| Diwm Ltd | Extraterritorial | 2016 |
| Dixon Portfolio Limited | Real estate | 2016 |
| DJ Itch Ltd | Arts & recreation | 2023 |
| DJB Brickwork & Building Ltd | Construction | 2022 |
| DJB Properties Kent Limited | Real estate | 2025 |
| DJI Engineering Ltd | Extraterritorial | 2014 |
| DJJ Construction Services Limited | Construction | 2024 |
| DJL Labour Ltd | Construction | 2024 |
| DJP Engineering Excellence Ltd | Professional & scientific | 2024 |
| DJS Autos Limited | Wholesale & retail | 2025 |
| DJV Holdings Limited | Financial services | 2017 |
| DK Living Limited | Real estate | 2020 |
| DK London Limited | Professional & scientific | 2002 |
| DK Manandvan Ltd | Transport & logistics | 2022 |
| DK Yakkha Limbu Limited | Transport & logistics | 2025 |
| Dk(Uk) Transportation Ltd | Transport & logistics | 2025 |
| DKC Group Limited | Construction | 2023 |
| DKC Utilities Ltd | Construction | 2025 |
| DKD-3 Consultancy UK Ltd | Professional & scientific | 2019 |
| Dkec Properties Limited | Extraterritorial | 2025 |
| DKF Heating Limited | Construction | 2015 |
| DLB Property Company Ltd | Real estate | 2016 |
| DLG17 Ltd | Hospitality | 2026 |
| DLN Capital Limited | Professional & scientific | 2022 |
| DLP Fire Consultancy Limited | Professional & scientific | 2016 |
| DMA Investments Ltd | Real estate | 2019 |
| DMB Environmental Services Limited | Water & waste | 2023 |
| DMC Services (Essex) Limited | Construction | 2017 |
| DMD Joinery & Building Limited | Construction | 2012 |
| DMH Rail Services Ltd | Construction | 2019 |
| DMI Productions Limited | Information & communication | 2000 |
| DML Building Services Ltd | Construction | 2026 |
| DML Media Limited | Information & communication | 2023 |
| Dmmax Ltd | Professional & scientific | 2023 |
| DMO Sports Cars Ltd | Manufacturing | 2026 |
| DMS Kent Ltd | Construction | 2026 |
| Dmsm Jordan Construction Ltd | Construction | 2021 |
| DNA Audio Visual Limited | Information & communication | 2024 |
| DNM 347 Ltd | Wholesale & retail | 2025 |
| DNS Property Management Ltd | Real estate | 2019 |
| Dobbin and Major Property Ltd | Real estate | 2023 |
| Docazim Ltd | Information & communication | 2019 |
| Docreddy Limited | Health & social care | 2014 |
| Dodd Catering Limited | Hospitality | 2024 |
| Dodia Real Estate Limited | Real estate | 2018 |
| Dodia Transport Services Limited | Transport & logistics | 2023 |
| Dog Communication Limited | Professional & scientific | 2026 |
| Dohkahn Ltd | Wholesale & retail | 2025 |
| Dolan Linc Limited | Transport & logistics | 2015 |
| Dolcella Global Ltd | Health & social care | 2018 |
| Dolly's Windows Ltd | Manufacturing | 2025 |
| Dolmen Conservation & Joinery Ltd | Manufacturing | 2018 |
| Dolphin Lifts Kent Limited | Manufacturing | 2001 |
| Dome Media Ltd | Professional & scientific | 2024 |
| Domestic Heating and Plumbing Services Ltd | Construction | 2024 |
| Dominion Merchant Express Ltd | Financial services | 2025 |
| Domo Studio Limited | Information & communication | 2014 |
| Domsir Ltd | Real estate | 2026 |
| DON Barclay Creative Communication Ltd | Professional & scientific | 2019 |
| DON Juan Canterbury Limited | Hospitality | 2015 |
| Donald & Fuller Developments Limited | Construction | 2021 |
| Donald Carpentry & Construction Ltd | Construction | 2018 |
| Donegal Plant Hire Limited | Construction | 2015 |
| Donsam Limited | Health & social care | 2024 |
| Dontev Hairdressing Limited | Other services | 2013 |
| Donzie Ltd. | Information & communication | 2024 |
| Doora Building Services Limited | Professional & scientific | 2024 |
| Doora Property Ltd | Real estate | 2024 |
| DORA4BEAUTY Ltd | Wholesale & retail | 2022 |
| Doris Mcfogarty Limited | Wholesale & retail | 2016 |
| Doris Nails & Beauty Ltd | Other services | 2022 |
| Dormestone Consulting Limited | Professional & scientific | 2023 |
| Dostanaevents Ltd | Other services | 2025 |
| Doswell Law Solicitors Limited | Professional & scientific | 2017 |
| DOT Matrix 2 LLP | | 2017 |
| DOT Matrix Group Limited | Professional & scientific | 2016 |
| DOT Matrix LLP | | 2016 |
| Dotile Ltd | Construction | 2022 |
| Dotom Limited | Construction | 2016 |
| Double AA Group Limited | Wholesale & retail | 2025 |
| Doublej Projects Limited | Other services | 2016 |
| Douglas Tarrant Consultants Ltd | Professional & scientific | 2016 |
| Dovetail Design Limited | Professional & scientific | 2018 |
| Dovetail Ventures Ltd | Real estate | 2014 |
| Dowle Security Systems Limited | Construction | 2025 |
| Down to Earth Property Services Ltd | Administrative & support | 2024 |
| Downfast Demolition & Salvage Limited | Administrative & support | 2006 |
| Downfast Limited | Extraterritorial | 2009 |
| DOZ4CARE Ltd | Health & social care | 2023 |
| DP Aesthetics Ltd | Other services | 2020 |
| DP Property Group Ltd | Real estate | 2026 |
| DPD Construction Ltd | Construction | 2016 |
| DPE Global Ltd | Professional & scientific | 2018 |
| DPJ Elevate Ltd | Wholesale & retail | 2024 |
| Dpmc Limited | Professional & scientific | 2005 |
| Dpmortgageadvice Ltd | Financial services | 2019 |
| DPN Sales Ltd | Wholesale & retail | 2023 |
| DPO on Demand Ltd | Professional & scientific | 2023 |
| DPS Family Office Limited | Financial services | 2024 |
| DPS Landscaping & Driveways Ltd | Administrative & support | 2026 |