| Dolphin Court (Chigwell) Limited | Households | 1983 |
| DOM4YOU Ltd | Real estate | 2025 |
| Domain Marketing Ltd | Wholesale & retail | 2026 |
| Domain Pizza Ltd | Hospitality | 2019 |
| Doman Real Estate Ltd | Real estate | 2020 |
| Domenco Construction Ltd | Construction | 2024 |
| Domestic & Commercial Solutions Ltd | Construction | 2025 |
| Domestic Appliance Centre Ltd | Wholesale & retail | 2026 |
| Domino Sales Limited | Wholesale & retail | 2024 |
| Dominographics Limited | Arts & recreation | 2014 |
| Domis Solutions Ltd | Professional & scientific | 2024 |
| Domistics Services Ltd | Health & social care | 2025 |
| Domlag Limited | Construction | 2020 |
| Domtree Limited | Information & communication | 2025 |
| Domum Care Limited | Health & social care | 2019 |
| Domum Property Management Limited | Real estate | 2023 |
| DON Luciano Ltd | Transport & logistics | 2017 |
| DON Motorsport Ltd | Wholesale & retail | 2021 |
| Donamit Limited | Hospitality | 2011 |
| Donas Drive Limited | Transport & logistics | 2025 |
| Doner Base UK Ltd | Hospitality | 2021 |
| Doner K1 Corporation Ltd | Hospitality | 2020 |
| Donesol Technologies Ltd | Information & communication | 2025 |
| Dongguan YI HUI KUA Jing Dian Shang Co., Ltd | Wholesale & retail | 2025 |
| Donington Limited | Wholesale & retail | 2025 |
| Donnybakes Limited | Hospitality | 2026 |
| Donshele Group Limited | Health & social care | 2020 |
| Doohan & Co Ltd | Financial services | 2011 |
| Door 2 Door Maintenance Ltd | Construction | 2024 |
| Door Genius Ltd | Construction | 2023 |
| Door Supplies Ltd | Wholesale & retail | 2024 |
| Door to Door Cargos Services Ltd | Transport & logistics | 2024 |
| Doorap Ltd | Information & communication | 2024 |
| Doorcheck Ltd | Construction | 2011 |
| Doordoc Limited | Information & communication | 2025 |
| Doors and Windows Experts Ltd | Wholesale & retail | 2025 |
| Doorstepbag Ltd | Wholesale & retail | 2022 |
| Dor-Fix Ltd | Construction | 2023 |
| Doreen Developments Limited | Real estate | 2024 |
| Dorel Transport Logistics Ltd | Transport & logistics | 2026 |
| Dorian Construction Limited | Construction | 2015 |
| Dorji Ltd | Wholesale & retail | 2025 |
| Dosanjh Aura Ltd | Wholesale & retail | 2026 |
| DOT Drips Limited | Wholesale & retail | 2025 |
| DOT Goods Limited | Wholesale & retail | 2025 |
| Dotcom Properties Limited | Real estate | 2016 |
| Dotcom Solicitors Limited | Professional & scientific | 2012 |
| Dotn Ltd | Real estate | 2015 |
| Dotnet Consultancy London Ltd | Information & communication | 2011 |
| Double & Q Ltd | Hospitality | 2019 |
| Double 6 One Ltd | Administrative & support | 2021 |
| Doubles Holding Limited | Real estate | 2019 |
| Doublestar Tyres Ltd | Wholesale & retail | 2018 |
| Doublewoo Ltd | Wholesale & retail | 2025 |
| Douceure Furniture Ltd | Wholesale & retail | 2025 |
| Dougall Estate Limited | Real estate | 2026 |
| Dougall Farringdon Limited | Wholesale & retail | 2025 |
| Dougall Group Limited | Wholesale & retail | 2021 |
| Dougall OFF Licence Limited | Wholesale & retail | 2003 |
| Dougall Properties Limited | Real estate | 2022 |
| Dougall White City Limited | Wholesale & retail | 2025 |
| Dougalls One Stop Limited | Wholesale & retail | 2017 |
| Doval Ltd | Construction | 2025 |
| Dovedale Developers Limited | Construction | 2017 |
| Dovercrt Properties Limited | Real estate | 2025 |
| Dovydas & R Ltd | Wholesale & retail | 2012 |
| Dowel Design Ltd | Construction | 2021 |
| Downshall Court Management Company Limited | Households | 1991 |
| Doyle Shipping Group UK Unlimited | Transport & logistics | 2020 |
| Dozza Limited | Hospitality | 2020 |
| DP Drywall Services Ltd | Construction | 2019 |
| DP Global Education Limited | Professional & scientific | 2024 |
| DP London Homes Ltd | Real estate | 2023 |
| DP Properties Management Ltd | Real estate | 2025 |
| DPB Global Limited | Hospitality | 2018 |
| DPK Limited | Hospitality | 2000 |
| Dpkbv Limited | Wholesale & retail | 2003 |
| DPP & SON Ltd | Construction | 2018 |
| DPR Global Trade Ltd | Wholesale & retail | 2013 |
| DR Amba Clinic Ltd | Other services | 2024 |
| DR Anoushka Luthra Ltd | Health & social care | 2021 |
| DR Auto Services Limited | Manufacturing | 2012 |
| DR Carpentry Construct Limited | Construction | 2017 |
| DR GAS Limited | Energy | 2018 |
| DR Groundworks (Kent) Limited | Construction | 2021 |
| DR Irfan Waris Ltd | Wholesale & retail | 2025 |
| DR Khan and Associates Ltd | Health & social care | 2026 |
| DR M a Mohamed Ltd | Health & social care | 2022 |
| DR Mustafa Aesthetics Ltd | Manufacturing | 2023 |
| DR Q UK Limited | Real estate | 2011 |
| DR R B Sani Ltd | Health & social care | 2015 |
| DR Shah Islam Limited | Health & social care | 2020 |
| DR Techmist Ltd | Wholesale & retail | 2025 |
| DR Today Limited | Health & social care | 2013 |
| DR. Carpet Cleaning Ltd | Real estate | 2023 |
| DR. Tanzeel Aesthetics Ltd | Health & social care | 2020 |
| Dr.Nadia'Sdotandsons Ltd | Education | 2023 |
| DRA Associates Ltd | Administrative & support | 2018 |
| Dragnick Ltd | Transport & logistics | 2021 |
| Dragon Bicycle Limited | Wholesale & retail | 2026 |