| DMP Healthcare (Grays) Ltd | Real estate | 2021 |
| DMP Healthcare (Heatherbrook) Ltd | Health & social care | 2019 |
| DMP Healthcare (Hill House) Ltd | Health & social care | 2025 |
| DMP Healthcare (Holdings) 2 Ltd | Real estate | 2024 |
| DMP Healthcare (Holdings) 3 Ltd | Construction | 2025 |
| DMP Healthcare (Holdings) Ltd | Financial services | 2017 |
| DMP Healthcare (Ogilvy) Limited | Health & social care | 2021 |
| DMP Healthcare (Romford) Ltd | Real estate | 2019 |
| DMP Healthcare (Wembley) Limited | Real estate | 2021 |
| DMP Traders Ltd | Administrative & support | 2025 |
| DMR Enterprises Limited | Wholesale & retail | 2012 |
| DMR Plastering Ltd | Construction | 2021 |
| Dmrc Technologies Ltd | Information & communication | 2018 |
| DMS Invest Limited | Real estate | 2024 |
| DMT Concepts Limited | Manufacturing | 2022 |
| DMT Developments Limited | Construction | 2003 |
| DMT Scenery Limited | Construction | 2018 |
| DMV Housing Ltd | Real estate | 2023 |
| DMZ Electrical Ltd | Construction | 2019 |
| DN Bargains Ltd | Wholesale & retail | 2025 |
| DN Orthopaedics Limited | Health & social care | 2013 |
| DNA Health Ltd | Health & social care | 2025 |
| DNA London Limited | Hospitality | 2013 |
| DNA Pictures Limited | Information & communication | 2018 |
| DNA Propco Holdings Limited | Real estate | 2024 |
| DNA Propco Limited | Information & communication | 2023 |
| DNA UK Construction Ltd | Construction | 2018 |
| Dnad Services Ltd | Transport & logistics | 2025 |
| DNB Enterprise Ltd | Administrative & support | 2024 |
| DNB Shack Ltd | Information & communication | 2023 |
| Dnba Entertainment Ltd | Wholesale & retail | 2018 |
| Dnba Events UK Ltd | Hospitality | 2020 |
| DNF Properties Ltd | Real estate | 2023 |
| DNK Foods Limited | Hospitality | 2025 |
| DNL Welding Services Limited | Construction | 2015 |
| DNM Doctor Limited | Health & social care | 2026 |
| DNM Food and Wine Limited | Wholesale & retail | 2024 |
| DNR Developments Limited | Real estate | 2016 |
| DNR Law Limited | Professional & scientific | 2019 |
| Dnrb Properties Limited | Real estate | 2020 |
| DNS Accountants (Pinksalt) Ltd | Professional & scientific | 2019 |
| DNS Accountants Ltd | Professional & scientific | 2019 |
| DNS Cargo Ltd | Transport & logistics | 2019 |
| DNS Cloudco Ltd | Professional & scientific | 2022 |
| DNS Financial Services Ltd | Financial services | 2017 |
| Dns's Test Ltd | Agriculture & fishing | 2024 |
| DNV Partners Ltd | Financial services | 2025 |
| Dnvb Limited | Wholesale & retail | 2023 |
| Dnyce Empowerher Ltd | Health & social care | 2025 |
| DO Design Studio Limited | Professional & scientific | 2010 |
| DO Well DO Good Limited | Professional & scientific | 2016 |
| Do:Something Ltd | Professional & scientific | 1999 |
| Doaba Developments Limited | Construction | 2024 |
| Doaba Estates Limited | Financial services | 2024 |
| Dobs Security Services Ltd | Administrative & support | 2019 |
| DOC2DOC Communications Limited | Manufacturing | 2016 |
| DOC2UK Ltd | Administrative & support | 2017 |
| Doca Construction Ltd | Construction | 2019 |
| Docanon Ltd | Other services | 2024 |
| Dock and LET Limited | Construction | 1999 |
| Docsol Ltd | Administrative & support | 2012 |
| Doctor Azmain Ltd | Professional & scientific | 2025 |
| Doctor Device Limited | Other services | 2017 |
| Doctor Feelgood Ltd | Health & social care | 2022 |
| Doctor Kate Limited | Health & social care | 2021 |
| Doctor Locum Suppliers Limited | Health & social care | 2013 |
| Doctor Smita Limited | Health & social care | 2015 |
| Doculaw Limited | Other services | 2026 |
| Documents Cabinet Limited | Information & communication | 2019 |
| Documents Translation Company Limited | Professional & scientific | 2015 |
| Docuz Ltd. | Hospitality | 2016 |
| Dodeja Limited | Professional & scientific | 2025 |
| Dodo CK Ltd | Construction | 2026 |
| Dods Property Ltd | Real estate | 2020 |
| Doherty Housing Management Limited | Real estate | 2024 |
| DOI Prieteni Ltd | Hospitality | 2020 |
| Dolatpro Ltd | Wholesale & retail | 2025 |
| Doli Bridal London Ltd | Wholesale & retail | 2019 |
| Doli London Ltd | Wholesale & retail | 2019 |
| Doli Ltd | Wholesale & retail | 2019 |
| Dolphin High Wycombe Limited | Hospitality | 2019 |
| Domaines & Terroirs Limited | Administrative & support | 2009 |
| DOMCARE24 Ltd | Health & social care | 2021 |
| Dome Antiques (Exports) Limited | Real estate | 1978 |
| Dome Management Limited | Financial services | 2009 |
| Domestic Installations LDN Limited | Construction | 2022 |
| Domesticus Ltd | Hospitality | 2018 |
| DOMI247SERVICES Limited | Water & waste | 2025 |
| Dominic Finch Limited | Transport & logistics | 2018 |
| Dominico & Co Ltd | Construction | 2021 |
| Dominion Enterprises Limited | Professional & scientific | 2025 |
| Dominique Catherine Design Limited | Professional & scientific | 2016 |
| Dominoes House Limited | Real estate | 2023 |
| Domkraft Ltd | Construction | 2025 |
| Doms Group Ltd | Wholesale & retail | 2018 |
| Domsol Limited | Construction | 2014 |
| Domus Aeterna Ltd | Real estate | 2025 |
| Domus Aurea London Ltd | Administrative & support | 2017 |
| Domus Property Maintenance Ltd | Construction | 2016 |
| DON Tucker Limited | Wholesale & retail | 2002 |