| DMI Ltd | Professional & scientific | 2023 |
| DMJ Care Services Limited | Health & social care | 2022 |
| Dmje Healthcare Ltd | Health & social care | 2018 |
| DMK Plumbing Ltd | Construction | 2026 |
| Dmkd Brickwork Ltd | Construction | 2018 |
| Dmkd Building Services Ltd | Construction | 2024 |
| DMO Competitions Limited | Information & communication | 2023 |
| DMR Framing Ltd | Manufacturing | 2003 |
| DMR Management Ltd | Professional & scientific | 2022 |
| DMS Construction Services Ltd | Construction | 2020 |
| DMS Network Solutions Limited | Information & communication | 2003 |
| DMS4U (UK) Limited | Information & communication | 2004 |
| DMT Computing Ltd | Information & communication | 2018 |
| DN Tools Limited | Wholesale & retail | 2020 |
| DN Ventures Limited | Hospitality | 2017 |
| DNA Bridge Limited | Professional & scientific | 2015 |
| DNB Solutions Limited | Professional & scientific | 2023 |
| DNC Group Limited | Manufacturing | 2023 |
| DND Living Ltd | Professional & scientific | 2024 |
| DNE Consultants Ltd | Professional & scientific | 2026 |
| DNL Properties Ltd | Construction | 2019 |
| DNS (UK) PVT Ltd | Wholesale & retail | 2018 |
| DNS Info Ltd | Information & communication | 2019 |
| DNT Services Ltd | Other services | 2018 |
| DO Collective Living Ltd | Real estate | 2026 |
| DO IT for the Art Barbers Ltd | Other services | 2021 |
| DO7 Technology Solutions Limited | Information & communication | 2024 |
| Dobix Properties Ltd | Real estate | 2022 |
| Dobrad Ltd | Administrative & support | 2025 |
| Docobo Ltd | Health & social care | 2001 |
| Docplex Ltd | Information & communication | 2025 |
| DOCS2DIGITAL Limited | Administrative & support | 2008 |
| Doctors' Close Sandy Limited | Extraterritorial | 2020 |
| Doctran AI Ltd | Professional & scientific | 2023 |
| Document Control Services Ltd | Construction | 2025 |
| Document Logistix Limited | Information & communication | 2010 |
| Documinute Films Ltd | Information & communication | 2023 |
| Dodd & Co Educational Ventures Limited | Education | 2016 |
| Dodford Lettings Ltd | Real estate | 2021 |
| Dodprop Ltd | Real estate | 2019 |
| DOE & Fawn Coffee Ltd | Wholesale & retail | 2021 |
| Doehler I-Invest (UK) Limited | Real estate | 2014 |
| Doerr Group Limited | Administrative & support | 2018 |
| Doerr Wines Limited | Manufacturing | 2019 |
| Doerrs Limited | Administrative & support | 2023 |
| DOF Trader Ltd | Wholesale & retail | 2021 |
| Dog Centre Milton Keynes Ltd | Wholesale & retail | 2021 |
| Dogar Trans Ltd | Transport & logistics | 2016 |
| Doginblack Ltd | Manufacturing | 2019 |
| Dogs DO DAS Grooming Limited | Professional & scientific | 2023 |
| Doha Roastery Limited | Hospitality | 2025 |
| Dohler (UK) Limited | Wholesale & retail | 1995 |
| DOIT4THEART Ltd | Wholesale & retail | 2026 |
| Doitfortheart Limited | Other services | 2023 |
| Doitfortheart Studio Ltd | Other services | 2025 |
| Dojojuice Ltd | Wholesale & retail | 2025 |
| Dojoni Limited | Wholesale & retail | 2019 |
| DOK Logistics UK Ltd | Transport & logistics | 2020 |
| DOL ENG Limited | Other services | 2021 |
| Dolledbyabigail Ltd | Other services | 2025 |
| Dolphin Team Development Limited | Professional & scientific | 2016 |
| DOM Asset Management Client Account Limited | Real estate | 2017 |
| DOM Renovation and Design Ltd | Construction | 2024 |
| Dom's Touch Ltd | Information & communication | 2013 |
| Domavante Limited | Real estate | 2026 |
| Domcode Limited | Other services | 2000 |
| Dome Dynamics Ltd | Manufacturing | 2025 |
| Domestic Basic Support Limited | Construction | 2025 |
| Domestic Heat Cover Limited | Construction | 1997 |
| Domestic Heat Cover South Limited | Construction | 2014 |
| Domestic Heat Holdings Ltd | Financial services | 2025 |
| Dominant Ltd | Construction | 2015 |
| Dominic's Recovery Ltd | Wholesale & retail | 2025 |
| Dominion Bierrum Limited | Construction | 2003 |
| Dominion Circular Economy UK Limited | Professional & scientific | 2026 |
| Dominion Housing Ltd | Real estate | 2023 |
| Dominion Risk Solutions Limited | Financial services | 2017 |
| Domino's Pizza Group PLC | Hospitality | 1999 |
| Domino's Pizza UK & Ireland Limited | Other services | 1993 |
| Domino’S Partners Foundation UK & Ireland Limited | Other services | 2020 |
| Domitech Property Solutions Limited | Real estate | 2023 |
| Domus Invco Ltd | Financial services | 2024 |
| Domus Pacis - House of Peace Ltd | Real estate | 2026 |
| Domyway Co., Ltd | Extraterritorial | 2019 |
| DON Dadda Ltd | Wholesale & retail | 2018 |
| DON FIX Ltd | Administrative & support | 2018 |
| DON Giovanni Catering Ltd | Hospitality | 2024 |
| Don'T CUT Ltd | Information & communication | 2017 |
| Don'T Just SIT There, Sell Something! Limited | Administrative & support | 1999 |
| Donald Associates Limited | Professional & scientific | 2025 |
| Donard Consulting Ltd | Health & social care | 2009 |
| Done Proper Ltd | Administrative & support | 2026 |
| Doneck UK Ltd | Manufacturing | 2017 |
| Doner Maker Limited | Agriculture & fishing | 2019 |
| Donesa Ltd | Transport & logistics | 2022 |
| Donette Catering Services Ltd | Hospitality | 2023 |
| Doneway Developments Limited | Real estate | 2020 |
| Dong JUN LIU Ltd. | Wholesale & retail | 2025 |
| Doniel Bookerr Limited | Wholesale & retail | 2025 |
| Donmez Yapi Limited | Manufacturing | 2025 |