAC Cabs Ltd. | Professional & scientific | 2002 |
| Double Quick Mortgages Limited | Financial services | 2003 |
| Double Take Projections Ltd | Information & communication | 2013 |
| Double Tapped Ltd | Hospitality | 2021 |
| Double Trade Holdings LP | | 2016 |
| Double Tree Trading Ltd | Hospitality | 2025 |
| Double Trouble Production LP | | 2016 |
| Double UP Ltd | Hospitality | 2014 |
| Double WIN LP | | 2014 |
| Doubledeep Ltd | Hospitality | 2019 |
| Doublewind Investments LP | | 2018 |
| Doug Cook Consultancy Limited | Administrative & support | 2019 |
| Doug Ross Ltd | Professional & scientific | 2012 |
| Dougal Cameron Limited | Professional & scientific | 1946 |
| Dougal Mcdougal Limited | Real estate | 2023 |
| Dough Express Limited | Hospitality | 2022 |
| Dough Productions UK Ltd | Information & communication | 2010 |
| Dough RE MI Limited | Manufacturing | 2004 |
| Doughlala Ltd | Hospitality | 2024 |
| Douglas and Angus Estates. | Agriculture & fishing | 1937 |
| Douglas Architecture Limited | Professional & scientific | 2016 |
| Douglas C Marr Engineering Ltd | Professional & scientific | 2012 |
| Douglas Energy LP | | 2015 |
| Douglas Lowe Foundation | Other services | 2025 |
| Douglas Mackenzie Limited | Extraterritorial | 2003 |
| Douglas Mackenzie Photography Ltd | Professional & scientific | 2022 |
| Douglas ORR & Company Limited | Agriculture & fishing | 1998 |
| Douglas Property Investments Ltd | Real estate | 2020 |
| Douglas Sales LP | | 2014 |
| Douglas Street Glasgow Limited | Administrative & support | 2023 |
| Douglas West Wind Farm Ltd | Energy | 2016 |
| Douglas-Hamilton (D Share) Limited | Real estate | 1987 |
| Douglas-Hamilton Enterprises | Administrative & support | 2008 |
| Douglaskaye IT Solutions Ltd | Information & communication | 2017 |
| Douglasline Estate LP | | 2013 |
| Dougray Holding LP | | 2016 |
| Dougray Limited | Real estate | 2025 |
| Doune Consulting Limited | Professional & scientific | 2014 |
| Doune Property Limited | Real estate | 2018 |
| Dourado Invest LP | | 2013 |
| Dourtex Trading LP | | 2015 |
| Dovastra Capital LP | | 2013 |
| Dovatone Resources LP | | 2013 |
| Dovebrook Trading L.P. | | 2010 |
| Dovecot Homes Ltd | Real estate | 2024 |
| Dovecot Properties Limited | Extraterritorial | 2006 |
| Dovecot Studios Limited | Manufacturing | 2001 |
| Dovelight by the Sea Limited | Health & social care | 2017 |
| Dovelight Ltd | Health & social care | 2013 |
| Dovemont Limited | Wholesale & retail | 2025 |
| Doveport Services Limited | Administrative & support | 2024 |
| Dover Corporation LP | | 2018 |
| Dover Fueling Solutions UK Limited | Manufacturing | 1975 |
| Dover Group L.P. | | 2009 |
| Dover Street IX AIF L.P. | | 2015 |
| Dovetail Games (Scotland) Limited | Information & communication | 2013 |
| Dovetail Renovations Limited | Construction | 2023 |
| DOW Drug Development Solutions Limited | Professional & scientific | 2020 |
| Down the Stairs Ltd | Real estate | 2024 |
| Downberg L.P. | | 2012 |
| Downboard L.P. | | 2015 |
| Downes Opticians Limited | Wholesale & retail | 2018 |
| Downhole Products Limited | Mining & quarrying | 1993 |
| Downhole Products UK Holdco II Limited | Professional & scientific | 2008 |
| Downhole Products UK Holdco Limited | Professional & scientific | 2008 |
| Downmount LP | | 2014 |
| Downtown Distribution Capital LP | | 2018 |
| Downtown Distribution Holding LP | | 2018 |
| Downtown Distribution L.P. | | 2012 |
| Downtown Holding LP | | 2025 |
| Downtown Imports/Exports L.P. | | 2012 |
| Downtown Partnership L.P. | | 2010 |
| Doxa Property Group Ltd | Real estate | 2025 |
| Doyen Consulting Ltd | Information & communication | 2021 |
| Doyle Property Developments Ltd | Financial services | 2025 |